Calculation and Error Analysis of a Digital Elevation Model of Hofsjokull, Iceland from SAR Interferometry
Two ascending European Space Agency (ESA) Earth Resources Satellites (ERS)-1/-2 tandem-mode, synthetic aperture radar (SAR) pairs are used to calculate the surface elevation of Hofsjokull, an ice cap in central Iceland. The motion component of the interferometric phase is calculated using the 30 arc...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20000031720 2023-05-15T16:38:10+02:00 Calculation and Error Analysis of a Digital Elevation Model of Hofsjokull, Iceland from SAR Interferometry Williams, Richard S., Jr. Smith, Laurence C. Hall, Dorothy K. Sigurosson, Oddur Garvin, James B. Barton, Jonathan S. Unclassified, Unlimited, Publicly available [1999] application/pdf http://hdl.handle.net/2060/20000031720 unknown Document ID: 20000031720 http://hdl.handle.net/2060/20000031720 No Copyright CASI Earth Resources and Remote Sensing 56th Eastern Snow Conference; United States 1999 ftnasantrs 2015-03-15T02:45:11Z Two ascending European Space Agency (ESA) Earth Resources Satellites (ERS)-1/-2 tandem-mode, synthetic aperture radar (SAR) pairs are used to calculate the surface elevation of Hofsjokull, an ice cap in central Iceland. The motion component of the interferometric phase is calculated using the 30 arc-second resolution USGS GTOPO30 global digital elevation product and one of the ERS tandem pairs. The topography is then derived by subtracting the motion component from the other tandem pair. In order to assess the accuracy of the resultant digital elevation model (DEM), a geodetic airborne laser-altimetry swath is compared with the elevations derived from the interferometry. The DEM is also compared with elevations derived from a digitized topographic map of the ice cap from the University of Iceland Science Institute. Results show that low temporal correlation is a significant problem for the application of interferometry to small, low-elevation ice caps, even over a one-day repeat interval, and especially at the higher elevations. Results also show that an uncompensated error in the phase, ramping from northwest to southeast, present after tying the DEM to ground-control points, has resulted in a systematic error across the DEM. Other/Unknown Material Ice cap Iceland NASA Technical Reports Server (NTRS) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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unknown |
topic |
Earth Resources and Remote Sensing |
spellingShingle |
Earth Resources and Remote Sensing Williams, Richard S., Jr. Smith, Laurence C. Hall, Dorothy K. Sigurosson, Oddur Garvin, James B. Barton, Jonathan S. Calculation and Error Analysis of a Digital Elevation Model of Hofsjokull, Iceland from SAR Interferometry |
topic_facet |
Earth Resources and Remote Sensing |
description |
Two ascending European Space Agency (ESA) Earth Resources Satellites (ERS)-1/-2 tandem-mode, synthetic aperture radar (SAR) pairs are used to calculate the surface elevation of Hofsjokull, an ice cap in central Iceland. The motion component of the interferometric phase is calculated using the 30 arc-second resolution USGS GTOPO30 global digital elevation product and one of the ERS tandem pairs. The topography is then derived by subtracting the motion component from the other tandem pair. In order to assess the accuracy of the resultant digital elevation model (DEM), a geodetic airborne laser-altimetry swath is compared with the elevations derived from the interferometry. The DEM is also compared with elevations derived from a digitized topographic map of the ice cap from the University of Iceland Science Institute. Results show that low temporal correlation is a significant problem for the application of interferometry to small, low-elevation ice caps, even over a one-day repeat interval, and especially at the higher elevations. Results also show that an uncompensated error in the phase, ramping from northwest to southeast, present after tying the DEM to ground-control points, has resulted in a systematic error across the DEM. |
format |
Other/Unknown Material |
author |
Williams, Richard S., Jr. Smith, Laurence C. Hall, Dorothy K. Sigurosson, Oddur Garvin, James B. Barton, Jonathan S. |
author_facet |
Williams, Richard S., Jr. Smith, Laurence C. Hall, Dorothy K. Sigurosson, Oddur Garvin, James B. Barton, Jonathan S. |
author_sort |
Williams, Richard S., Jr. |
title |
Calculation and Error Analysis of a Digital Elevation Model of Hofsjokull, Iceland from SAR Interferometry |
title_short |
Calculation and Error Analysis of a Digital Elevation Model of Hofsjokull, Iceland from SAR Interferometry |
title_full |
Calculation and Error Analysis of a Digital Elevation Model of Hofsjokull, Iceland from SAR Interferometry |
title_fullStr |
Calculation and Error Analysis of a Digital Elevation Model of Hofsjokull, Iceland from SAR Interferometry |
title_full_unstemmed |
Calculation and Error Analysis of a Digital Elevation Model of Hofsjokull, Iceland from SAR Interferometry |
title_sort |
calculation and error analysis of a digital elevation model of hofsjokull, iceland from sar interferometry |
publishDate |
1999 |
url |
http://hdl.handle.net/2060/20000031720 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Ice cap Iceland |
genre_facet |
Ice cap Iceland |
op_source |
CASI |
op_relation |
Document ID: 20000031720 http://hdl.handle.net/2060/20000031720 |
op_rights |
No Copyright |
_version_ |
1766028455225327616 |