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The data dictionary in this section describes the elements associated with the two Scientific Data Set (SDS) objects contained in the TOVS Path-P files. The first SDS object is Global Attributes which defines attributes that describe an individual Path-P file and contains information common to all of the data set arrays in the file. The other SDS object is Scientific Data Sets which describes the individual scientific data arrays and their associated metadata.
The attributes that comprise the Global Attributes object are defined by the following elements:
Element
Parameter Name = PROJECT
Definition = Name of project
Format = string
Type = character
Length = Max 256
Range =
Comment = Current Value is "TOVS PATHFINDER PATHP"
Element
Parameter Name = DATASET_NAME
Definition = Producer's name of data set
Format = string
Type = character
Length = Max 256
Range =
Comment = Possible values for this project are
"Gridded Daily Arctic Atmospheric Data from TOVS(PathP)"
"Gridded Monthly Arctic Atmospheric Data from TOVS(PathP)"
Element
Parameter Name = SOURCE_NAME
Definition = Satellite Platform
Format = string
Type = character
Length = Max 256
Range = NOAA-10
Comment =
Element
Parameter Name = PROCESSING_LEVEL
Definition = Level of Processing Number
Format = string
Type = character
Length = Max 256
Range =
Comment = Value is "3"
Element
Parameter Name = REFERENCE_DATE
Definition = Date or time period for which this granule is
representative
Format = yyyy-mm-dd
Type = character
Length = Max 256
Range =
Comment =
Element
Parameter Name = START_DATE
Definition = Date and time of first datapoint in granule
Format = yyyy-mm-ddTHH:MM:SS
Type = character
Length = Max 256
Range =
Comment = Example of this attribute is "1987-10-01T01:41:51"
Element
Parameter Name = STOP_DATE
Definition = Date and time of last datapoint in granule
Format = yyyy-mm-ddTHH:MM:SS
Type = character
Length = Max 256
Range =
Comment = Example of this attribute is "1987-10-01T22:41:51"
Element
Parameter Name = POSITION_TYPE
Definition = A type of spatial object defined in the NSIDC IMS
Server
Format =
Type = character
Length = Max 256
Range =
Comment = Value of this attribute is "FIXED GRID"
Element
Parameter Name = GRID_TYPE
Definition = Northern or Southern Hemisphere
Format =
Type = character
Length = 1
Range =
Comment = Possible values are "N" or "S"
Element
Parameter Name = GRID_NAME
Definition = Name of Grid
Format = string
Type = character
Length = Max 256
Range =
Comment = Value for this attribute is "EASE GRID"
Element
Parameter Name = PROJECTION
Definition = Geographical projection of the grid
Format = string
Type = character
Length = Max 256
Range =
Comment = Value for this attribute is "Azimuthal Equal Area"
Element
Parameter Name = EASE_GRD
Definition = Grid parameter file used by NSIDC gridding software
Format = string
Type = character
Length = Max 256
Range =
Comment = This file defines the parameters required by the
gridding software developed by NSIDC.
Element
Parameter Name = EASE_MPP
Definition = Map projection parameter file used by NSIDC
projection software
Format = string
Type = character
Length = Max 256
Range =
Comment = This file defines the parameters of the EASE-Grid
map projection required by the projection software
developed by NSIDC.
Element
Parameter Name = LATITUDE
Definition = Latitude of the corner points of the grid
Format = f6.3
Type = float32
Length = 4 * float32 (16 bytes)
Range = (-90,90)
Comment = Array of latitude values corresponding to the
x,y grid coordinates [0,0], [0,66], [66,66], [66,0]
Element
Parameter Name = LONGITUDE
Definition = Longitude of corner points of the grid
Format = f6.3
Type = float32
Length = 4 * float32 (16 bytes)
Range = (-180,180)
Comment = Array of longitude values corresponding to the
x,y grid coordinates [0,0], [0,66], [66,66], [66,0]
Element
Parameter Name = Temporal_Res
Definition = Temporal resolution of the data set
Format = string
Type = character
Length = Max 256
Range =
Comment = Possible values are "daily" or "monthly"
Element
Parameter Name = Spatial_X_Res
Definition = Spatial resolution of data set in x direction
Format = string
Type = character
Length = Max 256
Range = 100.27 km
Comment =
Element
Parameter Name = Spatial_Y_Res
Definition = Spatial resolution of data set in y direction
Format = string
Type = character
Length = Max 256
Range = 100.27 km
Comment =
Element
Parameter Name = PRODUCER_GRANULE_ID
Definition = Name of granule when generated on production system
Format = string
Type = character
Length = Max 256
Range =
Comment = Unix system file name generated on POLES SCF system
Element
Parameter Name = PRODUCER_DATE
Definition = Date granule was produced
Format = string
Type = character
Length = Max 256
Range =
Comment = Example of value used for this attribute is
"Mon May 16 11:21:38 1994"
Element
Parameter Name = PRODUCER_PROGRAM
Definition = RCS header for production software
Format = string
Type = character
Length = Max 256
Range =
Comment = Example of a value for this attribute is
"$Header: /home/n1/PathP/development/src/l3
/gridgen/RCS/PPgridL2.c, v1.1 1994/05/11/23:08:09
axel Exp axel $"
Element
Parameter Name = PRODUCER_REVISION_DATE
Definition = Date of last modification to production program
Format = string
Type = character
Length = Max 256
Range =
Comment = Example of value for this attribute is
"Mon May 16 11:14:23 1994"
Element
Parameter Name = PRODUCER_ARCHITECTURE
Definition = Production machine architecture and Operating System
Format = string
Type = character
Length = Max 256
Range =
Comment = Example of the information provided by this
attribute is "SunOS.4.1.3_UI node: nansen"
Element
Parameter Name = PRODUCER_COMMENT
Definition = Any comment the producer feels necessary to add
Format = string
Type = character
Length = Max 256
Range =
Comment = Example of the information provided by this
attribute is "SunOS.4.1.3_UI node: nansen"
Element
Parameter Name = PRODUCER_DOCUMENT
Definition = Document that describes this data set
Format = string
Type = character
Length = Max 256
Range =
Comment = Value for this attribute is "PATH-P_USERS_GUIDE.TXT"
Attributes that comprise the Scientific Data Sets object are defined by the following elements:
Element
Parameter Name = LATITUDE_GRID
Definition = Latitude coordinate of each grid point
Format = f6.3
Type = 32 bit floating point Scientific Data Set
Units = degrees
Size = 67 x 67
Comment = This Scientific Data (SD) is stored in an external SD
file: LatGrd.exhdf
Element
Parameter Name = LONGITUDE_GRID
Definition = Longitude coordinate of each grid point
Format = f6.3
Type = 32 bit floating point Scientific Data Set
Units = degrees
Size = 67 x 67
Comment = This Scientific Data (SD) is stored in an external SD
file: LonGrd.exhdf
Element
Parameter Name = TEMP
Definition = Temperatures [K] at pressure levels
50, 70, 100, 300, 400, 500, 600, 700, 850 millibars
Format = f6.3
Type = 32 bit floating point Scientific Data Set
Units = degrees of Kelvin
Size = 9 x 67 x 67
Comment =
Element
Parameter Name = TEMP-SD
Definition = Time Standard Deviation of TEMP
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = degrees of Kelvin
Size = 9 x 67 x 67
Comment =
Element
Parameter Name = WVAPOR
Definition = Precipital water [mm] of layers bounded by 300-400,
400-500, 500-700, 500-850, 850-1000 millibars
Format = f6.3
Type = 32 bit floating point Scientific Data Set
Units = mm
Size = 5 x 67 x 67
Comment =
Element
Parameter Name = WVAPOR-SD
Definition = Time Standard Deviation of WVAPOR
Format = f6.3
Type = 32 bit floating point Scientific Data Set
Units = mm
Size = 5 x 67 x 67
Comment =
Element
Parameter Name = SKTEMP
Definition = Surface skin temperature [K]
400-500, 500-700, 500-850, 850-1000 millibars
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = degrees of Kelvin
Size = 67 x 67
Comment =
Element
Parameter Name = SKTEMP-SD
Definition = Time Standard Deviation of SKTEMP
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = degrees of Kelvin
Size = 67 x 67
Comment =
Element
Parameter Name = FCLD
Definition = Total effective cloud fraction [%]
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = percent
Size = 67 x 67
Comment = Effective cloud fraction is the retrieved
radiatively effective cloud fraction and is the
product of the actual cloud fraction and the
cloud emissivity. This parameter corresponds to
the actual cloud fraction if clouds had unit
emissivity.
Element
Parameter Name = FCLD-SD
Definition = Time Standard Deviation of FCLD[%]
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = percent
Size = 67 x 67
Comment =
Element
Parameter Name = CLPRESS
Definition = Cloudtop pressure [mb]
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units = millibars
Size = 67 x 67
Comment =
Element
Parameter Name = CLPRESS-SD
Definition = Time Standard Deviation of CLPRESS
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units = millibars
Size = 67 x 67
Comment =
Element
Parameter Name = CLTEMP
Definition = Cloudtop temperature [K]
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = degrees of Kelvin
Size = 67 x 67
Comment =
Element
Parameter Name = CLTEMP-SD
Definition = Time Standard Deviation of CLTEMP
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = degrees of Kelvin
Size = 67 x 67
Comment =
Element
Parameter Name = ZANGLE
Definition = Effective satellite zenith angle defined as the
arccosine of the average value of the cosines of
the cosines of the individual satellite zenith angles.
Format = f5.2
Type = 32 bit floating point Scientific Data Set
Units = degrees
Size = 67 x 67
Comment =
Element
Parameter Name = ZANGLE-SD
Definition = Time Standard Deviation of ZANGLE
Format = f5.2
Type = 32 bit floating point Scientific Data Set
Units = degrees
Size = 67 x 67
Comment =
Element
Parameter Name = EMISS
Definition = Surface emissivity at 50 GHz (MSU Channel 1)
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units =
Size = 67 x 67
Comment = This variable may be used to provide a surface
type classification.
Element
Parameter Name = EMISS-SD
Definition = Time Standard Deviation of EMISS
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units =
Size = 67 x 67
Comment =
Element
Parameter Name = PBLSTRAT
Definition = Boundary layer bulk stratification (difference
in potential temperature between the surface and
at 900 mb.
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = degrees of Kelvin
Size = 67 x 67
Comment =
Element
Parameter Name = PBLSTRAT-SD
Definition = Time Standard Deviation for PBLSTRAT
Format = f5.1
Type = 32 bit floating point Scientific Data Set
Units = degrees of Kelvin
Size = 67 x 67
Comment =
Element
Parameter Name = Cg
Definition = Geostrophic drag coefficient over sea ice
(Overland and Davidson, 1992).
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units =
Size = 67 x 67
Comment = This value is parameterized after Overland and
Davidson, 1992. This variable is calculated only
over sea ice.
Element
Parameter Name = Cg-SD
Definition = Time Standard Deviation for Cg
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units =
Size = 67 x 67
Comment =
Element
Parameter Name = ALPHA
Definition = Turning angle between the geostrophic wind and the
surface wind over sea ice (Overland and Davidson,
1992).
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units = degrees
Size = 67 x 67
Comment = This variable is based on the parameterization of
Overland and Davidson (1992) and is calculated only
over sea ice. Positive values represent counter
clockwise turning angles.
Element
Parameter Name = ALPHA-SD
Definition = Time Standard Deviation for ALPHA
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units = degrees
Size = 67 x 67
Comment =
Element
Parameter Name = IIIreject
Definition = Number of III rejections per grid cell
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units = counts
Size = 67 x 67
Comment = IIIreject is the number of retrievals rejected for
an individual grid cell by the algorithm. Under
certain conditions the processing algorithm is
not able to perform a retrieval. These conditions
are often associated with thick clouds. Only actual
rejections are counted. A value of zero (0) may mean
that no rejections occured or that no observations
were available for the respective grid cell.
Element
Parameter Name = OBS
Definition = Number of non-rejected observations per grid cell
Format = f3.0
Type = 32 bit floating point Scientific Data Set
Units = counts
Size = 67 x 67
Comment = The number of valid ovservations per cell. By
examining the values of OBS and IIIreject, the
user can determine the fraction of rejected
observations. The derived fraction may provide
an indication of how well the retrieved values
represent atmospheric conditions for a given time
period.
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