Sea ice motion measurements from Seasat SAR images
Data from the Seasat synthetic aperture radar (SAR) experiment are analyzed in order to determine the accuracy of this information for mapping the distribution of sea ice and its motion. Data from observations of sea ice in the Beaufort Sea from seven sequential orbits of the satellite were selected...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19830043095 2023-05-15T15:40:34+02:00 Sea ice motion measurements from Seasat SAR images Leberl, F. Raggam, J. Elachi, C. Campbell, W. J. Unclassified, Unlimited, Publicly available Feb 28, 1983 http://ntrs.nasa.gov/search.jsp?R=19830043095 unknown http://ntrs.nasa.gov/search.jsp?R=19830043095 Accession ID: 83A24313 Copyright Other Sources 48 Journal of Geophysical Research; 88; Feb. 28 1983 ftnasantrs 2012-02-15T15:27:04Z Data from the Seasat synthetic aperture radar (SAR) experiment are analyzed in order to determine the accuracy of this information for mapping the distribution of sea ice and its motion. Data from observations of sea ice in the Beaufort Sea from seven sequential orbits of the satellite were selected to study the capabilities and limitations of spaceborne radar application to sea-ice mapping. Results show that there is no difficulty in identifying homologue ice features on sequential radar images and the accuracy is entirely controlled by the accuracy of the orbit data and the geometric calibration of the sensor. Conventional radargrammetric methods are found to serve well for satellite radar ice mapping, while ground control points can be used to calibrate the ice location and motion measurements in the cases where orbit data and sensor calibration are lacking. The ice motion was determined to be approximately 6.4 + or - 0.5 km/day. In addition, the accuracy of pixel location was found over land areas. The use of one control point in 10,000 sq km produced an accuracy of about + or 150 m, while with a higher density of control points (7 in 1000 sq km) the location accuracy improves to the image resolution of + or - 25 m. This is found to be applicable for both optical and digital data. Other/Unknown Material Beaufort Sea Sea ice NASA Technical Reports Server (NTRS) |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
language |
unknown |
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48 |
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48 Leberl, F. Raggam, J. Elachi, C. Campbell, W. J. Sea ice motion measurements from Seasat SAR images |
topic_facet |
48 |
description |
Data from the Seasat synthetic aperture radar (SAR) experiment are analyzed in order to determine the accuracy of this information for mapping the distribution of sea ice and its motion. Data from observations of sea ice in the Beaufort Sea from seven sequential orbits of the satellite were selected to study the capabilities and limitations of spaceborne radar application to sea-ice mapping. Results show that there is no difficulty in identifying homologue ice features on sequential radar images and the accuracy is entirely controlled by the accuracy of the orbit data and the geometric calibration of the sensor. Conventional radargrammetric methods are found to serve well for satellite radar ice mapping, while ground control points can be used to calibrate the ice location and motion measurements in the cases where orbit data and sensor calibration are lacking. The ice motion was determined to be approximately 6.4 + or - 0.5 km/day. In addition, the accuracy of pixel location was found over land areas. The use of one control point in 10,000 sq km produced an accuracy of about + or 150 m, while with a higher density of control points (7 in 1000 sq km) the location accuracy improves to the image resolution of + or - 25 m. This is found to be applicable for both optical and digital data. |
format |
Other/Unknown Material |
author |
Leberl, F. Raggam, J. Elachi, C. Campbell, W. J. |
author_facet |
Leberl, F. Raggam, J. Elachi, C. Campbell, W. J. |
author_sort |
Leberl, F. |
title |
Sea ice motion measurements from Seasat SAR images |
title_short |
Sea ice motion measurements from Seasat SAR images |
title_full |
Sea ice motion measurements from Seasat SAR images |
title_fullStr |
Sea ice motion measurements from Seasat SAR images |
title_full_unstemmed |
Sea ice motion measurements from Seasat SAR images |
title_sort |
sea ice motion measurements from seasat sar images |
publishDate |
1983 |
url |
http://ntrs.nasa.gov/search.jsp?R=19830043095 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Beaufort Sea Sea ice |
genre_facet |
Beaufort Sea Sea ice |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19830043095 Accession ID: 83A24313 |
op_rights |
Copyright |
_version_ |
1766373062799785984 |