ASTER DEM performance

ASTER DEM performance

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument onboard the National Aeronautics and Space Administration's Terra spacecraft has an along-track stereoscopic capability using its a near-infrared spectral band to acquire the stereo data. ASTER has two telesco...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2005-12, Vol.43 (12), p.2707-2714
Main Authors: Fujisada, H., Bailey, G.B., Kelly, G.G., Hara, S., Abrams, M.J.
Format: Article
Language:eng
Subjects:
Accuracy
Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument
Computer programs
digital elevation model (DEM)
Digital elevation models
Discrete element method
Grounds
high resolution
Horizontal
Instruments
Layout
Onboard
optical sensor
Radiometers
Radiometry
Reflection
Space vehicles
Spatial resolution
Spectral bands
stereo
System performance
Telescopes
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Description
Summary:The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument onboard the National Aeronautics and Space Administration's Terra spacecraft has an along-track stereoscopic capability using its a near-infrared spectral band to acquire the stereo data. ASTER has two telescopes, one for nadir-viewing and another for backward-viewing, with a base-to-height ratio of 0.6. The spatial resolution is 15 m in the horizontal plane. Parameters such as the line-of-sight vectors and the pointing axis were adjusted during the initial operation period to generate Level-1 data products with a high-quality stereo system performance. The evaluation of the digital elevation model (DEM) data was carried out both by Japanese and U.S. science teams separately using different DEM generation software and reference databases. The vertical accuracy of the DEM data generated from the Level-1A data is 20 m with 95% confidence without ground control point (GCP) correction for individual scenes. Geolocation accuracy that is important for the DEM datasets is better than 50 m. This appears to be limited by the spacecraft position accuracy. In addition, a slight increase in accuracy is observed by using GCPs to generate the stereo data.
ISSN:0196-2892
1558-0644