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Title:
Satellite-image-derived velocity field of an Antarctic ice stream
Authors:
Bindschadler, R. A.; Scambos, T. A.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(ST Systems Corp., Lanham, MD)
Publication:
Science (ISSN 0036-8075), vol. 252, April 12, 1991, p. 242-246. (Sci Homepage)
Publication Date:
04/1991
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
Antarctic Regions, Flow Velocity, Glaciers, Glaciology, Satellite Imagery, Cross Correlation, Ice Reporting, Thematic Mappers (Landsat), Topography
DOI:
10.1126/science.252.5003.242
Bibliographic Code:
1991Sci...252..242B

Abstract

The surface velocity of a rapidly moving ice stream has been determined to high accuracy and spatial density with the use of sequential satellite imagery. Variations of ice velocity are spatially related to surface undulations, and transverse velocity variations of up to 30 percent occur. Such large variations negate the concept of plug flow and call into question earlier mass-balance calculations for this and other ice streams where sparse velocity data were used. The coregistration of images with the use of the topographic undulations of the ice stream and the measurement of feature displacement with cross-correlation of image windows provide significant improvements in the use of satellite imagery for ice-flow determination.
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Database: Astronomy
Physics
arXiv e-prints