Combination of SRTM3 and repeat ASTER data for deriving alpine glacier flow velocities in the Bhutan Himalaya
作者： A. Kääb
DOI: 10.1016/J.RSE.2004.11.003
关键词:
摘要: Abstract The present study evaluates the fusion of DEMs from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument Shuttle Radar Topography Mission (SRTM). area consists high elevation glaciers draining through rough topography Bhutan Himalayas. It turns out that ASTER-derived SRTM3 have similar accuracy over area, but DEM contains less gross errors. However, for large sections contain no data. We therefore compile a combined SRTM3-ASTER DEM. From this final composite-master DEM, we produce repeat ASTER orthoimages which evaluate quality derive glacier surface velocities image matching. tongues north Himalayan main ridge, enter Tibet plateau, show maximum in order 100–200 m year−1. In contrast, ice within south ridge flows with few tens meters per year. These findings number implications, among others dynamics, response to climate change, lake development, or glacial erosion. indicates space-based remote sensing can provide new insights into magnitude selected processes feedback mechanisms govern mountain geodynamics.
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