How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry
<jats:title>Abstract</jats:title><jats:p>Satellite altimetry has been widely used to determine surface elevation changes in polar ice sheets. The original height measurements are irregularly distributed in space and time. Gridded surface elevation changes are commonly derived by re...
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ftzbmed:oai:frl.publisso.de:frl:6468526 2024-01-07T09:43:40+01:00 How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry Strößenreuther, Undine Horwath, Martin Schröder, Ludwig 2020 https://repository.publisso.de/resource/frl:6468526 https://doi.org/10.1007/s11004-019-09851-3 eng eng https://repository.publisso.de/resource/frl:6468526 https://doi.org/10.1007/s11004-019-09851-3 https://creativecommons.org/licenses/by/4.0/ http://lobid.org/resources/99370678379006441#!, 52(4):499-525 Ice sheet Satellite altimetry Article Interpolation Kriging Repeat altimetry Zeitschriftenartikel 2020 ftzbmed https://doi.org/10.1007/s11004-019-09851-3 2023-12-10T23:07:39Z <jats:title>Abstract</jats:title><jats:p>Satellite altimetry has been widely used to determine surface elevation changes in polar ice sheets. The original height measurements are irregularly distributed in space and time. Gridded surface elevation changes are commonly derived by repeat altimetry analysis (RAA) and subsequent spatial interpolation of height change estimates. This article assesses how methodological choices related to those two steps affect the accuracy of surface elevation changes, and how well this accuracy is represented by formal uncertainties. In a simulation environment resembling CryoSat-2 measurements acquired over a region in northeast Greenland between December 2010 and January 2014, different local topography modeling approaches and different cell sizes for RAA, and four interpolation approaches are tested. Among the simulated cases, the choice of either favorable or unfavorable RAA affects the accuracy of results by about a factor of 6, and the different accuracy levels are propagated into the results of interpolation. For RAA, correcting local topography by an external digital elevation model (DEM) is best, if a very precise DEM is available, which is not always the case. Yet the best DEM-independent local topography correction (nine-parameter model within a 3,000 m diameter cell) is comparable to the use of a perfect DEM, which exactly represents the ice sheet topography, on the same cell size. Interpolation by heterogeneous measurement-error-filtered kriging is significantly more accurate (on the order of 50% error reduction) than interpolation methods, which do not account for heterogeneous errors.</jats:p> Article in Journal/Newspaper Greenland Ice Sheet PUBLISSO Fachrepositorium Lebenswissenschaften (ZB MED) Greenland Raa ENVELOPE(14.933,14.933,68.583,68.583) Mathematical Geosciences 52 4 499 525 |
institution |
Open Polar |
collection |
PUBLISSO Fachrepositorium Lebenswissenschaften (ZB MED) |
op_collection_id |
ftzbmed |
language |
English |
topic |
Ice sheet Satellite altimetry Article Interpolation Kriging Repeat altimetry |
spellingShingle |
Ice sheet Satellite altimetry Article Interpolation Kriging Repeat altimetry Strößenreuther, Undine Horwath, Martin Schröder, Ludwig How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry |
topic_facet |
Ice sheet Satellite altimetry Article Interpolation Kriging Repeat altimetry |
description |
<jats:title>Abstract</jats:title><jats:p>Satellite altimetry has been widely used to determine surface elevation changes in polar ice sheets. The original height measurements are irregularly distributed in space and time. Gridded surface elevation changes are commonly derived by repeat altimetry analysis (RAA) and subsequent spatial interpolation of height change estimates. This article assesses how methodological choices related to those two steps affect the accuracy of surface elevation changes, and how well this accuracy is represented by formal uncertainties. In a simulation environment resembling CryoSat-2 measurements acquired over a region in northeast Greenland between December 2010 and January 2014, different local topography modeling approaches and different cell sizes for RAA, and four interpolation approaches are tested. Among the simulated cases, the choice of either favorable or unfavorable RAA affects the accuracy of results by about a factor of 6, and the different accuracy levels are propagated into the results of interpolation. For RAA, correcting local topography by an external digital elevation model (DEM) is best, if a very precise DEM is available, which is not always the case. Yet the best DEM-independent local topography correction (nine-parameter model within a 3,000 m diameter cell) is comparable to the use of a perfect DEM, which exactly represents the ice sheet topography, on the same cell size. Interpolation by heterogeneous measurement-error-filtered kriging is significantly more accurate (on the order of 50% error reduction) than interpolation methods, which do not account for heterogeneous errors.</jats:p> |
format |
Article in Journal/Newspaper |
author |
Strößenreuther, Undine Horwath, Martin Schröder, Ludwig |
author_facet |
Strößenreuther, Undine Horwath, Martin Schröder, Ludwig |
author_sort |
Strößenreuther, Undine |
title |
How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry |
title_short |
How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry |
title_full |
How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry |
title_fullStr |
How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry |
title_full_unstemmed |
How Different Analysis and Interpolation Methods Affect the Accuracy of Ice Surface Elevation Changes Inferred from Satellite Altimetry |
title_sort |
how different analysis and interpolation methods affect the accuracy of ice surface elevation changes inferred from satellite altimetry |
publishDate |
2020 |
url |
https://repository.publisso.de/resource/frl:6468526 https://doi.org/10.1007/s11004-019-09851-3 |
long_lat |
ENVELOPE(14.933,14.933,68.583,68.583) |
geographic |
Greenland Raa |
geographic_facet |
Greenland Raa |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
http://lobid.org/resources/99370678379006441#!, 52(4):499-525 |
op_relation |
https://repository.publisso.de/resource/frl:6468526 https://doi.org/10.1007/s11004-019-09851-3 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1007/s11004-019-09851-3 |
container_title |
Mathematical Geosciences |
container_volume |
52 |
container_issue |
4 |
container_start_page |
499 |
op_container_end_page |
525 |
_version_ |
1787424939859509248 |