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Description

The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Surface Radiance VNIR and Crosstalk Corrected SWIR (AST_09XT) contains atmospherically corrected data for the Visible and Near Infrared (VNIR) and Shortwave Infrared (SWIR) sensors. The AST_09XT product has a spatial resolution of 15 meters (m) for the VNIR bands and 30 m for the SWIR bands. Both the VNIR and the SWIR data are atmospherically corrected using the corresponding bands from an ASTER Level 1B image.

Known Issues

  • Level 2 products that are on the international date line/anti-meridian have incorrect bounding coordinates for the UTM zone defined in the file metadata.
  • SWIR data acquired after April 2008 may exhibit anomalous saturation and striping. Users should consult the ASTER SWIR User Advisory for additional details.

Version Description

The following changes and improvements were implemented for ASTER Level 2 Version 4 data products: (1) ASTER V4 uses Modern-Era Retrospective analysis for Research and Applications Version 2 (MERRA-2) data as the primary source for atmospheric parameters (ozone, water vapor, pressure, and temperature), improving the precision of emissivity calculations, (2) When MERRA-2 data are unavailable, the product employs Global Data Assimilation System (GDAS) data as a backup, with climatology data serving as a final fallback to ensure continuous processing, and (3) Data format has transitioned from legacy HDF-EOS2 to Cloud Optimized GeoTIFF (COG).

Product Summary

Platforms
Terra
Instruments
ASTER
Spatial Extent

N: 83 S: -83 E: 180 W: -180

Spatial Resolution
15 Meters x 15 Meters
30 Meters x 30 Meters
Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2000-03-06 to Present
Data Partner
Land Processes Distributed Active Archive Center (LP DAAC) ,
Ground Data System, Japan Space Systems, National Institute of Advanced Industrial Science and Technology, Ministry of Economy, Trade, and Industry, Japan (JP/METI/AIST/JSS/GDS)
Concept ID
C3306887285-LPCLOUD
Data State
ACTIVE
Number of Files/Granules
3452269
Processing Level
2
Published
Updated
Science Keywords
INFRARED FLUX ,
Infrared Imagery ,
Infrared Radiance ,
VISIBLE FLUX ,
VISIBLE IMAGERY ,
Visible Radiance

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

NASA/METI/AIST/Japan Spacesystems and U.S./Japan ASTER Science Team. (2025). ASTER L2 Surface Radiance VNIR and Crosstalk Corrected SWIR V004 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/ASTER/AST_09XT.004 Date Accessed: 2026-01-26

File Naming Convention

AST_09XT_00412092020072723_20250912144409_SRA_VNIR_QA_DataPlane2.tif

The file name begins with the Product Short Name (AST_09XT), followed by the 3-digit Version Number plus the Date and Time of Acquisition designated as MMDDYYYYHHMMSS (00412092020072723), Date and Time of Processing designated as YYYYMMDDHHMMSS (20250912144409), Product Type (SRA), Band Type (VNIR), Band/Variable (QA_DataPlane2), and the Data Format (tif).

Documents

Publications Citing This Dataset

Filters
Title Year Author
The use of Terra-Aster satellite for landslide detection Vecchiotti, F.
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Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
SWIR_Band4 30 meter resolution SWIR Band 4 (1.600 to 1.700 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.2174
SWIR_Band5 30 meter resolution SWIR Band 5 (2.145 to 2.185 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.0696
SWIR_Band6 30 meter resolution SWIR Band 6 (2.185 to 2.225 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.0625
SWIR_Band7 30 meter resolution SWIR Band 7 (2.235 to 2.285 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.0597
SWIR_Band8 30 meter resolution SWIR  Band 8 (2.295 to 2.365 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.04178
SWIR_Band9 30 meter resolution SWIR Band 9 (2.360 to 2.430 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.0318
VNIR_Band1 15 meter resolution VNIR Band 1 (0.52 to 0.60 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.676
VNIR_Band2 15 meter resolution VNIR Band 2 (0.63 to 0.69 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.708
VNIR_Band3N 15 meter resolution VNIR Band 3 (0.78 to 0.86 µm) W/m²/sr/μm int16 N/A 0 to 32767 0.862
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