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EDG Data Set Name
ASTER L1A Reconstructed Unprocessed Instrument Data
Granule Shortname
AST_L1A
Data Set Characteristics
| Area: |
~60 km x 60 km |
| Image Dimensions: |
|
VNIR: 4200 rows x 4100 columns
VNIR (3B): 5400 rows x 5000 columns
SWIR: 2100 rows x 2048 columns
TIR: 700 rows x 700 columns
|
| File Size: |
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VNIR (1,2,3N) = 51,660,000 Bytes
VNIR (3B) = 23,000,000 Bytes
SWIR (4-9) = 25,804,800 Bytes
TIR (10-14) = 4,900,000 Bytes
Total = 107 Megabytes
|
| Spatial Resolution: |
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VNIR = 15 m
SWIR = 30 m
TIR = 90 m
|
| Data Format: HDF-EOS |
| Vgroup Data Fields: 15 |
Product Description
The ASTER instrument aboard the Terra satellite has a complement of three different telescopes with varying pointing capabilities. Data derived from ASTER are primarily generated based on Data Acquisition Requests (DARs) from users. Level-1 datasets are produced at the Ground Data System (GDS) in Tokyo, Japan, and sent to the Land Processes (LP) Distributed Active Archive Center (DAAC) for archiving and distribution. The ASTER Level-1A product contains reconstructed, unprocessed instrument digital data derived from the telemetry streams of the 3 telescopes and their respective ground resolutions: Visible Near Infrared (VNIR), 15 m, Shortwave Infrared (SWIR), 30 m, and Thermal Infrared (TIR), 90 m. These depacketized, demultiplexed, and realigned instrument image data have their geometric correction coefficients and radiometric calibration coefficients calculated and appended but not applied. It also includes corrections for the SWIR parallax, and intra- and inter-telescope registration information. The EOS Data Gateway (EDG) also provides browse images for each of the Level-1A VNIR, SWIR, and TIR data groups that can be viewed and/or requested.
Vgroup Data Fields/
Spectral Range (µm) |
Units |
Data Type |
Valid Range |
Telescope Pointing
Capability |
VNIR (15 Meters) |
| Band 1 (0.52 - 0.60) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 24° |
| Band 2 (0.63 - 0.69) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 24° |
| Band 3N (0.78 - 0.86) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 24° |
| Band 3B (0.78 - 0.86) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 24° |
SWIR (30 Meters) |
| Band 4 (1.600 - 1.700) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 8.55° |
| Band 5 (2.145 - 2.185) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 8.55° |
| Band 6 (2.185 - 2.225) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 8.55° |
| Band 7 (2.235 - 2.285) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 8.55° |
| Band 8 (2.295 - 2.365) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 8.55° |
| Band 9 (2.360 - 2.430) |
Digital Counts |
8-bit unsigned integer |
0 - 255 |
+/- 8.55° |
TIR (90 Meters) |
| Band 10 (8.125 - 8.475) |
Digital Counts |
16-bit unsigned integer |
0 - 65535 |
+/- 8.55° |
| Band 11 (8.475 - 8.825) |
Digital Counts |
16-bit unsigned integer |
0 - 65535 |
+/- 8.55° |
| Band 12 (8.925 - 9.275) |
Digital Counts |
16-bit unsigned integer |
0 - 65535 |
+/- 8.55° |
| Band 13 (10.25 - 10.95) |
Digital Counts |
16-bit unsigned integer |
0 - 65535 |
+/- 8.55° |
| Band 14 (10.95 - 11.65) |
Digital Counts |
16-bit unsigned integer |
0 - 65535 |
+/- 8.55° |
Print or save this information in .pdf format
View .pdf version 
Order Data through the EOS Data Gateway
(http://edcimswww.cr.usgs.gov/pub/imswelcome/)
EOS Data Gateway Search Tips
| Data Center: |
LPDAAC |
| Sensor: |
ASTER |
| Dataset: |
ASTER L1A Reconstructed Unprocessed Instrument Data |
| Geographic Extent: |
Type latitude/longitude range or delineate a geographic search window |
| Temporal Extent: |
March 4, 2000 to present |
Product Information
Contact Information
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