A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data
In this paper, a new high-resolution elevation model of Greenland, including the ice sheet as well as the ice free regions, is presented. It is the first published full coverage model, computed with an average resolution of 2 km and providing an unprecedented degree of detail. The topography is mode...
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ftdtupubl:oai:pure.atira.dk:publications/b95f8a37-8fdb-4733-9fdd-348084d2fdbc 2024-09-15T18:09:27+00:00 A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data Ekholm, Simon 1996 https://orbit.dtu.dk/en/publications/b95f8a37-8fdb-4733-9fdd-348084d2fdbc eng eng https://orbit.dtu.dk/en/publications/b95f8a37-8fdb-4733-9fdd-348084d2fdbc info:eu-repo/semantics/restrictedAccess Ekholm , S 1996 , ' A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data ' , Journal of Geophysical Research-solid Earth , vol. 101 , no. B10 , pp. 21961-21972 . article 1996 ftdtupubl 2024-07-15T23:49:09Z In this paper, a new high-resolution elevation model of Greenland, including the ice sheet as well as the ice free regions, is presented. It is the first published full coverage model, computed with an average resolution of 2 km and providing an unprecedented degree of detail. The topography is modeled from a wide selection of data sources, including satellite radar altimetry from Geosat and ERS 1, airborne radar altimetry and airborne laser altimetry over the ice sheet, and photogrammetric and manual map scannings in the ice free region. The ice sheet model accuracy is evaluated by omitting airborne laser data from the analysis and treating them as ground truth observations. The mean accuracy of the ice sheet elevations is estimated to be 12-13 m, and it is found that on surfaces of a slope between 0.2 degrees and 0.8 degrees, corresponding to approximately 50% of the ice sheet, the model presents a 40% improvement over models based on satellite altimetry alone. On coastal bedrock, the model is compared with stereo triangulated reference points, and it is found that the model accuracy is of the order of 25-35 m in areas covered by stereo photogrammetry scannings and between 200 and 250 m elsewhere. Article in Journal/Newspaper Greenland Ice Sheet Technical University of Denmark: DTU Orbit |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
In this paper, a new high-resolution elevation model of Greenland, including the ice sheet as well as the ice free regions, is presented. It is the first published full coverage model, computed with an average resolution of 2 km and providing an unprecedented degree of detail. The topography is modeled from a wide selection of data sources, including satellite radar altimetry from Geosat and ERS 1, airborne radar altimetry and airborne laser altimetry over the ice sheet, and photogrammetric and manual map scannings in the ice free region. The ice sheet model accuracy is evaluated by omitting airborne laser data from the analysis and treating them as ground truth observations. The mean accuracy of the ice sheet elevations is estimated to be 12-13 m, and it is found that on surfaces of a slope between 0.2 degrees and 0.8 degrees, corresponding to approximately 50% of the ice sheet, the model presents a 40% improvement over models based on satellite altimetry alone. On coastal bedrock, the model is compared with stereo triangulated reference points, and it is found that the model accuracy is of the order of 25-35 m in areas covered by stereo photogrammetry scannings and between 200 and 250 m elsewhere. |
format |
Article in Journal/Newspaper |
author |
Ekholm, Simon |
spellingShingle |
Ekholm, Simon A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data |
author_facet |
Ekholm, Simon |
author_sort |
Ekholm, Simon |
title |
A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data |
title_short |
A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data |
title_full |
A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data |
title_fullStr |
A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data |
title_full_unstemmed |
A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data |
title_sort |
full coverage, high-resolution, topographic model of greenland computed from a variety of digital elevation data |
publishDate |
1996 |
url |
https://orbit.dtu.dk/en/publications/b95f8a37-8fdb-4733-9fdd-348084d2fdbc |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Ekholm , S 1996 , ' A full coverage, high-resolution, topographic model of Greenland computed from a variety of digital elevation data ' , Journal of Geophysical Research-solid Earth , vol. 101 , no. B10 , pp. 21961-21972 . |
op_relation |
https://orbit.dtu.dk/en/publications/b95f8a37-8fdb-4733-9fdd-348084d2fdbc |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1810447008142458880 |