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AST_L1A V003

10.5067/ASTER/AST_L1A.003
ASTER L1A Reconstructed Unprocessed Instrument Data
AST_L1A

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Level-1A (AST_L1A) contains reconstructed, instrument digital numbers (DNs) derived from the acquired telemetry streams of the telescopes: Visible and Near Infrared (VNIR), Shortwave Infrared (SWIR)*, and Thermal Infrared (TIR). Additionally, geometric correction coefficients and radiometric calibration coefficients are calculated and appended to the metadata, but not applied.

Improvements/Changes from Previous Versions

  • Geometric correction to account for Earth’s rotation angle and nutation.
  • Geometric correction for geolocation errors associated with nighttime TIR scenes.
  • Radiometric correction to account for degradation of on-board calibration lamps.

Collection

Characteristic Description
Temporal Granularity Other
Temporal Extent 2000 - Present
Spatial Extent Global
File Size ~90 MB
Coordinate System N/A
Datum WGS84
File Format HDF-EOS
Geographic Dimensions ~60 km x 60 km

 

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers 15
Columns/Rows 4100 x 4200 (VNIR), 5000 x 5400 (VNIR 3B), 2048 x 2100 (SWIR), 700 x 700 (TIR)
Pixel Size 15 m (VNIR), 30 m (SWIR), and 90 m (TIR)

 

Data Layer Characteristics

SDS Name Description Units Data Type Fill Value Valid Range Scale Factor
VNIR_Band1

15 meter resolution VNIR Band 1 (0.52 to 0.60 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
VNIR_Band2

15 meter resolution VNIR Band 2 (0.63 to 0.69 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
VNIR_Band3N

15 meter resolution VNIR Band 3N (0.78 to 0.86 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
VNIR_Band3B

15 meter resolution VNIR Band 3B (0.78 to 0.86 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
SWIR_Band4

30 meter resolution SWIR Band 4 (1.600 to 1.700 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
SWIR_Band5

30 meter resolution SWIR Band 5 (2.145 to 2.185 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
SWIR_Band6

30 meter resolution SWIR Band 6 (2.185 to 2.225 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
SWIR_Band7

30 meter resolution SWIR Band 7 (2.235 to 2.285 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
SWIR_Band8

30 meter resolution SWIR Band 8 (2.295 to 2.365 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
SWIR_Band9

30 meter resolution SWIR Band 9 (2.360 to 2.430 µm)

Digital Counts 8-bit unsigned integer

N/A

0 to 255

N/A
TIR_Band10

90 meter resolution TIR Band 10 (8.125 to 8.475 µm)

Digital Counts 16-bit unsigned integer

N/A

0 to 65535

N/A
TIR_Band11

90 meter resolution TIR Band 11 (8.475 to 8.825 µm)

Digital Counts 16-bit unsigned integer

N/A

0 to 65535

N/A
TIR_Band12

90 meter resolution TIR Band 12 (8.925 to 9.275 µm)

Digital Counts 16-bit unsigned integer

N/A

0 to 65535

N/A
TIR_Band13

90 meter resolution TIR Band 13 (10.25 to 10.95 µm)

Digital Counts 16-bit unsigned integer

N/A

0 to 65535

N/A
TIR_Band14

90 meter resolution TIR Band 14 (10.95 to 11.65 µm)

Digital Counts 16-bit unsigned integer

N/A

0 to 65535

N/A

 

Each HDF file contains multiple dimensions. See the User Guide for more information.

 

Known Issues

*Users are advised that ASTER SWIR data acquired from April 2008 to the present exhibit anomalous saturation of values and anomalous striping. This effect is also present for some prior acquisition periods. Please refer to the ASTER SWIR User Advisory Document for more details.

AST_L1A. Acquired May 21, 2017. Mt. Diablo, California.

AST_L1A. Acquired May 21, 2017. Mt. Diablo, California.

PI Name: 
U.S./Japan ASTER Science Team
Decommissioned: 
False