ASTER L2 Surface Reflectance VNIR and Crosstalk Corrected SWIR V004

Description

The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Surface Reflectance VNIR and Crosstalk Corrected SWIR (AST_07XT) dataset contains measures of the fraction of incoming solar radiation reflected from the Earth’s surface to the ASTER instrument corrected for atmospheric effects and viewing geometry for both the Visible and Near Infrared (VNIR) and Shortwave Infrared (SWIR) sensors. Both the VNIR and SWIR data are atmospherically corrected and are generated using the bands of the corresponding ASTER [L1B](https://doi.org/10.5067/ASTER/AST_L1B.004) image. The AST_07XT product has a spatial resolution of 15 meters (m) for the VNIR bands and 30 m for the SWIR bands.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.Improvements/Changes from Previous Versions* SWIR Crosstalk Correction: Applies a correction to reduce stray light effects in the SWIR bands, enhancing data quality by minimizing artifacts. Enhanced Atmospheric Correction: Version 4 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. Fallback Mechanisms: 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. Radiometric Calibration Update: Version 4 applies Radiometric Calibration Coefficient Version 5 (RCC V5) to improve the radiometric accuracy of the raw DNs, based on research by [Tsuchida and others (2020)](https://doi.org/10.3390/rs12030427), published in Remote Sensing.

Resources

Name Format Description Link
33 ASTER_User_Handbook_v4.pdf https://lpdaac.usgs.gov/documents/1319/ASTER_User_Handbook_v4.pdf
5 https://search.earthdata.nasa.gov%2Fsearch%3Fq%3DC3306884993-LPCLOUD
5 https://lpdaac.usgs.gov%2F
5 https://asterweb.jpl.nasa.gov%2F
5 https://doi.org%2F10.5067%2FASTER%2FAST_07XT.004
5 https://lpdaac.usgs.gov%2Fdocuments%2F68%2FAST_07_ATBD.pdf
5 https://lpdaac.usgs.gov%2Fdocuments%2F67%2FAST_07_User_Guide_V3.pdf
5 https://lpdaac.usgs.gov%2Fdocuments%2F1319%2FASTER_User_Handbook_v4.pdf
5 https://data.lpdaac.earthdatacloud.nasa.gov%2Flp-prod-public%2FAST_07XT.004%2FAST_07XT_00410012004185627_20250401120222%2FAST_07XT_00410012004185627_20250401120222.jpg
5 https://lpdaac.usgs.gov%2Fdocuments%2F2243%2FASTER_User_Guide_V4.pdf
5 https://lpdaac.usgs.gov%2Fdocuments%2F1661%2FASTER_SWIR_User_Advisory_Jan_12_2009.pdf
5 https://www.earthdata.nasa.gov%2Fcenters%2Flp-daac
5 https://search.earthdata.nasa.gov/search?q=C3306884993-LPCLOUD
5 https://www.earthdata.nasa.gov/centers/lp-daac
21 AST_07XT.004 https://doi.org/10.5067/ASTER/AST_07XT.004
33 AST_07_ATBD.pdf https://lpdaac.usgs.gov/documents/68/AST_07_ATBD.pdf
33 AST_07_User_Guide_V3.pdf https://lpdaac.usgs.gov/documents/67/AST_07_User_Guide_V3.pdf
22 AST_07XT_00410012004185627_20250401120222.jpg https://data.lpdaac.earthdatacloud.nasa.gov/lp-prod-public/AST_07XT.004/AST_07XT_00410012004185627_20250401120222/AST_07XT_00410012004185627_20250401120222.jpg
33 ASTER_User_Guide_V4.pdf https://lpdaac.usgs.gov/documents/2243/ASTER_User_Guide_V4.pdf
33 ASTER_SWIR_User_Advisory_Jan_12_2009.pdf https://lpdaac.usgs.gov/documents/1661/ASTER_SWIR_User_Advisory_Jan_12_2009.pdf
5 https://asterweb.jpl.nasa.gov/

Tags

  • earth-science-surface-radiative-properties-land-surface-reflectance
  • earth-science-surface-radiative-properties-land-surface-albedo

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