Interferometric swath processing of Cryosat data for glacial ice topography
We have derived digital elevation models (DEMs) over the western part of the Devon Ice Cap in Nunavut, Canada, using "swath processing" of interferometric data collected by Cryosat between February 2011 and January 2012. With the standard ESA (European Space Agency) SARIn (synthetic apertu...
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ftdoajarticles:oai:doaj.org/article:56ba8b64a54b41b98b9a0868a0ba071a 2023-05-15T16:38:18+02:00 Interferometric swath processing of Cryosat data for glacial ice topography L. Gray D. Burgess L. Copland R. Cullen N. Galin R. Hawley V. Helm 2013-12-01T00:00:00Z https://doi.org/10.5194/tc-7-1857-2013 https://doaj.org/article/56ba8b64a54b41b98b9a0868a0ba071a EN eng Copernicus Publications http://www.the-cryosphere.net/7/1857/2013/tc-7-1857-2013.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-7-1857-2013 https://doaj.org/article/56ba8b64a54b41b98b9a0868a0ba071a The Cryosphere, Vol 7, Iss 6, Pp 1857-1867 (2013) Environmental sciences GE1-350 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/tc-7-1857-2013 2022-12-31T12:05:20Z We have derived digital elevation models (DEMs) over the western part of the Devon Ice Cap in Nunavut, Canada, using "swath processing" of interferometric data collected by Cryosat between February 2011 and January 2012. With the standard ESA (European Space Agency) SARIn (synthetic aperture radar interferometry) level 2 (L2) data product, the interferometric mode is used to map the cross-track position and elevation of the "point-of-closest-approach" (POCA) in sloping glacial terrain. However, in this work we explore the extent to which the phase of the returns in the intermediate L1b product can also be used to map the heights of time-delayed footprints beyond the POCA. We show that there is a range of average cross-track slopes (~ 0.5 to ~ 2°) for which the returns will be dominated by those beneath the satellite in the main beam of the antenna so that the resulting interferometric phase allows mapping of heights in the delayed range window beyond the POCA. In this way a swath of elevation data is mapped, allowing the creation of DEMs from a sequence of L1b SARIn Cryosat data takes. Comparison of the Devon results with airborne scanning laser data showed a mean difference of order 1 m with a standard deviation of about 1 m. The limitations of swath processing, which generates almost 2 orders of magnitude more data than traditional radar altimetry, are explored through simulation, and the strengths and weaknesses of the technique are discussed. Article in Journal/Newspaper Ice cap Nunavut The Cryosphere Directory of Open Access Journals: DOAJ Articles Canada Devon Ice Cap ENVELOPE(-82.499,-82.499,75.335,75.335) Nunavut The Cryosphere 7 6 1857 1867 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 L. Gray D. Burgess L. Copland R. Cullen N. Galin R. Hawley V. Helm Interferometric swath processing of Cryosat data for glacial ice topography |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
We have derived digital elevation models (DEMs) over the western part of the Devon Ice Cap in Nunavut, Canada, using "swath processing" of interferometric data collected by Cryosat between February 2011 and January 2012. With the standard ESA (European Space Agency) SARIn (synthetic aperture radar interferometry) level 2 (L2) data product, the interferometric mode is used to map the cross-track position and elevation of the "point-of-closest-approach" (POCA) in sloping glacial terrain. However, in this work we explore the extent to which the phase of the returns in the intermediate L1b product can also be used to map the heights of time-delayed footprints beyond the POCA. We show that there is a range of average cross-track slopes (~ 0.5 to ~ 2°) for which the returns will be dominated by those beneath the satellite in the main beam of the antenna so that the resulting interferometric phase allows mapping of heights in the delayed range window beyond the POCA. In this way a swath of elevation data is mapped, allowing the creation of DEMs from a sequence of L1b SARIn Cryosat data takes. Comparison of the Devon results with airborne scanning laser data showed a mean difference of order 1 m with a standard deviation of about 1 m. The limitations of swath processing, which generates almost 2 orders of magnitude more data than traditional radar altimetry, are explored through simulation, and the strengths and weaknesses of the technique are discussed. |
format |
Article in Journal/Newspaper |
author |
L. Gray D. Burgess L. Copland R. Cullen N. Galin R. Hawley V. Helm |
author_facet |
L. Gray D. Burgess L. Copland R. Cullen N. Galin R. Hawley V. Helm |
author_sort |
L. Gray |
title |
Interferometric swath processing of Cryosat data for glacial ice topography |
title_short |
Interferometric swath processing of Cryosat data for glacial ice topography |
title_full |
Interferometric swath processing of Cryosat data for glacial ice topography |
title_fullStr |
Interferometric swath processing of Cryosat data for glacial ice topography |
title_full_unstemmed |
Interferometric swath processing of Cryosat data for glacial ice topography |
title_sort |
interferometric swath processing of cryosat data for glacial ice topography |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/tc-7-1857-2013 https://doaj.org/article/56ba8b64a54b41b98b9a0868a0ba071a |
long_lat |
ENVELOPE(-82.499,-82.499,75.335,75.335) |
geographic |
Canada Devon Ice Cap Nunavut |
geographic_facet |
Canada Devon Ice Cap Nunavut |
genre |
Ice cap Nunavut The Cryosphere |
genre_facet |
Ice cap Nunavut The Cryosphere |
op_source |
The Cryosphere, Vol 7, Iss 6, Pp 1857-1867 (2013) |
op_relation |
http://www.the-cryosphere.net/7/1857/2013/tc-7-1857-2013.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-7-1857-2013 https://doaj.org/article/56ba8b64a54b41b98b9a0868a0ba071a |
op_doi |
https://doi.org/10.5194/tc-7-1857-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
6 |
container_start_page |
1857 |
op_container_end_page |
1867 |
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1766028583341391872 |