MOD29 and MYD29 Local Attributes
Local attributes describe the data and provide summary data on the results of the sea ice algorithm. Two types of local attributes are reported: HDF predefined, and custom local attributes.
HDF Predefined Local Attributes
| Attribute Name |
Reserved Label(s) |
Definition |
Sample Value |
| Label |
long_name |
Long name of the SDS |
Sea ice by reflective characteristics |
| Unit |
units |
SI units of the data, if any |
none |
| Format |
format |
How the data should be viewed in Fortran format notation |
I3 |
| Coordinate system |
coordsys |
Coordinate system to use for the data |
cartesian |
| Range |
valid_range |
Max and min values within a selected data range |
0,254 |
| Fill Value |
_FillValue |
Data used to fill gaps in the swath |
65535 (IST) |
| Calibration |
scale_factor
scale_factor_err
add_offset
add_offset_err
calibrated_nt |
Used if data are stored in calibrated form (IST only) |
|
Custom Local Attributes
| Sea Ice by Reflectance |
| Attribute Name |
Definition |
Sample Value |
| Key |
Key to meaning of data |
See pixel values. |
| Nadir_data_resolution |
Nominal spatial resolution of the pixels at nadir |
1 km |
| Valid EV Obs Band 2 |
Percentage¹ of valid observations from Level 1B in Band 2 of the swath |
100.0 |
| Valid EV Obs Band 4 |
Percentage¹ of valid observations from Level 1B in Band 4 of the swath |
100.0 |
| Valid EV Obs Band 6 |
Percentage¹ of valid observations from Level 1B in Band 6 of the swath |
100.0 |
| Saturated EV Obs Band 2 |
Percentage¹ of saturated observations from Level 1B in Band 2 of the swath |
0.287 |
| Saturated EV Obs Band 4 |
Percentage¹ of saturated observations from Level 1B in Band 4 of the swath |
0.779 |
| Saturated EV Obs Band 6 |
Percentage¹ of saturated observations from Level 1B in Band 6 of the swath |
0.698 |
| Ice Surface Temperature |
| Attribute Name |
Definition |
Sample Value |
| Key: |
Key to meaning of data |
See pixel values. |
| Valid EV Obs Band 31 |
Percentage of valid observations from level 1B in band 31 in the swath |
100.0 |
| Valid EV Obs Band 32 |
Percentage of valid observations from level 1B in band 32 in the swath |
100.0 |
| Saturated EV Obs Band 31 |
Percentage of saturated observations from level 1B in band 31 in the swath |
0.287 |
| Saturated EV Obs Band 32 |
Percentage of saturated observations from level 1B in band 32 in the swath |
0.779 |
| Auto_Check_QA |
For internal QA checks |
"Acceptable" |
| IST coefficients, <240 |
Coefficients used in the IST calculation for the given temperature range |
-0.15, 0.99, 1.39, -0.41 |
| IST coefficients, 240-260 |
-3.32, 1.01, 1.21, 0.13 |
| IST coefficients, >260 |
-5.02, 1.01, 1.51, 0.26 |
| Sea Ice by IST |
| Attribute Name |
Definition |
Sample Value |
| Key: |
Key to meaning of data |
See pixel values. |
| Combined Sea Ice |
| Attribute Name |
Definition |
Sample Value |
| Key: |
Key to meaning of data |
See pixel values. |
¹ These percentages are based on the total number of pixels in the swath (x dimensions * y dimensions).
