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Description
The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Level 1B (AST_L1B) 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 AST_L1B product has a spatial resolution of 15 meters (m) for the VNIR bands, 30 m for the SWIR bands, and 90 m for the TIR bands.
Known Issues
TIR bands: Acquisitions for TIR bands ended on January 16, 2026, at 05:10:45 UTC, when the ASTER TIR instrument was permanently turned off due to power limitations on the Terra spacecraft. More information is available in this NASA Science News Brief.
Data acquisition gaps: On November 28, 2024, one of Terra's power-transmitting shunt units failed. As a result, there was insufficient power to maintain functionality of the ASTER instrument. ASTER resumed acquisitions for the VNIR bands on January 18, 2025, and for the TIR bands on April 15, 2025. Users should note the data gap in ASTER acquisitions from November 28, 2024, through January 16, 2025, for VNIR observations, and a gap from November 28, 2024, through April 15, 2025, for TIR acquisitions.
SWIR bands: ASTER SWIR detectors are no longer functioning as of January 12, 2009, due to anomalously high SWIR detector temperatures.
SWIR anomaly: Users are advised that ASTER SWIR data acquired from April 2008 to January 11, 2009, 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 for more details.
15 Meters x 15 Meters 30 Meters x 30 Meters 90 Meters x 90 Meters
Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2000-03-04 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
C3306888201-LPCLOUD
Data State
ACTIVE
Number of Files/Granules
4814768
Processing Level
1B
Published
Updated
Science Keywords
REFLECTED INFRARED
,
THERMAL INFRARED
,
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.
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Citation Copied
NASA/METI/AIST/Japan Spacesystems and U.S./Japan ASTER Science Team. (2025). ASTER L1B Registered Radiance at the Sensor V004 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/ASTER/AST_L1B.004 Date Accessed: 2026-05-03
NASA/METI/AIST/Japan Spacesystems and U.S./Japan ASTER Science Team. “ASTER L1B Registered Radiance at the Sensor V004.” NASA Land Processes Distributed Active Archive Center, 2025. doi:10.5067/ASTER/AST_L1B.004. Date Accessed: 2026-05-03
NASA/METI/AIST/Japan Spacesystems and U.S./Japan ASTER Science Team. ASTER L1B Registered Radiance at the Sensor V004. NASA Land Processes Distributed Active Archive Center, 2025, doi:10.5067/ASTER/AST_L1B.004. Date Accessed: 2026-05-03
File Naming Convention
AST_L1B_00401242021232347_20250912150246.hdf
The file name begins with the Product Short Name (AST_L1B), followed by the 3-digit Version Number plus the Date and Time of Acquisition designated as MMDDYYYYHHMMSS (00401242021232347), Date and Time of Processing designated as YYYYMMDDHHMMSS (20250912150246), and the Data Format (hdf).
Takodjou Wambo, Jonas Didero, Pour, Amin Beiranvand, Ganno, Sylvestre, Asimow, Paul D., Zoheir, Basem, Salles, Rodrigo dos Reis, Nzenti, Jean Paul, Pradhan, Biswajeet, Muslim, Aidy M.
Patil, Virupakshagowda C., Al-Gaadi, Khalid A., Madugundu, Rangaswamy, Tola, ElKamil H. M., Marey, Samy, Aldosari, Ali, Biradar, Chandrashekhar M., Gowda, Prasanna H.