Estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to Humboldt Glacier, Greenland
Abstract Satellite radar interferometry provides glaciologists with an important new tool for determining the motion and topography of large ice sheets. We examine the sources of error in interferometrically derived ice-motion measurements, including those errors due to inaccurate estimates of the i...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1996
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0022143000003543 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003543 |
id |
crcambridgeupr:10.1017/s0022143000003543 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0022143000003543 2024-09-15T18:07:43+00:00 Estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to Humboldt Glacier, Greenland Joughin, Ian Kwok, Ron Fahnestock, Mark 1996 http://dx.doi.org/10.1017/s0022143000003543 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003543 en eng Cambridge University Press (CUP) Journal of Glaciology volume 42, issue 142, page 564-575 ISSN 0022-1430 1727-5652 journal-article 1996 crcambridgeupr https://doi.org/10.1017/s0022143000003543 2024-08-28T04:03:43Z Abstract Satellite radar interferometry provides glaciologists with an important new tool for determining the motion and topography of large ice sheets. We examine the sources of error in interferometrically derived ice-motion measurements, including those errors due to inaccurate estimates of the interfero-metric baseline. Several simulations are used to assess baseline accuracy in terms of tie-point error and the number and distribution of tie points. These results give insight into how best to select tie points, and also demonstrate the level of accuracy that can be achieved. Examination of two representative cases likely to occur in mapping ice-sheet motion leads to the conclusion that with adequate tie-point information ice velocity can be measured accurately to within a few meters per year. A method to correct horizontal velocity estimates for the effect of vertical displacement using surface slopes is also developed. Finally, we estimate the single-component velocity field for an area on Humboldt Glacier, northern Greenland, using interferograms formed from ERS-1 SAR image. We estimatŠµ that these velocity measurements are accurate to within 2.3 m year 1 . Article in Journal/Newspaper glacier Greenland Humboldt Glacier Ice Sheet Journal of Glaciology Cambridge University Press Journal of Glaciology 42 142 564 575 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Satellite radar interferometry provides glaciologists with an important new tool for determining the motion and topography of large ice sheets. We examine the sources of error in interferometrically derived ice-motion measurements, including those errors due to inaccurate estimates of the interfero-metric baseline. Several simulations are used to assess baseline accuracy in terms of tie-point error and the number and distribution of tie points. These results give insight into how best to select tie points, and also demonstrate the level of accuracy that can be achieved. Examination of two representative cases likely to occur in mapping ice-sheet motion leads to the conclusion that with adequate tie-point information ice velocity can be measured accurately to within a few meters per year. A method to correct horizontal velocity estimates for the effect of vertical displacement using surface slopes is also developed. Finally, we estimate the single-component velocity field for an area on Humboldt Glacier, northern Greenland, using interferograms formed from ERS-1 SAR image. We estimatŠµ that these velocity measurements are accurate to within 2.3 m year 1 . |
format |
Article in Journal/Newspaper |
author |
Joughin, Ian Kwok, Ron Fahnestock, Mark |
spellingShingle |
Joughin, Ian Kwok, Ron Fahnestock, Mark Estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to Humboldt Glacier, Greenland |
author_facet |
Joughin, Ian Kwok, Ron Fahnestock, Mark |
author_sort |
Joughin, Ian |
title |
Estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to Humboldt Glacier, Greenland |
title_short |
Estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to Humboldt Glacier, Greenland |
title_full |
Estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to Humboldt Glacier, Greenland |
title_fullStr |
Estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to Humboldt Glacier, Greenland |
title_full_unstemmed |
Estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to Humboldt Glacier, Greenland |
title_sort |
estimation of ice-sheet motion using satellite radar interferometry: method and error analysis with application to humboldt glacier, greenland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1017/s0022143000003543 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003543 |
genre |
glacier Greenland Humboldt Glacier Ice Sheet Journal of Glaciology |
genre_facet |
glacier Greenland Humboldt Glacier Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 42, issue 142, page 564-575 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000003543 |
container_title |
Journal of Glaciology |
container_volume |
42 |
container_issue |
142 |
container_start_page |
564 |
op_container_end_page |
575 |
_version_ |
1810445090641936384 |