Antarctic Ice Sheet Slope and Aspect Based on ICESAT's Repeat Orbit Measurement
Accurate information of ice sheet surface slope is essential for estimating elevation change by satellite altimetry measurement. A study is carried out to recover surface slope of Antarctic ice sheet from Ice, Cloud and land Elevation Satellite (ICESat) elevation measurements based on repeat orbits....
Main Authors: | , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Digital Commons @ University of South Florida
2017
|
Subjects: | |
Online Access: | https://digitalcommons.usf.edu/geo_studpub/27 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=1027&context=geo_studpub |
id |
ftunisfloridatam:oai:digitalcommons.usf.edu:geo_studpub-1027 |
---|---|
record_format |
openpolar |
spelling |
ftunisfloridatam:oai:digitalcommons.usf.edu:geo_studpub-1027 2023-05-15T13:34:05+02:00 Antarctic Ice Sheet Slope and Aspect Based on ICESAT's Repeat Orbit Measurement Yuan, L. Li, F. Zhang, S. Xie, Surui Xiao, F. Zhu, T. Zhang, Y. 2017-09-01T07:00:00Z application/pdf https://digitalcommons.usf.edu/geo_studpub/27 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=1027&context=geo_studpub unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/geo_studpub/27 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=1027&context=geo_studpub http://creativecommons.org/licenses/by/4.0/ CC-BY School of Geosciences Student Publications Slope aspect Antarctic ice sheet ICESat repeat orbit Earth Sciences article 2017 ftunisfloridatam 2021-10-09T07:50:35Z Accurate information of ice sheet surface slope is essential for estimating elevation change by satellite altimetry measurement. A study is carried out to recover surface slope of Antarctic ice sheet from Ice, Cloud and land Elevation Satellite (ICESat) elevation measurements based on repeat orbits. ICESat provides repeat ground tracks within 200 meters in cross-track direction and 170 meters in along-track direction for most areas of Antarctic ice sheet. Both cross-track and along-track surface slopes could be obtained by adjacent repeat ground tracks. Combining those measurements yields a surface slope model with resolution of approximately 200 meters. An algorithm considering elevation change is developed to estimate the surface slope of Antarctic ice sheet. Three Antarctic Digital Elevation Models (DEMs) were used to calculate surface slopes. The surface slopes from DEMs are compared with estimates by using in situ GPS data in Dome A, the summit of Antarctic ice sheet. Our results reveal an average surface slope difference of 0.02 degree in Dome A. High resolution remote sensing images are also used in comparing the results derived from other DEMs and this paper. The comparison implies that our results have a slightly better coherence with GPS observation than results from DEMs, but our results provide more details and perform higher accuracy in coastal areas because of the higher resolution for ICESat measurements. Ice divides are estimated based on the aspect, and are weakly consistent with ice divides from other method in coastal regions. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Digital Commons University of South Florida (USF) Antarctic |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Slope aspect Antarctic ice sheet ICESat repeat orbit Earth Sciences |
spellingShingle |
Slope aspect Antarctic ice sheet ICESat repeat orbit Earth Sciences Yuan, L. Li, F. Zhang, S. Xie, Surui Xiao, F. Zhu, T. Zhang, Y. Antarctic Ice Sheet Slope and Aspect Based on ICESAT's Repeat Orbit Measurement |
topic_facet |
Slope aspect Antarctic ice sheet ICESat repeat orbit Earth Sciences |
description |
Accurate information of ice sheet surface slope is essential for estimating elevation change by satellite altimetry measurement. A study is carried out to recover surface slope of Antarctic ice sheet from Ice, Cloud and land Elevation Satellite (ICESat) elevation measurements based on repeat orbits. ICESat provides repeat ground tracks within 200 meters in cross-track direction and 170 meters in along-track direction for most areas of Antarctic ice sheet. Both cross-track and along-track surface slopes could be obtained by adjacent repeat ground tracks. Combining those measurements yields a surface slope model with resolution of approximately 200 meters. An algorithm considering elevation change is developed to estimate the surface slope of Antarctic ice sheet. Three Antarctic Digital Elevation Models (DEMs) were used to calculate surface slopes. The surface slopes from DEMs are compared with estimates by using in situ GPS data in Dome A, the summit of Antarctic ice sheet. Our results reveal an average surface slope difference of 0.02 degree in Dome A. High resolution remote sensing images are also used in comparing the results derived from other DEMs and this paper. The comparison implies that our results have a slightly better coherence with GPS observation than results from DEMs, but our results provide more details and perform higher accuracy in coastal areas because of the higher resolution for ICESat measurements. Ice divides are estimated based on the aspect, and are weakly consistent with ice divides from other method in coastal regions. |
format |
Article in Journal/Newspaper |
author |
Yuan, L. Li, F. Zhang, S. Xie, Surui Xiao, F. Zhu, T. Zhang, Y. |
author_facet |
Yuan, L. Li, F. Zhang, S. Xie, Surui Xiao, F. Zhu, T. Zhang, Y. |
author_sort |
Yuan, L. |
title |
Antarctic Ice Sheet Slope and Aspect Based on ICESAT's Repeat Orbit Measurement |
title_short |
Antarctic Ice Sheet Slope and Aspect Based on ICESAT's Repeat Orbit Measurement |
title_full |
Antarctic Ice Sheet Slope and Aspect Based on ICESAT's Repeat Orbit Measurement |
title_fullStr |
Antarctic Ice Sheet Slope and Aspect Based on ICESAT's Repeat Orbit Measurement |
title_full_unstemmed |
Antarctic Ice Sheet Slope and Aspect Based on ICESAT's Repeat Orbit Measurement |
title_sort |
antarctic ice sheet slope and aspect based on icesat's repeat orbit measurement |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2017 |
url |
https://digitalcommons.usf.edu/geo_studpub/27 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=1027&context=geo_studpub |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
School of Geosciences Student Publications |
op_relation |
https://digitalcommons.usf.edu/geo_studpub/27 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=1027&context=geo_studpub |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766048758973333504 |