AST_L1BE v003

ASTER Expedited L1B Registered Radiance at the Sensor


PI: U.S./Japan ASTER Science Team

Description

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Expedited Level 1B Registered Radiance at the Sensor data product is radiometrically calibrated and geometrically co-registered. Application of intra-telescope and inter-telescope registration corrections for all bands are relative to the reference band for each telescope: Visible and Near Infrared (VNIR) Band 2, Shortwave Infrared (SWIR) Band 6, and Thermal Infrared (TIR) Band 11. The Expedited Level 1B data product is similar to the AST_L1B with a few notable exceptions. These include:

  • The AST_L1BE is available for download within 48 hours of acquisition in support of field calibration and validation efforts, in addition to emergency response for natural disasters where the quick turn-around time from acquisition to availability would prove beneficial in initial damage or impact assessments.
  • The registration quality of the AST_L1BE is likely to be lower than the AST_L1B, and may vary from scene to scene.
  • The AST_L1BE dataset does not contain the VNIR 3B (aft-viewing) Band.
  • This dataset does not have short-term calibration for the Thermal Infrared (TIR) sensor.

Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionTerra ASTER
DOI10.5067/ASTER/AST_L1BE.003
File Size~97 MB
Temporal ResolutionOther
Temporal Extent2000-03-04 to Present
Spatial ExtentGlobal
Coordinate SystemUniversal Transverse Mercator (UTM)
DatumWorld Geodetic System (WGS84)
File FormatHDF-EOS or GeoTIFF
Geographic Dimensions~60 km x 60 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers14
Columns/Rows4980 x 4200 (VNIR), 2490 x 2100 (SWIR), and 830 x 700 (TIR)
Pixel Size15 m (VNIR), 30 m (SWIR), and 90 m (TIR)

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor Additional Offset
VNIR_Band1 15 meter resolution VNIR Band 1 (0.52 to 0.60 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
VNIR_Band2 15 meter resolution VNIR Band 2 (0.63 to 0.69 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
VNIR_Band3N 15 meter  resolution VNIR Band 3 (0.78 to 0.86 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
SWIR_Band4 30 meter resolution SWIR Band 4 (1.600 to 1.700 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
SWIR_Band5 30 meter resolution SWIR Band 5 (2.145 to 2.185 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
SWIR_Band6 30 meter resolution SWIR Band 6 (2.185 to 2.225 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
SWIR_Band7 30 meter resolution SWIR Band 7 (2.235 to 2.285 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
SWIR_Band8 30 meter resolution SWIR Band 8 (2.295 to 2.365 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
SWIR_Band9 30 meter resolution SWIR Band 9 (2.360 to 2.430 µm) W/m²/sr/μm 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
TIR_Band10 90 meter resolution TIR Band 10 (8.125 to 8.475 µm) W/m²/sr/μm 16-bit unsigned integer N/A N/A 0 to 65535 N/A N/A
TIR_Band11 90 meter resolution TIR Band 11 (8.475 to 8.825 µm) W/m²/sr/μm 16-bit unsigned integer N/A N/A 0 to 65535 N/A N/A
TIR_Band12 90 meter resolution TIR Band 12 (8.925 to 9.275 µm) W/m²/sr/μm 16-bit unsigned integer N/A N/A 0 to 65535 N/A N/A
TIR_Band13 90 meter resolution TIR Band 13 (10.25 to 10.95 µm) W/m²/sr/μm 16-bit unsigned integer N/A N/A 0 to 65535 N/A N/A
TIR_Band14 90 meter resolution TIR Band 14 (10.95 to 11.65 µm) W/m²/sr/μm 16-bit unsigned integer N/A N/A 0 to 65535 N/A N/A

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.

Documentation

Using the Data

Data In Action

When there’s a disaster, look for ASTER

Tools

Citation

DOI: 10.5067/ASTER/AST_L1BE.003

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