ASTER L1T: Terrain-Corrected Satellite Radiance Data in Cloud-Optimized GeoTIFFs

ASTER L1T data provides calibrated at-sensor radiance, geometrically corrected and rotated to a north-up UTM projection. The data is derived from the ASTER L1A product using a single resampling step and incorporates GLS2000 digital elevation data for precision terrain correction. Each granule is provided as three separate Cloud-Optimized GeoTIFF files corresponding to the VNIR (15m), SWIR (30m), and TIR (90m) sensors, with metadata for converting digital numbers to radiance and reflectance.

Use Cases

• Land cover classification based on calibrated radiance values across VNIR, SWIR, and TIR spectral bands.
• Topographic analysis and terrain modeling based on precision-corrected data incorporating GLS2000 elevation data.
• Environmental change detection based on time-series comparisons of geometrically corrected, north-up UTM scenes.
• Radiometric calibration of other imagery using the embedded metadata for converting digital numbers to physical units.

Strengths

• Data undergoes precision terrain correction using GLS2000 digital elevation data and ground control points.
• Products are delivered in Cloud-Optimized GeoTIFF (COG) format, which is optimized for online access.
• Metadata required for transforming digital numbers to radiance and reflectance is embedded within the files.

Limitations

• Row count and total dataset size are unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics and data structure must be inferred after download.
• Last update date is unknown; freshness of the specific dataset instance is unverified.

Provenance

Source

EarthDaily via the aws_open_data platform.

Collection Method

Data from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument, processed to Level 1T (Precision Terrain Corrected Registered At-Sensor Radiance).

Time Range

null

Freshness

null

Geography

Global coverage from the ASTER satellite sensor.