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...
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ftdoajarticles:oai:doaj.org/article:b5125014dd2d4a52bf9027025ab30910 2023-05-15T13:44:19+02:00 A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates J. A. Griggs J. L. Bamber 2009-05-01T00:00:00Z https://doaj.org/article/b5125014dd2d4a52bf9027025ab30910 EN eng Copernicus Publications http://www.the-cryosphere.net/3/113/2009/tc-3-113-2009.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 https://doaj.org/article/b5125014dd2d4a52bf9027025ab30910 The Cryosphere, Vol 3, Iss 1, Pp 113-123 (2009) Environmental sciences GE1-350 Geology QE1-996.5 article 2009 ftdoajarticles 2022-12-31T00:17:58Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelves The Cryosphere West Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula West Antarctica Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Coast ENVELOPE(-155.000,-155.000,-82.000,-82.000) |
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 J. A. Griggs J. L. Bamber A new 1 km digital elevation model of Antarctica derived from combined radar and laser data – Part 2: Validation and error estimates |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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. |
format |
Article in Journal/Newspaper |
author |
J. A. Griggs J. L. Bamber |
author_facet |
J. A. Griggs J. L. Bamber |
author_sort |
J. A. Griggs |
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 |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doaj.org/article/b5125014dd2d4a52bf9027025ab30910 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-155.000,-155.000,-82.000,-82.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula West Antarctica Siple Siple Coast |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula West Antarctica Siple Siple Coast |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelves The Cryosphere West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelves The Cryosphere West Antarctica |
op_source |
The Cryosphere, Vol 3, Iss 1, Pp 113-123 (2009) |
op_relation |
http://www.the-cryosphere.net/3/113/2009/tc-3-113-2009.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 https://doaj.org/article/b5125014dd2d4a52bf9027025ab30910 |
_version_ |
1766200165870338048 |