A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates
We have developed a new digital elevation model (DEM) of Antarctica from a combination of satellite radar and laser altimeter data. Here, we assess the accuracy of the DEM by comparison with airborne altimeter data from four campaigns covering a wide range of surface slopes and ice sheet regions. Ro...
Published in: | The Cryosphere |
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Language: | English |
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2009
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Online Access: | https://hdl.handle.net/1983/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 https://research-information.bris.ac.uk/en/publications/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 https://doi.org/10.5194/tc-3-113-2009 |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 2024-04-28T08:02:44+00:00 A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates Griggs, JA Bamber, JL 2009-05 https://hdl.handle.net/1983/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 https://research-information.bris.ac.uk/en/publications/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 https://doi.org/10.5194/tc-3-113-2009 eng eng https://research-information.bris.ac.uk/en/publications/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 info:eu-repo/semantics/restrictedAccess Griggs , JA & Bamber , JL 2009 , ' A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates ' , Cryosphere , vol. 3 , pp. 113 - 123 . https://doi.org/10.5194/tc-3-113-2009 article 2009 ftubristolcris https://doi.org/10.5194/tc-3-113-2009 2024-04-03T15:06:37Z We have developed a new digital elevation model (DEM) of Antarctica from a combination of satellite radar and laser altimeter data. Here, we assess the accuracy of the DEM by comparison with airborne altimeter data from four campaigns covering a wide range of surface slopes and ice sheet regions. Root mean squared (RMS) differences varied from 4.75 m, when compared to a densely gridded airborne dataset over the Siple Coast region of West Antarctica to 33.78 m when compared to a more limited dataset over the Antarctic Peninsula where surface slopes are high and the across track spacing of the satellite data is relatively large. The airborne data sets were employed to produce an error map for the DEM by developing a multiple linear regression model based on the variables known to influence errors in the DEM. Errors were found to correlate highly with surface slope, roughness and density of satellite data points. Errors ranged from typically ~1 m over the ice shelves to between about 2 and 6 m for the majority of the grounded ice sheet. In the steeply sloping margins, along the Peninsula and mountain ranges the estimated error is several tens of metres. Less than 2% of the area covered by the satellite data had an estimated random error greater than 20 m. We have developed a new digital elevation model (DEM) of Antarctica from a combination of satellite radar and laser altimeter data. Here, we assess the accuracy of the DEM by comparison with airborne altimeter data from four campaigns covering a wide range of surface slopes and ice sheet regions. Root mean squared (RMS) differences varied from 4.75 m, when compared to a densely gridded airborne dataset over the Siple Coast region of West Antarctica to 33.78 m when compared to a more limited dataset over the Antarctic Peninsula where surface slopes are high and the across track spacing of the satellite data is relatively large. The airborne data sets were employed to produce an error map for the DEM by developing a multiple linear regression model based on the ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelves West Antarctica University of Bristol: Bristol Research The Cryosphere 3 1 113 123 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
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ftubristolcris |
language |
English |
description |
We have developed a new digital elevation model (DEM) of Antarctica from a combination of satellite radar and laser altimeter data. Here, we assess the accuracy of the DEM by comparison with airborne altimeter data from four campaigns covering a wide range of surface slopes and ice sheet regions. Root mean squared (RMS) differences varied from 4.75 m, when compared to a densely gridded airborne dataset over the Siple Coast region of West Antarctica to 33.78 m when compared to a more limited dataset over the Antarctic Peninsula where surface slopes are high and the across track spacing of the satellite data is relatively large. The airborne data sets were employed to produce an error map for the DEM by developing a multiple linear regression model based on the variables known to influence errors in the DEM. Errors were found to correlate highly with surface slope, roughness and density of satellite data points. Errors ranged from typically ~1 m over the ice shelves to between about 2 and 6 m for the majority of the grounded ice sheet. In the steeply sloping margins, along the Peninsula and mountain ranges the estimated error is several tens of metres. Less than 2% of the area covered by the satellite data had an estimated random error greater than 20 m. We have developed a new digital elevation model (DEM) of Antarctica from a combination of satellite radar and laser altimeter data. Here, we assess the accuracy of the DEM by comparison with airborne altimeter data from four campaigns covering a wide range of surface slopes and ice sheet regions. Root mean squared (RMS) differences varied from 4.75 m, when compared to a densely gridded airborne dataset over the Siple Coast region of West Antarctica to 33.78 m when compared to a more limited dataset over the Antarctic Peninsula where surface slopes are high and the across track spacing of the satellite data is relatively large. The airborne data sets were employed to produce an error map for the DEM by developing a multiple linear regression model based on the ... |
format |
Article in Journal/Newspaper |
author |
Griggs, JA Bamber, JL |
spellingShingle |
Griggs, JA Bamber, JL A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates |
author_facet |
Griggs, JA Bamber, JL |
author_sort |
Griggs, JA |
title |
A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates |
title_short |
A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates |
title_full |
A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates |
title_fullStr |
A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates |
title_full_unstemmed |
A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates |
title_sort |
new 1 km digital elevation model of antarctica derived from combined radar and laser data – part 2: validation and error estimates |
publishDate |
2009 |
url |
https://hdl.handle.net/1983/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 https://research-information.bris.ac.uk/en/publications/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 https://doi.org/10.5194/tc-3-113-2009 |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelves West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelves West Antarctica |
op_source |
Griggs , JA & Bamber , JL 2009 , ' A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates ' , Cryosphere , vol. 3 , pp. 113 - 123 . https://doi.org/10.5194/tc-3-113-2009 |
op_relation |
https://research-information.bris.ac.uk/en/publications/3bc947b6-6102-4465-aef4-1a8b2d41f4d8 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5194/tc-3-113-2009 |
container_title |
The Cryosphere |
container_volume |
3 |
container_issue |
1 |
container_start_page |
113 |
op_container_end_page |
123 |
_version_ |
1797574022761807872 |