AST14OTH v003

ASTER Orthorectified Registered Radiance at the Sensor


PI: U.S./Japan ASTER Science Team

Description

The ASTER Orthorectified Registered Radiance at the Sensor (AST14OTH) products contain imagery transformed from a perspective projection to an orthogonal one. An orthorectified image possesses the geometric characteristics of a map with near-vertical views for every location. These products are terrain corrected, provide radiometrically calibrated radiance, and are mapped to the Universal Transverse Mercator (UTM) coordinate system.

The inputs include the following: an ASTER Level 1A Reconstructed Unprocessed Instrument dataset; georeferencing information from the ASTER instrument's and Terra platform's ephemeris and attitude data; and an ASTER-derived digital elevation model (DEM). The output product includes fifteen orthorectified ASTER Level 1B calibrated radiance images, one per band, as listed below.

The ASTER Orthorectified Registered Radiance at the Sensor data product is only available through NASA’s Earthdata Search. The ASTER Order Instructions provide step-by-step directions for ordering this product.

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Characteristics

Improvements/Changes from Previous Versions

As of January 2021, the LP DAAC has implemented version 3.0 of the Sensor Information Laboratory Corporation ASTER DEM/Ortho (SILCAST) software, which is used to generate the Level 2 on-demand ASTER Orthorectified and Digital Elevation Model (DEM) products (AST14). The updated software provides digital elevation extraction and orthorectification from ASTER L1B input data without needing to enter ground control points or depending on external global DEMs at 30-arc-second resolution (GTOPO30). It utilizes the ephemeris and attitude data derived from both the ASTER instrument and the Terra spacecraft platform. The outputs are geoid height-corrected and waterbodies are automatically detected in this version. Users will notice differences between AST14DEM, AST14DMO, and AST14OTH products ordered before January 2021 (generated with SILCAST V1) and those generated with the updated version of the production software (version 3.0). Differences may include slight elevation changes over different surface types, including waterbodies. Differences have also been observed over cloudy portions of ASTER scenes. Additional information on SILCAST version 3.0 can be found on the SILCAST website.

Contact User Services for additional questions.

Collection and Granule

Collection

Characteristic Description
CollectionTerra ASTER
DOI10.5067/ASTER/AST14OTH.003
File Size~42 MB
Temporal ResolutionOther
Temporal Extent2000-03-06 to Present
Spatial ExtentGlobal
Coordinate SystemUniversal Transverse Mercator (UTM)
DatumWorld Geodetic System (WGS84)
File FormatGeoTIFF
Geographic Dimensions~60 km x 60 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers15
Columns/RowsVaries by scene x Varies by scene
Pixel Size15 m (VNIR), 30 m (SWIR), and 90 m (TIR)

Layers

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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 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) W/m²/sr/μm 16-bit unsigned integer N/A N/A 0 to 65535 N/A

Known Issues

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.

Documentation

Using the Data

Access Data

Citation

DOI: 10.5067/ASTER/AST14OTH.003

About the Image

Terra ASTER Orthorectified Registered Radiance at the Sensor band 1 data from the AST14OTH product over Colorado, United States on May 25, 2018.

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