Terra ASTER reconstructed unprocessed instrument band combination 3n-2-1 data from the AST_L1A product over Guatemala on January 8, 2018.
View full-size imageThe Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Level 1A (AST_L1A) contains reconstructed, instrument digital numbers (DNs) derived from the acquired telemetry streams of the telescopes: Visible and Near Infrared (VNIR), Shortwave Infrared (SWIR), and Thermal Infrared (TIR). Additionally, geometric correction coefficients and radiometric calibration coefficients are calculated and appended to the metadata, but not applied.
Starting June 23, 2021, radiometric calibration coefficient Version 5 (RCC V5) will be applied to newly observed ASTER data and archived ASTER data products. Details regarding RCC V5 are described in the following journal article.
Tsuchida, S., Yamamoto, H., Kouyama, T., Obata, K., Sakuma, F., Tachikawa, T., Kamei, A., Arai, K., Czapla-Myers, J.S., Biggar, S.F., and Thome, K.J., 2020, Radiometric Degradation Curves for the ASTER VNIR Processing Using Vicarious and Lunar Calibrations: Remote Sensing, v. 12, no. 3, at https://doi.org/10.3390/rs12030427.
| Characteristic | Description |
|---|---|
| Collection | Terra ASTER |
| DOI | 10.5067/ASTER/AST_L1A.003 |
| File Size | ~90 MB |
| Temporal Resolution | Other |
| Temporal Extent | 2000-03-04 to Present |
| Spatial Extent | Global |
| Coordinate System | N/A |
| Datum | World Geodetic System (WGS84) |
| File Format | HDF-EOS |
| Geographic Dimensions | ~60 km x 60 km |
| Characteristic | Description |
|---|---|
| Number of Science Dataset (SDS) Layers | 15 |
| Columns/Rows | 4100 (VNIR), 5000 (VNIR 3B), 2048 (SWIR), and 700 (TIR) x 4200 (VNIR), 5400 (VNIR 3B), 2100 (SWIR), and 700 (TIR) |
| Pixel Size | 15 m (VNIR), 30 m (SWIR), and 90 m (TIR) |
| SDS Name | Description | Units | Data Type | Fill Value | No Data Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|---|
| VNIR_Band1 | 15 meter resolution VNIR Band 1 (0.52 to 0.60 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| VNIR_Band2 | 15 meter resolution VNIR Band 2 (0.63 to 0.69 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| VNIR_Band3N | 15 meter resolution VNIR Band 3N (0.78 to 0.86 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| VNIR_Band3B | 15 meter resolution VNIR Band 3B (0.78 to 0.86 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| SWIR_Band4 | 30 meter resolution SWIR Band 4 (1.600 to 1.700 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| SWIR_Band5 | 30 meter resolution SWIR Band 5 (2.145 to 2.185 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| SWIR_Band6 | 30 meter resolution SWIR Band 6 (2.185 to 2.225 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| SWIR_Band7 | 30 meter resolution SWIR Band 7 (2.235 to 2.285 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| SWIR_Band8 | 30 meter resolution SWIR Band 8 (2.295 to 2.365 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| SWIR_Band9 | 30 meter resolution SWIR Band 9 (2.360 to 2.430 µm) | N/A | 8-bit unsigned integer | N/A | N/A | 0 to 255 | N/A |
| TIR_Band10 | 90 meter resolution TIR Band 10 (8.125 to 8.475 µm) | N/A | 16-bit unsigned integer | N/A | N/A | 0 to 65535 | N/A |
| TIR_Band11 | 90 meter resolution TIR Band 11 (8.475 to 8.825 µm) | N/A | 16-bit unsigned integer | N/A | N/A | 0 to 65535 | N/A |
| TIR_Band12 | 90 meter resolution TIR Band 12 (8.925 to 9.275 µm) | N/A | 16-bit unsigned integer | N/A | N/A | 0 to 65535 | N/A |
| TIR_Band13 | 90 meter resolution TIR Band 13 (10.25 to 10.95 µm) | N/A | 16-bit unsigned integer | N/A | N/A | 0 to 65535 | N/A |
| TIR_Band14 | 90 meter resolution TIR Band 14 (10.95 to 11.65 µm) | N/A | 16-bit unsigned integer | N/A | N/A | 0 to 65535 | N/A |
Each HDF file contains multiple dimensions. See the User Guide for more information.
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.