Files are compressed (zipped) for delivery, with a .gz extension added to the file names described below.
EASE-Grid Files
The EASE-Grid brightness temperature data files are named according to the following convention and as described in Table 1:
ID2r3-AMSRE-SL2005135D.v01.89V
ID2rx-AMSRE-aayyyydddp.vnn.ccc
Where:
Table 1. EASE-Grid Brightness Temperature Data Files' Naming Convention
Variable |
Description |
---|
ID2 |
Inverse Distance Squared |
---|
rx |
Resolution number of swath input data (r1, r3) |
---|
AMSRE |
Identifies this a file containing AMSR-E data |
---|
aa |
Area of coverage (NL = north, SL = south, ML = global) |
---|
yyyy |
Four-digit year |
---|
ddd |
Three-digit day of year |
---|
p |
Pass direction (A = ascending, D = descending) |
---|
vnn |
Data version number (for example, v01, v02) |
---|
ccc |
AMSR-E channel indicator: numeric frequency (06, 10, 18, 23, 36, or 89) followed by polarization (H or V) |
---|
The EASE-Grid time files follow the same naming convention, except they end in the extension .TIM
.
ID2r3-AMSRE-SL2005135D.v01.TIM
.
Quarter Degree Files
The quarter degree brightness temperature data files are named according to the following convention and as described in Table 2.
ID2r1-AMSRE-D.252005135D.v01.89V
ID2r1-AMSRE-D.25yyyydddp.vnn.ccc
Where:
Table 2. Description of Quarter Degree Brightness Temperature File Name Variables
Variable |
Description |
---|
ID2 |
Inverse Distance Squared |
---|
r1 |
Resolution 1 swath input data |
---|
AMSRE |
Identifies this an AMSR-E file |
---|
D.25 |
Identifies this as a quarter degree file |
---|
yyyy |
Four-digit year |
---|
ddd |
Three-digit day of year |
---|
p |
Pass direction (A = ascending, D = descending) |
---|
vnn |
Gridded data version number (for example, v01, v02, v03) |
---|
ccc |
AMSR-E channel indicator: numeric frequency (06, 10, 18, 23, 36, or 89) followed by polarization (H or V) |
---|
Time files follow the same naming convention, except they end with the extension .TIM
.
ID2r1-AMSRE-D.252005135D.v01.TIM
.
Version Numbers
The version number in the file names (vnn
) indicates the version of the gridded brightness temperature data set, as described in Table 3. This version number also reflects the level of AMSR-E/Aqua L2A Global Swath Spatially-Resampled Brightness Temperatures (AE_L2A) source data used.
Table 3. Version Number Description
Version |
Description |
---|
v01 |
All version v01 gridded brightness temperature data were produced from beta-level AMSR-E source data (AE_L2A version Bxx).
Users of v01 gridded data should replace them with v03 gridded data as they become available, because the source data were upgraded from beta-level to validated for v03. |
---|
v02 |
Version v02 gridded brightness temperature data were produced from validation-level AMSR-E source data (AE_L2A version Vxx).
Users of v02 gridded data should replace them with v03 gridded data as they become available, because v03 data address the known edge-contamination problem in the source data. |
---|
v03 |
Version v03 gridded brightness temperature data are produced from validation-level AMSR-E source data (AE_L2A version Vxx). In addition, v03 data exclude the first 14 samples of each scan from the AE_L2A source data due to an issue with possible contamination at that edge of the scan. |
---|
Users should always work with the latest (highest version number) gridded brightness temperature data available for a given date.
When a new version becomes available, any previously-released data (lower version numbers) will be reprocessed to the latest version (highest version number). The new data are staged to the HTTPS site as they become available, replacing the earlier version data for the same date. For example, as v03 north and south azimuthal EASE-Grid data become available on the HTTPS site, they replace the previously available v01 or v02 data for the same date. (Note: The global cylindrical EASE-Grid and global quarter-degree gridded brightness temperature data were initially released as version v03.)
Please see AMSR-E Data Versions for more information about the AE_L2A source data versions.
Resolution Number
The rx resolution number in the file name indicates the resolution number (resolution 1 or resolution 3) of the brightness temperatures extracted from the AE_L2A source data. See the Processing Steps section for more information about this resolution number.