GLAS Altimetry Data Dictionary
| Updated |
Reason |
| October 2006 |
Release-28 |
| March 2006 |
Release-26 |
| December 2005 |
Release-24 |
| July 2005 |
Release-22 |
Product Var Name: I_AvgRuf
Is element of: GLA13 Record
Short Description: Avg Roughness
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: cm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 12000
Description: The surface roughness of the entire footprint calculated
from the RMS width of the entire waveform.
Comments:
Product Var Name: i1_pred_lat
Is element of: GLA01 Main Record
Short Description: Predicted geodetic Latitude of the laser footprint
Product Data Type: i4b
Total Bytes: 4
Product Units: microdegrees
Invalid Value/Flag: gi_invalid_i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -90000000
Product Maximum: 90000000
Description: The geodetic Latitude of the laser footprint; obtained
from the predicted orbit; assuming the laser is nadir pointing.
Comments:
Product Var Name: i1_pred_lon
Is element of: GLA01 Main Record
Short Description: Predicted geodetic Longitude of the laser footprint
Product Data Type: i4b
Total Bytes: 4
Product Units: microdegrees
Invalid Value/Flag: gi_invalid_i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 360000000
Description: The geodetic Longitude of the laser footprint; obtained
from the predicted orbit; assuming the laser is nadir pointing.
Comments:
Product Var Name: i_4nsBgMean
Is element of: GLA01 Long Waveform Record
Short Description: Background Mean Value
Product Data Type: i2b (8)
Total Bytes: 16
Product Units: .01 counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: Yes
Product Minimum: 0
Product Maximum: 51200
Description: Background Noise Mean Value for the 4 ns filter. From
APID12/13, Offset 112.
Comments:
Product Var Name: i_4nsBgMean
Is element of: GLA01_Short_Record
Short Description: Background Mean Value
Product Data Type: i2b (20)
Total Bytes: 40
Product Units: .01 counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: Yes
Product Minimum: 0
Product Maximum: 51200
Description: Background Noise Mean Value for the 4 ns filter. From
APID12/13, Offset 112.
Comments:
Product Var Name: i_4nsBgSDEV
Is element of: GLA01_Short_Record
Short Description: Background Standard Deviation
Product Data Type: i2b (20)
Total Bytes: 40
Product Units: .01 counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: Yes
Product Minimum: 0
Product Maximum: 51200
Description: The standard deviation of the background noise for
the 4 ns filter. From APID12/13, Offset 116
Comments:
Product Var Name: i_4nsBgSDEV
Is element of: GLA01 Long Waveform Record
Short Description: Background Standard Deviation
Product Data Type: i2b (8)
Total Bytes: 16
Product Units: .01 counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: Yes
Product Minimum: 0
Product Maximum: 51200
Description: The standard deviation of the background noise for
the 4 ns filter. From APID12/13, Offset 116.
Comments:
Product Var Name: i_4nsPeakVal
Is element of: GLA01_Short_Record
Short Description: 4ns Filter Peak Value
Product Data Type: i2b (20)
Total Bytes: 40
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: No
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description: Received pulse Peak value for the 4ns filter; returned
by the FIR engine. From APID12/13, Offset 92.
Comments:
Product Var Name: i_4nsPeakVal
Is element of: GLA01 Long Waveform Record
Short Description: 4ns Filter Peak value
Product Data Type: i2b ( 8)
Total Bytes: 16
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: No
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description: Received pulse Peak value for the 4ns filter; returned
by the FIR engine. From APID12/13, Offset 92.
Comments:
Product Var Name: i_8nsPeakVal
Is element of: GLA01_Short_Record
Short Description: 8ns Filter Peak Value
Product Data Type: i2b (20)
Total Bytes: 40
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: No
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description: Received pulse Peak value for the 8ns filter; returned
by the FIR engine. From APID12/13, Offset 94.
Comments:
Product Var Name: i_8nsPeakVal
Is element of: GLA01 Long Waveform Record
Short Description: 8ns Filter Peak value
Product Data Type: i2b (8)
Total Bytes: 16
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description: Received pulse Peak value for the 8ns filter; returned
by the FIR engine. From APID12/13, Offset 94.
Comments:
Product Var Name: i_ADBias
Is element of: GLA01 Main Record
Short Description: Altimeter Digitizer Bias
Product Data Type: i4b (2)
Total Bytes: 8
Product Units: Meters
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -1000000
Product Maximum: 1000000
Description: Altimeter Digitizer bias values added to minimum and
maximum range: 1st item is bias for minimum range (Rbmin) - default
= 0; 2nd item is bias for maximum range (Rbmax) - default = 0. Used
when necessary to correct for off-nadir pointing angles greater
than 1 degree. From APID19, Offset 1124.
Comments:
Product Var Name: i_ADdetOutGn
Is element of: GLA01 Main Record
Short Description: Transmitted Gain
Product Data Type: i2b
Total Bytes: 2
Product Units: counts
Invalid Value/Flag: N/A
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description:
Comments: This is only updated every 4 seconds.
Product Var Name: i_APID_AvFlg
Is element of: GLA01 Main Record , GLA05 record, GLA06 record, GLA12
Record, GLA13 Record, GLA14 Record, GLA15 Record
Short Description: APID Data Availability Flag
Product Data Type: i1b (8)
Total Bytes: 8
Product Units: n/a
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -127
Product Maximum: 127
Description: Flag indicating which packets (APIDs) for each second
are available missing, or filled. APID 19 is broken down further
into Altimeter Digitizer, Photon Counter, Cloud Digitizer, GPS/DEM,
and C&T sections. View byte description.
Comments:
Product Var Name: i_AttFlg1
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Attitude Flag 1
Product Data Type: i2b
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32767
Description: At 1/sec denotes large off-nadir angle, ocn sweep,
target of opportunity, steering to reference track. View
byte description.
Comments:
Product Var Name: i_AttFlg2
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Attitude Flag 2
Product Data Type: i1b (20)
Total Bytes: 20
Product Units: NA
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 15
Description: Denotes at 40/sec rate whether precision attitude was
used to determine spot location, and if problems with LPA, etc. View
byte description.
Comments:
Product Var Name: i_Azimuth
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Local Azimuth
Product Data Type: i4b
Total Bytes: 4
Product Units: millideg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 360000
Description: Azimuth of the footprint path.
Comments:
Product Var Name: i_BergElev
Is element of: GLA13 Record
Short Description: Iceberg Elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 200000
Description: For waveforms with more than 1 peak, 'iceberg' elevation
is calculated using the difference between the range offset of the
maximum amplitude peak and the range offset of the first peak. Computations
are made after atmospheric and tide corrections have been applied.
The elevation computed is relative to the ellipsoid.
Comments: Users should be wary that this parameter is computed for
all multiple-peak GLA13 records, even if the elevation is too high
to be sea-ice.
Product Var Name: i_CorrStatFlg
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Correction Status Flag
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: NA
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32767
Description: For each geophysical correction that has multiple values
denotes which algorithm or model was used. View
byte description.
Comments:
Product Var Name: i_DEM_elv
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record, GLA15 Record
Short Description: DEM Elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: cm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -50000
Product Maximum: 1000000
Description: Elevation at the footprint location from the SRTM30 (GTOPO30 + SRTM) Digital Elevation Model (DEM). The reference frame for the the DEM elevation was changed to the TOPEX/ Poseidon ellipsoid to make it consistent with the GLAS elevations.
Comments:
Product Var Name: i_DEM_hires_elv
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record
Short Description: High Resolution Elevation
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: meters
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500
Product Maximum: 13000
Description: High resolution regional DEM elevation. See the byte description for the flag i_DEM_hires_src for a full description of the DEM.
Comments:
Product Var Name: i_DEM_hires_src
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record
Short Description: High Resolution Source Flag
Product Data Type: i1b (40)
Total Bytes: 40
Product Units: NA
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 128
Description: View byte description.
Comments: DEM elevations are referenced to the TOPEX/Poseidon ellipsoid and are directly comparable to the elevation on the GLAS products.
Product Var Name: i_DEMmax
Is element of: GLA01 Main Record
Short Description: DEM maximum
Product Data Type: i2b
Total Bytes: 2
Product Units: meters
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -1000
Product Maximum: 12000
Description: Onboard spacecraft DEM maximum elevation used to calculate
hmax. From APID19, Offset 1193.
Comments:
Product Var Name: i_DEMmin
Is element of: GLA01 Main Record
Short Description: DEM minimum
Product Data Type: i2b
Total Bytes: 2
Product Units: meters
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -1000
Product Maximum: 12000
Description: Onboard spacecraft DEM minimum elevation used to calculate
hmin. From APID19, Offset 1192.
Comments:
Product Var Name: i_EchoLandType
Is element of: GLA01 Main Record
Short Description: Echo Land Type
Product Data Type: i1b
Total Bytes: 1
Product Units: unitless
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 3
Description: Surface Echo Land Type for Compression. 0=sea, 1=land,
2=sea/ice, 3=land/ice. From APID19, Offset 231.
Comments: The values of 'p', 'q', and 'N' are surface echo land
type dependent, but can only change once per frame (1sec).
Product Var Name: i_EchoPeakLoc
Is element of: GLA01 Main Record
Short Description: Echo Peak Location
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: nanoseconds
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 5100000
Description: Address (in digitizer counts) of the detected peak
value (as measured from the start of Acquisition Memory, i.e. Start
of digitization). Set to 0 if a threshold crossing was NOT detected.
From APID12/13 offset 100.
Comments:
Product Var Name: i_EchoPeakVal
Is element of: GLA01 Main Record
Short Description: Echo Peak Value
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description: Peak value for the selected filter returned by the
FIR filter engine. Set to 0 if a threshold crossing was not detected.
From APID12/13 offset 96.
Comments:
Product Var Name: i_ElvFlg
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Elevation Definition Flag
Product Data Type: i1b (40)
Total Bytes: 40
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 127
Description: Indicates which location on the received echo was used
to calculate the elevation on the record. View
byte description. 'For GLA06 and 12-15, bits are set
to reflect Standard Fitting. For GLA14, bits are set to reflect
Alternate Fitting. Although defined as a pass-thru, the values are
different on GLA06/12-15 and GLA14.'
Comments:
Product Var Name: i_ElvuseFlg
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Elevation use flag
Product Data Type: i1b (5)
Total Bytes: 5
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -127
Product Maximum: 127
Description: Flag indicating whether the elevations on this record
should be used or not (1 bit set/shot). View
byte description.
Comments:
Product Var Name: i_FRir_ODflg
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Full Resolution 1064 Optical Depth Flag
Product Data Type: i1b (40)
Total Bytes: 40
Product Units: NA
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 0
Description: This parameter is for a 1 second record. This parameter
is also in GLA11.
Comments:
Product Var Name: i_FRir_cldtop
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Full Resolution 1064 Cloud Top
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: deka-meters
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1030
Description: Full resolution (40 Hz) cloud top height obtained from
the 1064 atmospheric channel. This parameter is for a 1 second record.
This parameter is in GLA09.
Comments:
Product Var Name: i_FRir_intsig
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Full Resolution 1064 Integrated Signal
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: e7/(m-sr)
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 10000
Description: Though called 'integrated signal' this is actually
an average of all bins in the above-ground portion of the 1064 40
Hz profile with values above the threshold of 1.0e-7 (1/(m-sr) units).
This parameter is for a 1 second record. This parameter is also
in GLA09.
Comments:
Product Var Name: i_FRir_qaFlag
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Full Resolution 1064 Quality Flag
Product Data Type: i1b (40)
Total Bytes: 40
Product Units: NA
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 15
Description: View byte description.
Comments:
Product Var Name: i_FiltNumMask
Is element of: GLA01 Main Record
Short Description: Filter Selection Mask
Product Data Type: i4b
Total Bytes: 4
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 64
Description: The low order 6 bits, bits 0 through 5, indicate which
filters were selectable for a shot. The definition of complete failure
of the filters has been changed to mean the complete failure of
all SELECTABLE filters. Bit 0: 4 nsec filter, bit 1: 8 nsec filter,
bit 2: 16 nsec filter, bit 3: 32 nsec filter, bit 4: 64 nsec filter,
bit 5: 128 nsec filter. In case of the complete failure of all the
filters, the result of the last 'good' shot shall be used, even
if this mask proscribes the filter choice. A bit value = 1 =selectable;
bit value = 0 = not selectable. From APID19, Offset 30. View
byte description.
Comments:
Product Var Name: i_FrameQF
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Altimeter Frame Quality Flag
Product Data Type: i1b
Total Bytes: 1
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1
Description: Denotes all bad data (no signal in whole frame), or
all data good and all science team recommended corrections applied. View
byte description.
Comments:
Product Var Name: i_GainShiftFlg
Is element of: GLA01 Main Record
Short Description: Gain Shift Flag
Product Data Type: i1b (5)
Total Bytes: 5
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -127
Product Maximum: 127
Description: Flag indicates if the gain has been shifted for the
corresponding measurement. 0=Gain has been shifted (valid) or 1=Gain
has not been shifted (potentially invalid) in this record (1 bit
set/shot). View byte description.
Comments:
Product Var Name: i_Gamp
Is element of: GLA14 Record
Short Description: Amplitudes of Gaussians
Product Data Type: i4b (6, 40)
Total Bytes: 960
Product Units: 0.01 volts
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 300
Description: Amplitude of each Gaussian solved for (up to six),
using the alternate parameters.
Comments:
Product Var Name: i_Garea
Is element of: GLA14 Record
Short Description: Area under Gaussian
Product Data Type: i4b (6, 40)
Total Bytes: 960
Product Units: 0.01 volts * ns
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 348457
Description: Area under each of the Gaussians solved for (up to
six), using alternate parameters.
Comments:
Product Var Name: i_Gsigma
Is element of: GLA14 Record
Short Description: Sigma of Gaussians
Product Data Type: i4b (6, 40)
Total Bytes: 960
Product Units: 0.001 ns
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 327660
Description: Width (sigma) of each Gaussian solved for (up to six),
using alternate parameters.
Comments:
Product Var Name: i_HOff
Is element of: GLA01 Main Record
Short Description: DEM Offset
Product Data Type: i4b (2)
Total Bytes: 8
Product Units: Millimeters
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -1.0D9
Product Maximum: 1.0D9
Description: Offsets associated with the minimum and maximum height
uploaded in the DEM used to define the range window. 1st item: minimum
height offset = DEM uncertainty + bias; default is 1.125 km. 2nd
item: maximum height offset = DEM uncertainty - bias; default is
-0.875 km. From APID19, Offset 1116.
Comments:
Product Var Name: i_IceSVar
Is element of: GLA12 Record
Short Description: Standard Deviation of the ice sheet Gaussian
Fit
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: millivolts
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 25500
Description: The Standard deviation of the difference between the
functional fit and the received echo using standard parameters.
It is directly taken from GLA05 parameter d_wfFitSDev_2 (standard).
Comments:
Product Var Name: i_IceSheetRuf
Is element of: GLA12 Record
Short Description: Ice Sheet Roughness
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: cm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 12000
Description: The surface roughness over the footprint calculated
empirically from the transmitted pulse and received echo assuming
no slope.
Comments:
Product Var Name: i_InstState
Is element of: GLA01 Main Record
Short Description: Instrument State
Product Data Type: i4b
Total Bytes: 4
Product Units: n/a
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 524288
Description: Flag defining current configuration of the GLAS instrument.
This is a common flag. View byte description.
Comments:
Product Var Name: i_IsRngFst
Is element of: GLA12 Record
Short Description: Ice Sheet Range Offset using first peak
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Range offset to be added to i_refRng to calculate ice
sheet specific range from centroid of first peak in standard Gaussian
fit
Comments:
Product Var Name: i_IsRngLast
Is element of: GLA12 Record
Short Description: Ice Sheet Range offset using last peak
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Range offset to be added to i_refRng to calculate ice
sheet specific range from centroid of last peak in standard Gaussian
fit.
Comments:
Product Var Name: i_IsSlopeEmp
Is element of: GLA12 Record
Short Description: Ice Sheet Slope - echo
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: .01 Degrees
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 9000
Description: The surface slope over the footprint calculated empirically
from the transmitted pulse and received echo assuming no roughness.
Comments:
Product Var Name: i_LandSlopeLast
Is element of: GLA14 Record
Short Description: Land Slope - echo - last
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: .01 Degrees
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 9000
Description: The surface slope over the footprint calculated empirically
from the transmitted pulse and received echo assuming no slope using
alternate parameters.
Comments:
Product Var Name: i_LandVar
Is element of: GLA14 Record
Short Description: Standard Deviation of the land Gaussian Fit
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: millivolts
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 25500
Description: The Standard deviation of the difference between the
functional fit and the received echo using alternative parameters.
It is directly taken from GLA05 parameter d_wfFitSDev_1 (alternative).
Comments:
Product Var Name: i_LastThrXingT
Is element of: GLA01 Main Record
Short Description: Last Threshold Crossing Location for Selected
Filter
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: ns
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: No
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 5100000
Description: Address, in digitizer counts, of the detected last
(i.e. last in time) threshold crossing (as measured from the start
of Acquisition Memory, i.e. Start of digitization). Also called
the trailing edge. Set to 0 if threshold crossing was NOT detected.
From APID12/13, Offset 84.
Comments: null
Product Var Name: i_LdRufLstPk
Is element of: GLA14 Record
Short Description: Land Roughness - last
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: cm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 12000
Description: The surface roughness over the footprint calculated
empirically from the transmitted pulse and received echo assuming
no slope using alternate parameters.
Comments:
Product Var Name: i_MRC_af
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Medium Resolution Cloud Availability Flag
Product Data Type: i1b
Total Bytes: 1
Product Units: NA
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 15
Description: Tells how many cloud layers were found at this resolution from the 532 nm channel. View
byte description.
Comments:
Product Var Name: i_N_val
Is element of: GLA01 Main Record , GLA05 record
Short Description: Value of N
Product Data Type: i2b
Total Bytes: 2
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 544
Description: Value of N used for waveform compression for the frame.
From APID19, Offset 236.
Comments: Not valid if APID19 is missing.
Product Var Name: i_NextThrXing
Is element of: GLA01 Main Record
Short Description: Next to Last Threshold Crossing Location for
Selected Filter
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: ns
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: No
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 5100000
Description: Address (in dititizer counts) of the detected next
to last threshold crossing (as measured from the start of Acquisition
Memory, i.e. Start of digitization. Also called the leading edge.
Set to 0 if a threshold crossing was NOT detected. From APID12/13
offset 88.
Comments:
Product Var Name: i_NumCoinc
Is element of: GLA01 Long Waveform Record
Short Description: Number of Coincidences for Selected Filter
Product Data Type: i1b (8)
Total Bytes: 8
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: Yes
Product Minimum: 0
Product Maximum: 255
Description: The number of coincidences between the selected filter
and all other filters (including itself). This is one of the terms
used to calculate the weight of the selected filter. If no filter
is selected, this value is 0.
Comments:
Product Var Name: i_NumCoinc
Is element of: GLA01_Short_Record
Short Description: Number of Coincidences for Selected Filter
Product Data Type: i1b (20)
Total Bytes: 20
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: Yes
Product Minimum: 0
Product Maximum: 255
Description: The number of coincidences between the selected filter
and all other filters (including itself). This is one of the terms
used to calculate the weight of the selected filter. If no filter
is selected, this value is 0.
Comments:
Product Var Name: i_ObSCHt
Is element of: GLA01 Main Record
Short Description: On-board Height of S/C
Product Data Type: i4b
Total Bytes: 4
Product Units: Millimeters
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -1.0D9
Product Maximum: 1.0D9
Description: Geodetic altitude of S/C above earth surface (Hsat).
From APID19, Offset 1092.
Comments:
Product Var Name: i_OcMeanElev
Is element of: GLA15 Record
Short Description: Mean elevation over 1 sec
Product Data Type: i4b
Total Bytes: 4
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500000
Product Maximum: 10000000
Description: 1 -sec mean elevation of the up to 40 GLA15 ocean elevations.
Comments:
Product Var Name: i_OcRMSqf
Is element of: GLA15 Record
Short Description: Ocean RMS Roughness Quality Flag
Product Data Type: i1b (40)
Total Bytes: 40
Product Units: null
Invalid Value/Flag: N
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1
Description: Data quality flag for the ocean roughness. View
byte description.
Comments:
Product Var Name: i_OcRufRMS
Is element of: GLA15 Record
Short Description: RMS of elevations used for 1-sec mean elevation
Product Data Type: i4b
Total Bytes: 4
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 120000
Description: The standard deviation of the up to 40 GLA15 ocean elevations measurements.
Comments:
Product Var Name: i_OceanVar
Is element of: GLA15 Record
Short Description: Standard Deviation of the ocean Gaussian Fit
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: millivolts
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 25500
Description: The Standard deviation of the difference between the
functional fit and the received echo using standard parameters.
It is directly taken from GLA05 parameter d_wfFitSDev_2 (standard).
Comments:
Product Var Name: i_OrbFlg
Is element of: GLA01 Main Record, GLA05 record, GLA06 record, GLA12
Record, GLA13 Record, GLA14 Record, GLA15 Record
Short Description: POD flag (Orbit Flag)
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: NA
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 128
Description: Denotes quality of orbit, whether predicted or precision,
loss of GPS data, maneuver-degraded, etc. For level 1a products,
this will usually be the predicted orbit. View
byte description.
Comments:
Product Var Name: i_PADPoint
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: PAD Pointing unit Vector in ICRF
Product Data Type: i4b (6, 40)
Total Bytes: 960
Product Units: Unitless*1000000
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -1000000
Product Maximum: 1000000
Description: Unit vectors giving the pointing direction of the laser
with respect to the GLAS optical bench axes in the ICRF reference
frame, one vector for each of the 40 shots, at the shot (transmit)
time. Each component is composed of 2 4-byte items.
Comments:
Product Var Name: i_PODFixedPos
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Position orbit vector in ICRF
Product Data Type: i4b (6, 40)
Total Bytes: 960
Product Units: 3 * (m, mm)
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -7.0E+10
Product Maximum: 7.0E+10
Description: Spacecraft position vectors in ICRF of the laser point
of reference on the spacecraft, one vector for each of the 40 shots,
at the bounce (transmit plus transit) time. Each element is composed
of 2 4-byte items. The first is m and the second is millimeters.
Comments:
Product Var Name: i_RMSpulseWd
Is element of: GLA05 record
Short Description: RMS Pulse Width
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: 100 ns
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1000
Description: The RMS width of the entire waveform.
Comments:
Product Var Name: i_RecNrgAll
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Received Energy signal begin to signal end
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: 0.01 fJoules
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32000
Description:
Comments:
Product Var Name: i_RecNrgAll_EU
Is element of: GLA01 Main Record
Short Description: 1064 Laser received Energy from all signal above
threshold
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: attojoules
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: No
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 200000
Description: This is calculated by taking the area under the received
waveform from all responses greater than the threshold and converting
it to energy units.
Comments:
Product Var Name: i_RecNrgLast_EU
Is element of: GLA01 Main Record
Short Description: 1064 nm Laser Received Energy (max pk)
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: attojoules
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 200000
Description: This is the energy in the 1064 nm laser pulse between
the threshold crossings before and after the maximum amplitude in
energy units.
Comments:
Product Var Name: i_RespEndTime
Is element of: GLA01 Main Record
Short Description: Ending Address of Range Reponse
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: nanoseconds
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 5100000
Description: Address (in digitizer counts) of the 2000-byte surface
echo data dump (as measured from the start of Acquisition Memory,
i.e. Start of digitization). Last in time. From APID12/13 offset
80.
Comments:
Product Var Name: i_RminRmax
Is element of: GLA01 Main Record
Short Description: Range Window Start and Stop
Product Data Type: i4b (2)
Total Bytes: 8
Product Units: Meters
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1000000
Description: Range window start and stop in kilometers. From APID19,
Offset 1100.
Comments:
Product Var Name: i_RngSrc_Flag
Is element of: GLA01 Main Record
Short Description: Range Data Source
Product Data Type: i1b
Total Bytes: 1
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 2
Description: Source of Range data: 0 = s/c time and position packet;
1 = uplinked DEM bytes; 2 = uplinked Rmin/Rmax. View
byte description. From APID19, Offset 1194.
Comments:
Product Var Name: i_RufSeaIce
Is element of: GLA13 Record
Short Description: Sea Ice Surface Roughness
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: cm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 12400
Description: Seaice roughness over the footprint computed from the transmitted and received waveforms using the RMS width of the entire waveform. The beginning and ending of the waveform are the location of the first peak of the Gaussian curves fitted by the alternative method plus three times of the sigma of the curve and the location of the last peak of the Gaussian curves minus three times of the sigma, respectively.
Comments:
Product Var Name: i_SeaIceVar
Is element of: GLA13 Record
Short Description: Standard Deviation of the sea ice Gaussian fit
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: millivolts
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 25500
Description: The Standard deviation of the difference between the
functional fit and the received echo using standard parameters.
It is directly taken from GLA05 parameter d_wfFitSDev_2 (standard).
Comments:
Product Var Name: i_SiRngFst
Is element of: GLA13 Record
Short Description: Sea ice range increment to first peak
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Range increment to be added to reference range to compute
the sea ice specific range. This was determined from centroid of
first peak in sea ice Gaussian fit
Comments:
Product Var Name: i_SiRufLstPk
Is element of: GLA13 Record
Short Description: Surface Roughness - last peak
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: cm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 12400
Description: The surface roughness over the footprint calculated
empirically from the transmitted and received waveforms using the
RMS width of the last peak.
Comments:
Product Var Name: i_SiRufMaxPk
Is element of: GLA13 Record
Short Description: Maximum Amplitutde Peak Sea Ice Surface Roughness
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: cm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 12400
Description: The surface slope over the footprint calculated empirically
from the transmitted and received waveforms using the gaussian width
of the maximum amplitude peak.
Comments:
Product Var Name: i_SiRufQF
Is element of: GLA13 Record
Short Description: Sea ice Roughness Quality Flag
Product Data Type: i1b (40)
Total Bytes: 40
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1
Description: Data quality flag for the sea ice roughness indicates
quality based on good vs. bad criteria. View
byte description.
Comments:
Product Var Name: i_SigBegOff
Is element of: GLA14 Record
Short Description: Signal Begin Range Increment
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Range increment to be added to reference range to obtain
signal begin as computed in ground process using the alternate parameterization.
Comments:
Product Var Name: i_SigBegOff
Is element of: GLA06 record
Short Description: Signal Begin Range Offset
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the range in
distance to the location on the received echo calculated as the
beginning of signal (closest to the spacecraft) using standard parameters.
Comments:
Product Var Name: i_SigEndOff
Is element of: GLA14 Record
Short Description: Signal End Range Increment
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Range increment to be added to reference range to signal
end as computed in ground process using the alternate parameterization.
Comments:
Product Var Name: i_SigEndOff
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA15 Record
Short Description: Signal End Range Offset
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the range in
distance to the location on the received echo calculated as the
end of signal (farthest from the spacecraft) using standard parameters.
Comments:
Product Var Name: i_SigmaElv
Is element of: GLA13 Record
Short Description: Sigma of Elevation
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32000
Description: Elevation error estimates, the error from the Gaussian
fit to the received echo associated with the centroid of the last
peak using standard parameters.
Comments:
Product Var Name: i_SigmaElv
Is element of: GLA15 Record
Short Description: Sigma of Elevation
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32000
Description: Elevation error estimates, the error from the Gaussian
fit to the received echo associated with the centroid of the last
peak using standard parameters.
Comments:
Product Var Name: i_SigmaElv
Is element of: GLA06 record, GLA12 Record
Short Description: Sigma of Elevation
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32000
Description: Elevation error estimates, the error from the Gaussian
fit to the received echo associated with the centroid of the last
peak using standard parameters.
Comments:
Product Var Name: i_SigmaElv
Is element of: GLA14 Record
Short Description: Sigma of Elevation - TBD
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32000
Description: The algorithm for calculating this is TBD.
Comments:
Product Var Name: i_SolAng
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Solar Incidence Angle
Product Data Type: i4b
Total Bytes: 4
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -90000000
Product Maximum: 90000000
Description: The solar incidence angle determined during Precision
Orbit Determination processing; it provides the operational sun
angle estimate.
Comments:
Product Var Name: i_Spare1
Is element of: GLA06 record
Short Description: 2 byte spare
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: N/A
Is Correction Flag?: No
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare1
Is element of: GLA14 Record
Short Description: Spare
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare1
Is element of: GLA15 Record
Short Description: Spare
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare1
Is element of: GLA12 Record
Short Description: Spare
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare1
Is element of: GLA13 Record
Short Description: Spare
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare2
Is element of: GLA12 Record
Short Description: Spare
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: null
Invalid Value/Flag: null
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare2
Is element of: GLA15 Record
Short Description: Spare
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare2
Is element of: GLA13 Record
Short Description: Spare
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare2
Is element of: GLA14 Record
Short Description: Spares
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare2
Is element of: GLA06 record
Short Description: spares
Product Data Type: i1b (2)
Total Bytes: 2
Product Units: null
Invalid Value/Flag: null
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare3
Is element of: GLA12 Record
Short Description: Spare
Product Data Type: i1b (3)
Total Bytes: 3
Product Units: N/A
Invalid Value/Flag: null
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare3
Is element of: GLA13 Record
Short Description: Spare
Product Data Type: i1b (3)
Total Bytes: 3
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare3
Is element of: GLA14 Record
Short Description: Spare
Product Data Type: i1b (3)
Total Bytes: 3
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare3
Is element of: GLA15 Record
Short Description: Spares
Product Data Type: i1b (3)
Total Bytes: 3
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare3
Is element of: GLA06 record
Short Description: spares
Product Data Type: i1b (3)
Total Bytes: 3
Product Units: N/A
Invalid Value/Flag: null
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare6
Is element of: GLA12 Record
Short Description: Spare
Product Data Type: i1b (02)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: null
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare6
Is element of: GLA13 Record
Short Description: Spares
Product Data Type: i1b (02)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: NA
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare6
Is element of: GLA14 Record
Short Description: Spares
Product Data Type: i1b (02)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare6
Is element of: GLA15 Record
Short Description: spares
Product Data Type: i1b (02)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare6
Is element of: GLA06 record
Short Description: spares
Product Data Type: i1b (02)
Total Bytes: 2
Product Units: N/A
Invalid Value/Flag: null
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare7
Is element of: GLA13 Record
Short Description: Spares
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: NA
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare7
Is element of: GLA15 Record
Short Description: spares
Product Data Type: i1b (594)
Total Bytes: 594
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare7
Is element of: GLA14 Record
Short Description: spares
Product Data Type: i1b (566)
Total Bytes: 566
Product Units: NA
Invalid Value/Flag: null
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_Spare7
Is element of: GLA06 record
Short Description: spares
Product Data Type: i1b (566)
Total Bytes: 566
Product Units: NA
Invalid Value/Flag: null
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: null
Product Maximum: null
Description:
Comments:
Product Var Name: i_SurfRuf_slpQF
Is element of: GLA06 record, GLA12 Record, GLA14 Record
Short Description: Surface Roughness & Slope Quality Flag
Product Data Type: i1b (40)
Total Bytes: 40
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 127
Description: Per-shot data quality flags indicating quality of i_srf_slope
and i_srf_ruf on this record. View
byte description. For GLA06 and 12-15, bits are set
to reflect Standard Fitting. For GLA14, bits are set to reflect
Alternate Fitting. Although defined as a pass-thru, the values are
different on GLA06/12-15 and GLA14.'
Comments:
Product Var Name: i_Surface_pres
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Surface Pressure
Product Data Type: i2b
Total Bytes: 2
Product Units: millibars of mercury * 10
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 20000
Description:
Comments:
Product Var Name: i_Surface_relh
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Relative Humidity
Product Data Type: i2b
Total Bytes: 2
Product Units: percentage * 100
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 10000
Description:
Comments:
Product Var Name: i_Surface_temp
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Surface Temperature
Product Data Type: i2b
Total Bytes: 2
Product Units: degrees Celsius * 100
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -10000
Product Maximum: 10000
Description:
Comments:
Product Var Name: i_Surface_wdir
Is element of: GLA15 Record
Short Description: Surface Wind Direction Azimuth from North
Product Data Type: i2b
Total Bytes: 2
Product Units: degrees * 10
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 3600
Description:
Comments:
Product Var Name: i_Surface_wind
Is element of: GLA15 Record
Short Description: Surface Wind Speed
Product Data Type: i2b
Total Bytes: 2
Product Units: meters/second * 100
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 20000
Description:
Comments:
Product Var Name: i_TrshRngOff
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA15 Record
Short Description: Threshold Retracker Range Offset
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the range in
distance to the threshold retracker location on the received echo
using standard parameters.
Comments:
Product Var Name: i_TxFlg
Is element of: GLA01 Main Record
Short Description: Transmit Pulse Flag
Product Data Type: i1b (5)
Total Bytes: 5
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -127
Product Maximum: 127
Description: Flag indicating whether the transmit pulse is telemetered
(valid) or not telemetered (invalid) in this record (1 bit set/shot). View
byte description.
Comments:
Product Var Name: i_TxNrg_EU
Is element of: GLA01 Main Record
Short Description: 1064 nm Laser Transmit Energy
Product Data Type: i4b
Total Bytes: 4
Product Units: microjoules
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 90000
Description: The 1064 nm laser pulse transmitted energy in energy
units, computed from the digitized outgoing pulse, the transmit
gain, and the detector temperature.
Comments:
Product Var Name: i_TxWfStart
Is element of: GLA01 Main Record
Short Description: Starting Address of Transmit Pulse Sample
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: ns
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 500000
Description: Starting Address in digitizer counts of the Transmit
Pulse sample relative to the start of digitization. From APID12/13,
Offset 76.
Comments:
Product Var Name: i_UTCTime
Is element of: GLA01 Long Waveform Record, GLA01 Main Record , GLA01_Short_Record,
GLA05 record, GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Transmit Time of First Shot in frame in J2000
Product Data Type: i4b (2)
Total Bytes: 8
Product Units: seconds, microseconds
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 2147483647
Description: The transmit time in UTC of the 1st shot in the 1 second
frame referenced to noon on Jan 1, 2000. The first item is the whole
number of seconds ; the second item is the fractional part in microseconds.
Comments: This is not the ground bounce time, but the transmit time.
Product Var Name: i_WFqual
Is element of: GLA05 record
Short Description: Received Echo Quality Flag
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: NA
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 2147483647
Description: Indicator of the quality of the received echo (waveform);
determined during the received echo assessment process, and the
functional fit. Each 4 byte integer represents 32 bits of flag information. View
byte description.
Comments:
Product Var Name: i_WMinMax
Is element of: GLA01 Main Record
Short Description: Window Size
Product Data Type: i4b (2)
Total Bytes: 8
Product Units: Meters
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1000000
Description: Range window minimum and maximum size. 1st item is
minimum - default is 2 km; 2nd item is maximum - default is 11 km.
From APID19, Offset 1108.
Comments:
Product Var Name: i_areaRecWF1
Is element of: GLA05 record
Short Description: Area uder received echo (alternative)
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: 0.01 volts * ns
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32766
Description: Area under the received echo from signal begin to signal
end using alternative parameters.
Comments: This is calculated after converting the return to voltage.
Product Var Name: i_areaRecWF2
Is element of: GLA05 record
Short Description: Area under received echo (standard)
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: 0.01 volts * ns
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 32766
Description: Area under the received echo from signal begin to signal
end using standard parameters.
Comments: This is calculated after converting the return to voltage.
Product Var Name: i_areaTrWF
Is element of: GLA05 record
Short Description: Area Under Transmitted Pulse
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: 0.01 volts * ns
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 15840
Description: Area under the transmitted pulse calculated from 48
gates telemetered
Comments: Note that the transmit pulse was calibrated and converted
to voltage before calculation.
Product Var Name: i_atmQF
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Atmosphere Flag
Product Data Type: i1b (10)
Total Bytes: 10
Product Units: N/A
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1
Description: Indicates from LIDAR channel if conditions for forward
scattering were favorable. View byte description.
Comments: If forward scattering occurs, it may map to an error in
the elevation measurement. Users may want to delete data with forward
scattering.
Product Var Name: i_atm_avail
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Atmosphere Availability Flag
Product Data Type: i1b
Total Bytes: 1
Product Units: NA
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 15
Description: View byte description.
Comments:
Product Var Name: i_beam_azimuth
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Azimuth
Product Data Type: i4b
Total Bytes: 4
Product Units: degrees*100
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 36000
Description: Az is the direction clockwise from north of the laser
beam vector as seen by an observer at the laser ground spot viewing
toward the spacecraft (i.e., the vector from the ground to the spacecraft).
Comments:
Product Var Name: i_beam_coelev
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Co-elevation
Product Data Type: i4b
Total Bytes: 4
Product Units: degrees*100
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 36000
Description: Co-elevation (CE) is direction from vertical of the
laser beam as seen by an observer located at the laser ground spot.
Comments:
Product Var Name: i_centroid1
Is element of: GLA05 record
Short Description: Centroid retracker offset (alternative)
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: 0.01 ns
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -100000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the two-way
range in time to the location of the centroid of the received echo
from signal begin through signal end defined by the alternative
parameters.
Comments: This is calculated after the received echo and noise values
are calibrated and converted from counts to voltage (see ATBD).
Product Var Name: i_centroid2
Is element of: GLA05 record
Short Description: Centroid retracker offset (standard)
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: 0.01 ns
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -100000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the two-way
range in time to the location of the centroid of the received echo
from signal begin through signal end defined by the standard parameters.
Comments: This is calculated after the received echo and noise values
are calibrated and converted from counts to voltage (see ATBD).
Product Var Name: i_centroidInstr
Is element of: GLA05 record
Short Description: Centroid retracker offset using max peak
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: 0.01 ns
Invalid Value/Flag: gi_invalid_i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -100000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the two-way
range in time to the location on the received echo of the centroid
of the signal surrounding the maximum amplitude peak.
Comments: This is the definition used by the instrument team to
check out the on-board algorithms. See ATBD
Product Var Name: i_cld1_mswf
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Cloud Multiple Scattering Warning Flag
Product Data Type: i1b
Total Bytes: 1
Product Units: NA
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 15
Description: The multiple scattering warning flag (MSWF) is based
on the total column optical depth (aerosol plus cloud) calculated
in GLA11 using 532nm. It is intended as a way to quickly obtain
information about the potential severity of multiple scattering
with regards to the range-to-surface calculated by the altimetry
processing software. It will be output on the GLA11 product for
use by the altimetry group. The multiple scattering warning flag
will have values ranging from 0-14, based on the total column optical
depth as detailed in the PDF. A warning flag value of 15 will signify “invalid”.
An invalid will be encoded if an optical depth in any of the layers
in the 1-second column could not be calculated. This usually occurs
in a very optically “thick” cloud which extinguishes the signal.
It could also occur if the extinction-to-backscatter ratio assignment
is set too high, causing the transmission calculations in the lidar
inversion to go out-of-range. View
byte description.
Comments:
Product Var Name: i_cntRngOff
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA15 Record
Short Description: Centroid Range Offset
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the range in
distance to the location of the centroid of the received echo from
signal begin through signal end defined by the standard parameters.
Comments:
Product Var Name: i_compRatio
Is element of: GLA01 Main Record , GLA05 record
Short Description: Compression Ratios
Product Data Type: i2b (2)
Total Bytes: 4
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 1
Product Maximum: 5
Description: Averaging values p and q for frame. First item is p;
second is q. From APID19, Offset 232. First N downlink samples are
generated by averaging p raw digitized elements and the rest of
the allocated samples in the waveform by averaging q elements.
Comments: Not valid if APID19 is missing.
Product Var Name: i_comp_type
Is element of: GLA01 Long Waveform Record
Short Description: Echo Compression Type
Product Data Type: i1b (8)
Total Bytes: 8
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1
Description: Surface echo compression type. Indicates the type of
compression performed. 0 = N, p, and q; 1 = r. From APID12/13, Offset
154.
Comments:
Product Var Name: i_comp_type
Is element of: GLA01_Short_Record
Short Description: Echo Compression Type
Product Data Type: i1b (20)
Total Bytes: 20
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1
Description: Surface echo compression type. Indicates the type of
compression performed. 0 = N, p, and q; 1 = r. From APID12/13, Offset
154.
Comments:
Product Var Name: i_dShotTime
Is element of: GLA01 Main Record , GLA05 record, GLA06 record, GLA12
Record, GLA13 Record, GLA14 Record, GLA15 Record
Short Description: Laser Shot Time Deltas (shots 2-40)
Product Data Type: i4b (39)
Total Bytes: 156
Product Units: microseconds
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1200000
Description: The time deltas of pulses 2 through 40 to i_UTCTime,
the UTC time tag of the first pulse in the 1-second data frame.
Adding the deltas to i_UTCTime will give the user the time of each
individual shot in the frame.
Comments: To calculate the time for shots 2-40, add these deltas
to the time of the first shot.
Product Var Name: i_dTrop
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA15 Record
Short Description: Range Correction, Dry Troposphere
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -2500
Product Maximum: 0
Description: The range correction due to the dry troposphere; one
correction for each shot.
Comments:
Product Var Name: i_dTrop
Is element of: GLA14 Record
Short Description: Range Correction, Dry Troposphere
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -2500
Product Maximum: 0
Description: Atmospheric dry tropospheric delay correction added
to the elevation
Comments:
Product Var Name: i_deltagpstmcor
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Delta GPS time correction
Product Data Type: i4b
Total Bytes: 4
Product Units: nanoseconds
Invalid Value/Flag: gi_invalid_i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1000000
Description: The high frequency delta GPS time correction calculated
during the precision orbit processing step.
Comments:
Product Var Name: i_elev
Is element of: GLA12 Record
Short Description: Ice Sheet Surface elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500000
Product Maximum: 10000000
Description: Surface elevation with respect to the ellipsoid at
the spot location determined by range using the ice sheet specific
algorithm after instrument corrections, atmospheric delays and tides
have been applied.
Comments:
Product Var Name: i_elev
Is element of: GLA14 Record
Short Description: Land surface Elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500000
Product Maximum: 10000000
Description: Surface elevation with respect to the ellipsoid at
the spot location determined by range using the land-specific fitting
procedure after all instrument corrections, atmospheric delays and
tides have been applied.
Comments:
Product Var Name: i_elev
Is element of: GLA15 Record
Short Description: Ocean Surface Elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500000
Product Maximum: 10000000
Description: Surface elevation with respect to the ellipsoid at
the spot location determined by range using the fitting algorithm
after instrument corrections, atmospheric delays and tides have
been applied.
Comments:
Product Var Name: i_elev
Is element of: GLA13 Record
Short Description: Sea Ice Surface Elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500000
Product Maximum: 10000000
Description: Surface elevation wrt ellipsoid at the spot location
determined by range using the sea ice specific fitting procedure
after atmospheric delays and tides have been applied.
Comments:
Product Var Name: i_elev
Is element of: GLA05 record
Short Description: Spot Surface Elevation with respect to ITRF ellipsoid
(Uncorrected)
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -3300000
Product Maximum: 9000000
Description: The surface elevation with respect to ellipsoid of
the forty laser spots in this record. The elevation is calculated
using the preliminary range, the precision orbit, and precision
attitude with no geodetic corrections applied.
Comments: This will differ from the elevation on the elevation products
where it is calculated from the range corrected for geodetic affects
and measured to a region-type dependent specific location on the
received waveform.
Product Var Name: i_elev
Is element of: GLA06 record
Short Description: Surface Elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500000
Product Maximum: 10000000
Description: Surface elevation with respect to the ellipsoid at
the spot location determined by the ice-sheet specific range after
instrument corrections, atmospheric delays and tides have been applied.
Comments:
Product Var Name: i_engineering
Is element of: GLA01 Main Record
Short Description: Engineering Data
Product Data Type: i2b (12)
Total Bytes: 24
Product Units: various
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -3000
Product Maximum: 5000
Description: The following is from /glas/vob/src/l1a_lib/L_EngCorr_mod.f90
which is called by L1AMgr: d_engineering(1) = active detector temperature
[T_detID if detector=1, T_detID = GLA00_prod%CTHW3_hk(1)%i_PRTad1C24_t
if detector=2, T_detID = GLA00_prod%CTHW3_hk(1)%i_PRTad2C25_t] d_engineering(2)
= active digitizer temperature [T_digID if digitizer=1, T_digID
= GLA00_prod%CTHW3_hk(1)%i_AD1ADCC19_t if digitizer=2, T_digID =
GLA00_prod%CTHW3_hk(1)%i_AD2ADCC20_t] d_engineering(3) = oscillator
board temperature [T_relay = GLA00_prod%CTHW3_hk(1)%i_OscBdC11_t]
d_engineering(4) = Fiber Box temperature [T_fb = GLA00_prod%CTHW3_hk(1)%i_PRTfboxC29_t]
d_engineering(5) thru d_engineering(12) TBD. All temperatures are
in Celsius X 100.
Comments: Engineering data (temperatures, voltages, currents) affecting
the altimetry data. Array of 12 values.
Product Var Name: i_erElv
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA15 Record
Short Description: Solid Earth Tide Elevation (at first & last shot)
Product Data Type: i2b (2)
Total Bytes: 4
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -10000
Product Maximum: 10000
Description: The solid earth tide elevation for the first & last
shot in the record.
Comments:
Product Var Name: i_erElv
Is element of: GLA14 Record
Short Description: Earth Tide Elevation
Product Data Type: i2b (2)
Total Bytes: 4
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -10000
Product Maximum: 10000
Description: Solid earth tide elevation (first and last shot)
Comments:
Product Var Name: i_erd
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Estimated Range Delay
Product Data Type: i2b
Total Bytes: 2
Product Units: Millimeters
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 1000
Description:
Comments:
Product Var Name: i_filtnum
Is element of: GLA01 Long Waveform Record
Short Description: Filter Number
Product Data Type: i1b (8)
Total Bytes: 8
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 5
Description: Filter with the highest weight (0 for 4 nsec filter;
1 for 8 nsec filter; 2 for 16 nsec filter; 3 for 32 nsec filter;
4 for 64 nsec filter; 5 for 128 nsec filter). May or may not be
selectable! If no selectable filter can be chosen, then the last
successful filter, selectable or NOT is chosen. From APID12/13,
Offset 104.
Comments:
Product Var Name: i_filtnum
Is element of: GLA01_Short_Record
Short Description: Filter Number
Product Data Type: i1b (20)
Total Bytes: 20
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 5
Description: Filter with the highest weight (0 for 4 nsec filter;
1 for 8 nsec filter; 2 for 16 nsec filter; 3 for 32 nsec filter;
4 for 64 nsec filter; 5 for 128 nsec filter). May or may not be
selectable! If no selectable filter can be chosen, then the last
successful filter, selectable or NOT is chosen. From APID12/13,
Offset 104.
Comments:
Product Var Name: i_filtr_thresh
Is element of: GLA01 Main Record
Short Description: Selected Filter Threshold Value
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description: Threshold values used to find the last and next to
last threshold crossings for the selected filter. From APID12/13,
Offset 108.
Comments:
Product Var Name: i_gainSet1064
Is element of: GLA01_Short_Record
Short Description: AD Gain Setting
Product Data Type: i2b (20)
Total Bytes: 40
Product Units: unitless
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: No
Is Unsigned?: NA
Product Minimum: 0
Product Maximum: 255
Description: The receiver gain; results of the gain algorithm. From
APID12/13, Offset 148.
Comments: This number has calibrations applied so will differ from
the value on the APID12/13.
Product Var Name: i_gainSet1064
Is element of: GLA01 Long Waveform Record
Short Description: AD Gain Setting
Product Data Type: i2b (8)
Total Bytes: 16
Product Units: counts
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description: The receiver gain; results of the gain algorithm. From
APID12/13, Offset 148.
Comments:
Product Var Name: i_gainStatus
Is element of: GLA01 Long Waveform Record
Short Description: Gain Status Bits
Product Data Type: i1b (8)
Total Bytes: 8
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: Yes
Product Minimum: 0
Product Maximum: 255
Description: Note that these bits are always set to 0 on the first
shot of a science run and when auto gain is disabled. bit 0x1: 0
if the gain loop was run for this shot; 1 if the gain loop was bypassed
for this shot; bit 0x2: 0 if the gain loop did not time out; 1 if
the gain loop timed out and was reset;
Comments:
Product Var Name: i_gainStatus
Is element of: GLA01_Short_Record
Short Description: Gain Status Bits
Product Data Type: i1b (20)
Total Bytes: 20
Product Units: n/a
Invalid Value/Flag: i_APID_AvFlg
Is Correction Flag?: NA
Is Unsigned?: NA
Product Minimum: 0
Product Maximum: 255
Description: Note that these bits are always set to 0 on the first
shot of a science run and when auto gain is disabled. bit 0x1: 0
if the gain loop was run for this shot; 1 if the gain loop was bypassed
for this shot; bit 0x2: 0 if the gain loop did not time out; 1 if
the gain loop timed out and was reset;
Comments:
Product Var Name: i_gdHt
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Geoid
Product Data Type: i2b (2)
Total Bytes: 4
Product Units: cm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -20000
Product Maximum: 20000
Description: The height of the geoid above the ellipsoid for the
first and last shot in the record.
Comments:
Product Var Name: i_gla01_rectype
Is element of: GLA01 Main Record
Short Description: GLA01 Record Type
Product Data Type: i2b
Total Bytes: 2
Product Units: n/a
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 2
Description: Record type indicating whether this record is a main=1,
long=2, or short=3 waveform record.
Comments:
Product Var Name: i_gla01_rectype
Is element of: GLA01 Long Waveform Record
Short Description: GLA01 Record Type
Product Data Type: i2b
Total Bytes: 2
Product Units: n/a
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 2
Description: Record type indicating whether this record is a main=1,
long=2, or short=3 waveform record.
Comments:
Product Var Name: i_gla01_rectype
Is element of: GLA01_Short_Record
Short Description: GLA01 Record Type
Product Data Type: i2b
Total Bytes: 2
Product Units: null
Invalid Value/Flag: no
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 2
Description: Record type indicating whether this record is a main=1,
long=2, or short=3 waveform record.
Comments:
Product Var Name: i_gpCntRngOff
Is element of: GLA14 Record
Short Description: Centroid Range Increment for all 6 peaks
Product Data Type: i4b (6, 40)
Total Bytes: 960
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description:
Comments:
Product Var Name: i_gval_rcv
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Gain Value used for Received Pulse
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: counts
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 200
Description: Gain value used for received pulse - uncalibrated.
Comments: This value is in counts and needs to be calibrated before
calculating energy from it. Same as variable in GLA01_Long/i_gainSet1064.
Product Var Name: i_gval_tx
Is element of: GLA05 record
Short Description: Gain Value used for Transmitted Pulse - uncalibrated
Product Data Type: i2b
Total Bytes: 2
Product Units: counts
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 255
Description: Gain value used for transmitted pulse - uncalibrated
Comments: This value is in counts and needs to be calibrated before
calculating energy from it. Same as variable in GLA01_Main/i_ADdetOutGn.
Product Var Name: i_highElev
Is element of: GLA15 Record
Short Description: Highest Elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500000
Product Maximum: 10000000
Description: Highest elevation in footprint, with all corrections
applied (corresponds to signal begin) using standard parameters.
Comments:
Product Var Name: i_isRngOff
Is element of: GLA06 record, GLA12 Record, GLA14 Record
Short Description: Ice Sheet Range Offset
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Range offset to be added to i_refRng to calculate the
range using the algorithm deemed appropriate for ice sheets.
Comments:
Product Var Name: i_kurt1
Is element of: GLA05 record, GLA14 Record
Short Description: Kurtosis of Received Echo (alternative)
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: unitless * 100
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -1000
Product Maximum: 1000
Description: Kurtosis of the received echo from signal begin to
signal end using alternative parameters
Comments: Note that the received echo was calibrated and converted
to voltage before calculation.
Product Var Name: i_kurt2
Is element of: GLA05 record, GLA06 record, GLA12 Record
Short Description: Kurtosis of the Received Echo (standard)
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: unitless * 100
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -1000
Product Maximum: 1000
Description: Kurtosis of the received echo from signal begin to
signal end using standard parameters
Comments: Note that the received echo was calibrated and converted
to voltage before calculation.
Product Var Name: i_lat
Is element of: GLA12 Record
Short Description: Coordinate Data, Latitude, specific to ice sheet
range
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -90000000
Product Maximum: 90000000
Description: The geodetic latitude of the 40 laser spots in the
1 second time frame, computed from the Precision orbit determined
GLAS laser antenna ground nadir coordinates, precision attitude,
and ice sheet-specific range after all instrument corrections, atmospheric
delays and tides have been applied. The values are in degrees North.
Comments:
Product Var Name: i_lat
Is element of: GLA14 Record
Short Description: Coordinate Data, Latitude, specific to land range
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -90000000
Product Maximum: 90000000
Description: The geodetic latitude of the forty laser spots in the
1 second time frame, computed from the Precision orbit determined
GLAS laser antenna ground nadir coordinates, precision attitude,
and land-specific range after all instrument corrections, atmospheric
delays and tides have been applied. The values are in degrees North.
Comments:
Product Var Name: i_lat
Is element of: GLA15 Record
Short Description: Coordinate Data, Latitude, specific to ocean
range
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -90000000
Product Maximum: 90000000
Description: The geodetic latitude of the forty laser spots in the
1 second time frame, computed from the Precision orbit determined
GLAS laser antenna ground nadir coordinates, precision attitude,
and ocean-specific range after all instrument corrections, atmospheric
delays and tides have been applied. The values are in degress North.
Comments:
Product Var Name: i_lat
Is element of: GLA13 Record
Short Description: Coordinate Data, Latitude, specific to sea ice
range
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -90000000
Product Maximum: 90000000
Description: The geodetic latitude of the 40 laser spots in the
1 second time frame, computed from the Precision orbit determined
GLAS laser antenna ground nadir coordinates, PAD, and sea ice specific
range after all atmospheric corrections and tides have been applied.
Comments:
Product Var Name: i_lat
Is element of: GLA06 record
Short Description: Spot 1 Coordinate Data, Latitude Corrected
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -90000000
Product Maximum: 90000000
Description: The geodetic latitude of the 40 laser spots in the
1 second time frame, computed from the Precision orbit, precision
attitude, and ice-sheet specific range after instrument corrections,
atmospheric delays and tides have been applied. The values are in
degrees North.
Comments:
Product Var Name: i_lat
Is element of: GLA05 record
Short Description: Spot Coordinate Data - Latitude (Uncorrected)
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: Microdegrees
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -90000000
Product Maximum: 90000000
Description: The geodetic latitude of the forty laser spots in this
record, computed from the Precision orbit, precision attitude, and
preliminary range. The preliminary range is used with no geodetic
corrections applied.
Comments: This latitude may differ from that on GLA06 and the level
2 elevation products where a corrected range is used in the calculation
Product Var Name: i_ldElv
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Load Tide Elevation
Product Data Type: i2b (4)
Total Bytes: 8
Product Units: mm
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -10000
Product Maximum: 10000
Description: The load tide elevation applied to each shot. Elements
1-4 of the load tide vector are applied to shots 1-10, 11-20, 21-30,
and 31-40, respectively.
Comments: The load tide is NOT NECESSARILY the load tide for shots
1,11,21,31. It is calculated for the first valid shot in each group
of 10 and applied to all valid shots in the group.
Product Var Name: i_ldRngOff
Is element of: GLA06 record, GLA14 Record
Short Description: Land Range Offset
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -150000
Product Maximum: 0
Description: Range offset to be added to i_refRng to calculate the
range using the algorithm deemed appropriate for land.
Comments:
Product Var Name: i_locTr
Is element of: GLA05 record
Short Description: Centroid of Transmitted Pulse in time relative
to gate 1 of tr wf
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: 0.01 ns
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 4800
Description: Time from gate 1 of the transmitted pulse to the centroid
of transmitted pulse calculated from 48 gates telemetered
Comments: Note that the pulse was calibrated and converted to voltage
before calculation.
Product Var Name: i_lon
Is element of: GLA12 Record
Short Description: Coordinate Data, Longitude, specific to ice sheet
range
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 360000000
Description: The longitude of the 40 laser spots in the 1 second
time frame, computed from the Precision orbit determined GLAS laser
antenna ground nadir coordinates, precision attitude, and ice sheet-specific
range after all instrument corrections, atmospheric delays and tides
have been applied. The values are in east longitude.
Comments:
Product Var Name: i_lon
Is element of: GLA14 Record
Short Description: Coordinate Data, Longitude, specific to land
range
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 360000000
Description: The longitude of the forty laser spots in the 1 second
time frame, computed from the Precision orbit determined GLAS laser
antenna ground nadir coordinates, precision attitude, and land-specific
range after all instrument corrections, atmospheric delays and tides
have been applied. The values are in east longitude.
Comments:
Product Var Name: i_lon
Is element of: GLA15 Record
Short Description: Coordinate Data, Longitude, specific to ocean
range
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 360000000
Description: The longitude of the forty laser spots in the 1 second
time frame, computed from the Precision orbit determined GLAS laser
antenna ground nadir coordinates, precision attitude, and ocean-specific
range after all instrument corrections, atmospheric delays and tides
have been applied. The values are in east longitude.
Comments:
Product Var Name: i_lon
Is element of: GLA13 Record
Short Description: Coordinate Data, Longitude, specific to sea ice
range
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 360000000
Description: The longitude of the 40 laser spots in the 1 second
time frame, computed from the Precision orbit determined GLAS laser
antenna ground nadir coordinates, PAD, and sea ice specific range
after all atmospheric corrections and tides have been applied. The
values are in east longitude.
Comments:
Product Var Name: i_lon
Is element of: GLA06 record
Short Description: Spot 1 Coordinate Data, Longitude Corrected
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: microdeg
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 360000000
Description: The longitude of the 40 laser spots in the 1 second
time frame, computed from the Precision orbit, precision attitude,
and ice-sheet specific range after instrument corrections, atmospheric
delays and tides have been applied. The values are in east longitude.
Comments:
Product Var Name: i_lon
Is element of: GLA05 record
Short Description: Spot Coordinate Data - Longitude (Uncorrected)
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: Microdegrees
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: 0
Product Maximum: 360000000
Description: The longitude of the forty laser spots in this record,
computed from the Precision orbit,precision attitude, and preliminary
range. The preliminary range is used with no geodetic corrections
applied.
Comments: This longitude may differ from that on GLA06 and the level
2 products where a corrected range is used in the calculation
Product Var Name: i_lowElev
Is element of: GLA15 Record
Short Description: Lowest Elevation
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: mm
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -500000
Product Maximum: 10000000
Description: Lowest elevation in footprint, with all corrections
applied (corresponds to signal end) using standard parameters.
Comments:
Product Var Name: i_maxRecAmp
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Max Amplitude of Received Echo
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: Tenth of millivolts
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -300
Product Maximum: 30000
Description: Maximum Amplitude of the Received Echo.
Comments: This is calculated after converting the return to voltage.
Use for scaling model fit RMS between normalized and un-normalized
units.
Product Var Name: i_maxSmAmp
Is element of: GLA05 record, GLA06 record, GLA12 Record, GLA13 Record,
GLA14 Record, GLA15 Record
Short Description: Peak Amplitude of Smoothed Received Echo
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: Tenth of millivolts
Invalid Value/Flag: No
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -300
Product Maximum: 30000
Description: The peak amplitude of the received echo after it has
been smoothed to remove high frequency noise (see ATBD).
Comments: This is calculated after converting the return to voltage.
Product Var Name: i_maxTrAmp
Is element of: GLA05 record
Short Description: Maximum Amp of Transmitted Pulse
Product Data Type: i2b (40)
Total Bytes: 80
Product Units: 0.1 millivolts
Invalid Value/Flag: i2b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -300
Product Maximum: 30000
Description: Maximum amplitude of transmitted pulse calculated from
all (48) gates telemetered
Comments: Note that the pulse was calibrated and converted to voltage
before calculation.
Product Var Name: i_minRngOff1
Is element of: GLA05 record
Short Description: Minimum Range Offset (alternative)
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: 0.01 ns
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -100000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the two-way
range in time to the location on the received echo calculated as
the beginning of signal (closest to the spacecraft) using alternate
parameters.
Comments: This is calculated after the received echo and noise values
are calibrated and converted from counts to voltage as the first
received gate where the voltage is > n*sigma (see ATBD). The value
of n may be different than threshold retracker.
Product Var Name: i_minRngOff2
Is element of: GLA05 record
Short Description: Minimum Range Offset (standard)
Product Data Type: i4b (40)
Total Bytes: 160
Product Units: 0.01 ns
Invalid Value/Flag: i4b
Is Correction Flag?: NA
Is Unsigned?: No
Product Minimum: -100000
Product Maximum: 0
Description: Offset to be added to i_refRng to give the two-way
range in time to the location on the received echo calculated as
the beginning of signal (closest to the spacecraft) closest to the
spacecraft using standard parameters.
Comments: This is calculated after the received echo and noise values
are calibrated and converted from counts to voltage as the first
received gate where the voltage is > n*sigma (see ATBD). The value
of n may be different than threshold retracker.
Product Var Name: i_msCorrFlg
Is element of: GLA06 record, GLA12 Record, GLA13 Record, GLA14 Record,
GLA15 Record
Short Description: Multi-Scatter Range Correction
Product Data Type: i1b (40)
Total Bytes: 40
Product Units: Unknown 
