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Observation of sea-ice dynamics using synthetic aperture radar images: Automated analysisThe European Space Agency's ERS-1 satellite, as well as others planned to follow, is expected to carry synthetic-aperture radars (SARs) over the polar regions beginning in 1989. A key component in utilization of these SAR data is an automated scheme for extracting the sea-ice velocity field from a time sequence of SAR images of the same geographical region. Two techniques for automated sea-ice tracking, image pyramid area correlation (hierarchical correlation) and feature tracking, are described. Each technique is applied to a pair of Seasat SAR sea-ice images. The results compare well with each other and with manually tracked estimates of the ice velocity. The advantages and disadvantages of these automated methods are pointed out. Using these ice velocity field estimates it is possible to construct one sea-ice image from the other member of the pair. Comparing the reconstructed image with the observed image, errors in the estimated velocity field can be recognized and a useful probable error display created automatically to accompany ice velocity estimates. It is suggested that this error display may be useful in segmenting the sea ice observed into regions that move as rigid plates of significant ice velocity shear and distortion.
Document ID
19880037707
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Vesecky, John F. (Stanford Univ. CA, United States)
Samadani, Ramin (Stanford Univ. CA, United States)
Smith, Martha P. (Stanford Univ. CA, United States)
Daida, Jason M. (Stanford Univ. CA, United States)
Bracewell, Ronald N. (Stanford University CA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Publication Information
Publication: IEEE Transactions on Geoscience and Remote Sensing
Volume: 26
ISSN: 0196-2892
Subject Category
OCEANOGRAPHY
Funding Number(s)
CONTRACT_GRANT: NAGW-419
Distribution Limits
Public
Copyright
Other