A new digital elevation model (DEM) dataset of the entire Antarctic continent derived from ICESat-2
Antarctic digital elevation models (DEMs) are essential for fieldwork, ice motion tracking and the numerical modelling of the ice sheet. In the past 30 years, several Antarctic DEMs derived from satellite data have been published. However, these DEMs either have coarse spatial resolution or aggregat...
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ftdoajarticles:oai:doaj.org/article:87cd15d2bc524136a17f6e554129153d 2023-05-15T13:42:27+02:00 A new digital elevation model (DEM) dataset of the entire Antarctic continent derived from ICESat-2 X. Shen C.-Q. Ke Y. Fan L. Drolma 2022-07-01T00:00:00Z https://doi.org/10.5194/essd-14-3075-2022 https://doaj.org/article/87cd15d2bc524136a17f6e554129153d EN eng Copernicus Publications https://essd.copernicus.org/articles/14/3075/2022/essd-14-3075-2022.pdf https://doaj.org/toc/1866-3508 https://doaj.org/toc/1866-3516 doi:10.5194/essd-14-3075-2022 1866-3508 1866-3516 https://doaj.org/article/87cd15d2bc524136a17f6e554129153d Earth System Science Data, Vol 14, Pp 3075-3089 (2022) Environmental sciences GE1-350 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/essd-14-3075-2022 2022-12-31T01:24:15Z Antarctic digital elevation models (DEMs) are essential for fieldwork, ice motion tracking and the numerical modelling of the ice sheet. In the past 30 years, several Antarctic DEMs derived from satellite data have been published. However, these DEMs either have coarse spatial resolution or aggregate observations spanning several years, which limit their further scientific applications. In this study, the new generation satellite laser altimeter Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2) is used to generate a new Antarctic DEM for both the ice sheet and ice shelves. Approximately 4.69 × 10 9 ICESat-2 measurement points from November 2018 to November 2019 are used to estimate surface elevations at resolutions of 500 m and 1 km based on a spatiotemporal fitting method. Approximately 74 % of Antarctica is observed and the remaining observation gaps are interpolated using the normal kriging method. The DEM is formed from the estimated elevations in 500 m and 1 km grid cells, and is finally posted at the resolution of 500 m. National Aeronautics and Space Administration (NASA) Operation IceBridge (OIB) airborne data are used to evaluate the generated Antarctic DEM (hereafter called the ICESat-2 DEM) in individual Antarctic regions and surface types. Overall, a median bias of − 0.19 m and a root-mean-square deviation of 10.83 m result from approximately 5.2 × 10 6 OIB measurement points. The accuracy and uncertainty of the ICESat-2 DEM vary in relation to the surface slope and roughness, and more reliable estimates are found in the flat ice sheet interior. The ICESat-2 DEM is comparable to other DEMs derived from altimetry, stereophotogrammetry and interferometry. Similar results are found when comparing to elevation measurements from kinematic Global Navigation Satellite System (GNSS) (GPS and the Russian GLONASS) transects. The elevations of high accuracy and ability of annual updates make the ICESat-2 DEM an addition to the existing Antarctic DEM groups, and it can be further used for other scientific ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelves NASA Operation IceBridge (OIB) Directory of Open Access Journals: DOAJ Articles Antarctic Earth System Science Data 14 7 3075 3089 |
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 X. Shen C.-Q. Ke Y. Fan L. Drolma A new digital elevation model (DEM) dataset of the entire Antarctic continent derived from ICESat-2 |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Antarctic digital elevation models (DEMs) are essential for fieldwork, ice motion tracking and the numerical modelling of the ice sheet. In the past 30 years, several Antarctic DEMs derived from satellite data have been published. However, these DEMs either have coarse spatial resolution or aggregate observations spanning several years, which limit their further scientific applications. In this study, the new generation satellite laser altimeter Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2) is used to generate a new Antarctic DEM for both the ice sheet and ice shelves. Approximately 4.69 × 10 9 ICESat-2 measurement points from November 2018 to November 2019 are used to estimate surface elevations at resolutions of 500 m and 1 km based on a spatiotemporal fitting method. Approximately 74 % of Antarctica is observed and the remaining observation gaps are interpolated using the normal kriging method. The DEM is formed from the estimated elevations in 500 m and 1 km grid cells, and is finally posted at the resolution of 500 m. National Aeronautics and Space Administration (NASA) Operation IceBridge (OIB) airborne data are used to evaluate the generated Antarctic DEM (hereafter called the ICESat-2 DEM) in individual Antarctic regions and surface types. Overall, a median bias of − 0.19 m and a root-mean-square deviation of 10.83 m result from approximately 5.2 × 10 6 OIB measurement points. The accuracy and uncertainty of the ICESat-2 DEM vary in relation to the surface slope and roughness, and more reliable estimates are found in the flat ice sheet interior. The ICESat-2 DEM is comparable to other DEMs derived from altimetry, stereophotogrammetry and interferometry. Similar results are found when comparing to elevation measurements from kinematic Global Navigation Satellite System (GNSS) (GPS and the Russian GLONASS) transects. The elevations of high accuracy and ability of annual updates make the ICESat-2 DEM an addition to the existing Antarctic DEM groups, and it can be further used for other scientific ... |
format |
Article in Journal/Newspaper |
author |
X. Shen C.-Q. Ke Y. Fan L. Drolma |
author_facet |
X. Shen C.-Q. Ke Y. Fan L. Drolma |
author_sort |
X. Shen |
title |
A new digital elevation model (DEM) dataset of the entire Antarctic continent derived from ICESat-2 |
title_short |
A new digital elevation model (DEM) dataset of the entire Antarctic continent derived from ICESat-2 |
title_full |
A new digital elevation model (DEM) dataset of the entire Antarctic continent derived from ICESat-2 |
title_fullStr |
A new digital elevation model (DEM) dataset of the entire Antarctic continent derived from ICESat-2 |
title_full_unstemmed |
A new digital elevation model (DEM) dataset of the entire Antarctic continent derived from ICESat-2 |
title_sort |
new digital elevation model (dem) dataset of the entire antarctic continent derived from icesat-2 |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/essd-14-3075-2022 https://doaj.org/article/87cd15d2bc524136a17f6e554129153d |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves NASA Operation IceBridge (OIB) |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves NASA Operation IceBridge (OIB) |
op_source |
Earth System Science Data, Vol 14, Pp 3075-3089 (2022) |
op_relation |
https://essd.copernicus.org/articles/14/3075/2022/essd-14-3075-2022.pdf https://doaj.org/toc/1866-3508 https://doaj.org/toc/1866-3516 doi:10.5194/essd-14-3075-2022 1866-3508 1866-3516 https://doaj.org/article/87cd15d2bc524136a17f6e554129153d |
op_doi |
https://doi.org/10.5194/essd-14-3075-2022 |
container_title |
Earth System Science Data |
container_volume |
14 |
container_issue |
7 |
container_start_page |
3075 |
op_container_end_page |
3089 |
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1766168000353796096 |