A note on digital elevation model smoothing and driving stresses
Ice-flow fields, including the driving stress, provide important information on the current state and evolution of Antarctic and Greenland ice-sheet dynamics. However, computation of flow fields from continent-scale DEMs requires the use of smoothing functions and scales, the choice of which can be...
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/3498 2024-06-23T07:47:11+00:00 A note on digital elevation model smoothing and driving stresses McCormack, Felicity S. Roberts, Jason L. Jong, Lenneke M. Young, Duncan A. Beem, Lucas H. 2019-03-28 application/pdf text/html application/epub+zip application/xml https://polarresearch.net/index.php/polar/article/view/3498 https://doi.org/10.33265/polar.v38.3498 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/3498/9172 https://polarresearch.net/index.php/polar/article/view/3498/9173 https://polarresearch.net/index.php/polar/article/view/3498/9174 https://polarresearch.net/index.php/polar/article/view/3498/9176 https://polarresearch.net/index.php/polar/article/view/3498 doi:10.33265/polar.v38.3498 Polar Research; Vol 38 (2019) 1751-8369 ice-flow direction smoothing filter Antarctic Ice Sheet ice-sheet dynamics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftjpolarres https://doi.org/10.33265/polar.v38.3498 2024-06-13T23:33:00Z Ice-flow fields, including the driving stress, provide important information on the current state and evolution of Antarctic and Greenland ice-sheet dynamics. However, computation of flow fields from continent-scale DEMs requires the use of smoothing functions and scales, the choice of which can be ad hoc. This study evaluates smoothing functions and scales for robust calculations of driving stress from Antarctic DEMs. Our approach compares a variety of filters and scales for their capacity to minimize the residual between predicted and observed flow direction fields. We find that a spatially varying triangular filter with a width of 8–10 ice thicknesses provides the closest match between the observed and predicted flow direction fields. We use the predicted flow direction fields to highlight artefacts in observed Antarctic velocities, demonstrating that comparison of multiple observational data sets has utility for quality control of continent-scale data sets. Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet Polar Research Polar Research Antarctic Greenland Polar Research 38 0 |
institution |
Open Polar |
collection |
Polar Research |
op_collection_id |
ftjpolarres |
language |
English |
topic |
ice-flow direction smoothing filter Antarctic Ice Sheet ice-sheet dynamics |
spellingShingle |
ice-flow direction smoothing filter Antarctic Ice Sheet ice-sheet dynamics McCormack, Felicity S. Roberts, Jason L. Jong, Lenneke M. Young, Duncan A. Beem, Lucas H. A note on digital elevation model smoothing and driving stresses |
topic_facet |
ice-flow direction smoothing filter Antarctic Ice Sheet ice-sheet dynamics |
description |
Ice-flow fields, including the driving stress, provide important information on the current state and evolution of Antarctic and Greenland ice-sheet dynamics. However, computation of flow fields from continent-scale DEMs requires the use of smoothing functions and scales, the choice of which can be ad hoc. This study evaluates smoothing functions and scales for robust calculations of driving stress from Antarctic DEMs. Our approach compares a variety of filters and scales for their capacity to minimize the residual between predicted and observed flow direction fields. We find that a spatially varying triangular filter with a width of 8–10 ice thicknesses provides the closest match between the observed and predicted flow direction fields. We use the predicted flow direction fields to highlight artefacts in observed Antarctic velocities, demonstrating that comparison of multiple observational data sets has utility for quality control of continent-scale data sets. |
format |
Article in Journal/Newspaper |
author |
McCormack, Felicity S. Roberts, Jason L. Jong, Lenneke M. Young, Duncan A. Beem, Lucas H. |
author_facet |
McCormack, Felicity S. Roberts, Jason L. Jong, Lenneke M. Young, Duncan A. Beem, Lucas H. |
author_sort |
McCormack, Felicity S. |
title |
A note on digital elevation model smoothing and driving stresses |
title_short |
A note on digital elevation model smoothing and driving stresses |
title_full |
A note on digital elevation model smoothing and driving stresses |
title_fullStr |
A note on digital elevation model smoothing and driving stresses |
title_full_unstemmed |
A note on digital elevation model smoothing and driving stresses |
title_sort |
note on digital elevation model smoothing and driving stresses |
publisher |
Norwegian Polar Institute |
publishDate |
2019 |
url |
https://polarresearch.net/index.php/polar/article/view/3498 https://doi.org/10.33265/polar.v38.3498 |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Ice Sheet Polar Research |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet Polar Research |
op_source |
Polar Research; Vol 38 (2019) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/3498/9172 https://polarresearch.net/index.php/polar/article/view/3498/9173 https://polarresearch.net/index.php/polar/article/view/3498/9174 https://polarresearch.net/index.php/polar/article/view/3498/9176 https://polarresearch.net/index.php/polar/article/view/3498 doi:10.33265/polar.v38.3498 |
op_doi |
https://doi.org/10.33265/polar.v38.3498 |
container_title |
Polar Research |
container_volume |
38 |
container_issue |
0 |
_version_ |
1802651268768858112 |