Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data
Observations of glacier mass changes are key to understanding the response of glaciers to climate change and related impacts, such as regional runoff, ecosystem changes, and global sea-level rise. Spaceborne optical and radar sensors make it possible to quantify glacier elevation changes, and thus m...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2024
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Online Access: | https://elib.dlr.de/199477/ https://elib.dlr.de/199477/1/egusphere-2023-2309.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2309/ |
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ftdlr:oai:elib.dlr.de:199477 |
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openpolar |
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Open Polar |
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German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
English |
topic |
SAR-Signalverarbeitung |
spellingShingle |
SAR-Signalverarbeitung Piermattei, Livia Zemp, Michael Sommer, Christian Brun, Fanny Braun, Matthias Andreassen, Liss M. Belart, Joaquín M. C. Berthier, Etienne Bhattacharya, Atanu Boehm Vock, Laura Bolch, Tobias Dehecq, Amaury Dussaillant, Ines Falaschi, Daniel Florentine, Caitlyn Floricioiu, Dana Ginzler, Christian Guillet, Gregoire Hugonnet, Romain Huss, Matthias Kääb, Andreas King, Owen Klug, Christoph Knuth, Friedrich Krieger, Lukas La Frenierre, Jeff McNabb, Robert McNeil, Christopher Prinz, Rainer Sass, Louis Seehaus, Thorsten Shean, David Treichler, Désirée Wendt, Anja Yang, Ruitang Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data |
topic_facet |
SAR-Signalverarbeitung |
description |
Observations of glacier mass changes are key to understanding the response of glaciers to climate change and related impacts, such as regional runoff, ecosystem changes, and global sea-level rise. Spaceborne optical and radar sensors make it possible to quantify glacier elevation changes, and thus multi-annual mass changes, on a regional and global scale. However, estimates from a growing number of studies show a wide range of results with differences often beyond uncertainty bounds. Here, we present the outcome of a community-based inter-comparison experiment using spaceborne optical stereo (ASTER) and synthetic aperture radar interferometry (TanDEM-X) data to estimate elevation changes for defined glaciers and target periods that pose different assessment challenges. Using provided or self-processed digital elevation models (DEMs) for five test sites, 12 research groups provided a total of 97 spaceborne elevation-change datasets using various processing strategies. Validation with airborne data showed that using an ensemble estimate is promising to reduce random errors from different instruments and processing methods, but still requires a more comprehensive investigation and correction of systematic errors. We found that scene selection, DEM processing, and co-registration have the biggest impact on the results. Other processing steps, such as treating spatial data voids, differences in survey periods, or radar penetration, can still be important for individual cases. Future research should focus on testing different implementations of individual processing steps (e.g. co-registration) and addressing issues related to temporal corrections, radar penetration, glacier area changes, and density conversion. Finally, there is a clear need for our community to develop best practices, use open, reproducible software, and assess overall uncertainty in order to enhance inter-comparison and empower physical process insights across glacier elevation-change studies. |
format |
Article in Journal/Newspaper |
author |
Piermattei, Livia Zemp, Michael Sommer, Christian Brun, Fanny Braun, Matthias Andreassen, Liss M. Belart, Joaquín M. C. Berthier, Etienne Bhattacharya, Atanu Boehm Vock, Laura Bolch, Tobias Dehecq, Amaury Dussaillant, Ines Falaschi, Daniel Florentine, Caitlyn Floricioiu, Dana Ginzler, Christian Guillet, Gregoire Hugonnet, Romain Huss, Matthias Kääb, Andreas King, Owen Klug, Christoph Knuth, Friedrich Krieger, Lukas La Frenierre, Jeff McNabb, Robert McNeil, Christopher Prinz, Rainer Sass, Louis Seehaus, Thorsten Shean, David Treichler, Désirée Wendt, Anja Yang, Ruitang |
author_facet |
Piermattei, Livia Zemp, Michael Sommer, Christian Brun, Fanny Braun, Matthias Andreassen, Liss M. Belart, Joaquín M. C. Berthier, Etienne Bhattacharya, Atanu Boehm Vock, Laura Bolch, Tobias Dehecq, Amaury Dussaillant, Ines Falaschi, Daniel Florentine, Caitlyn Floricioiu, Dana Ginzler, Christian Guillet, Gregoire Hugonnet, Romain Huss, Matthias Kääb, Andreas King, Owen Klug, Christoph Knuth, Friedrich Krieger, Lukas La Frenierre, Jeff McNabb, Robert McNeil, Christopher Prinz, Rainer Sass, Louis Seehaus, Thorsten Shean, David Treichler, Désirée Wendt, Anja Yang, Ruitang |
author_sort |
Piermattei, Livia |
title |
Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data |
title_short |
Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data |
title_full |
Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data |
title_fullStr |
Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data |
title_full_unstemmed |
Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data |
title_sort |
observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using aster and tandem-x data |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://elib.dlr.de/199477/ https://elib.dlr.de/199477/1/egusphere-2023-2309.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2309/ |
genre |
The Cryosphere The Cryosphere Discussions |
genre_facet |
The Cryosphere The Cryosphere Discussions |
op_relation |
https://elib.dlr.de/199477/1/egusphere-2023-2309.pdf Piermattei, Livia und Zemp, Michael und Sommer, Christian und Brun, Fanny und Braun, Matthias und Andreassen, Liss M. und Belart, Joaquín M. C. und Berthier, Etienne und Bhattacharya, Atanu und Boehm Vock, Laura und Bolch, Tobias und Dehecq, Amaury und Dussaillant, Ines und Falaschi, Daniel und Florentine, Caitlyn und Floricioiu, Dana und Ginzler, Christian und Guillet, Gregoire und Hugonnet, Romain und Huss, Matthias und Kääb, Andreas und King, Owen und Klug, Christoph und Knuth, Friedrich und Krieger, Lukas und La Frenierre, Jeff und McNabb, Robert und McNeil, Christopher und Prinz, Rainer und Sass, Louis und Seehaus, Thorsten und Shean, David und Treichler, Désirée und Wendt, Anja und Yang, Ruitang (2024) Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data. The Cryosphere Discussions. Copernicus Publications. doi:10.5194/egusphere-2023-2309 <https://doi.org/10.5194/egusphere-2023-2309>. ISSN 1994-0432. (eingereichter Beitrag) |
op_rights |
cc_by |
op_doi |
https://doi.org/10.5194/egusphere-2023-2309 |
_version_ |
1790608872421982208 |
spelling |
ftdlr:oai:elib.dlr.de:199477 2024-02-11T10:09:08+01:00 Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data Piermattei, Livia Zemp, Michael Sommer, Christian Brun, Fanny Braun, Matthias Andreassen, Liss M. Belart, Joaquín M. C. Berthier, Etienne Bhattacharya, Atanu Boehm Vock, Laura Bolch, Tobias Dehecq, Amaury Dussaillant, Ines Falaschi, Daniel Florentine, Caitlyn Floricioiu, Dana Ginzler, Christian Guillet, Gregoire Hugonnet, Romain Huss, Matthias Kääb, Andreas King, Owen Klug, Christoph Knuth, Friedrich Krieger, Lukas La Frenierre, Jeff McNabb, Robert McNeil, Christopher Prinz, Rainer Sass, Louis Seehaus, Thorsten Shean, David Treichler, Désirée Wendt, Anja Yang, Ruitang 2024 application/pdf https://elib.dlr.de/199477/ https://elib.dlr.de/199477/1/egusphere-2023-2309.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2309/ en eng Copernicus Publications https://elib.dlr.de/199477/1/egusphere-2023-2309.pdf Piermattei, Livia und Zemp, Michael und Sommer, Christian und Brun, Fanny und Braun, Matthias und Andreassen, Liss M. und Belart, Joaquín M. C. und Berthier, Etienne und Bhattacharya, Atanu und Boehm Vock, Laura und Bolch, Tobias und Dehecq, Amaury und Dussaillant, Ines und Falaschi, Daniel und Florentine, Caitlyn und Floricioiu, Dana und Ginzler, Christian und Guillet, Gregoire und Hugonnet, Romain und Huss, Matthias und Kääb, Andreas und King, Owen und Klug, Christoph und Knuth, Friedrich und Krieger, Lukas und La Frenierre, Jeff und McNabb, Robert und McNeil, Christopher und Prinz, Rainer und Sass, Louis und Seehaus, Thorsten und Shean, David und Treichler, Désirée und Wendt, Anja und Yang, Ruitang (2024) Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data. The Cryosphere Discussions. Copernicus Publications. doi:10.5194/egusphere-2023-2309 <https://doi.org/10.5194/egusphere-2023-2309>. ISSN 1994-0432. (eingereichter Beitrag) cc_by SAR-Signalverarbeitung Zeitschriftenbeitrag PeerReviewed 2024 ftdlr https://doi.org/10.5194/egusphere-2023-2309 2024-01-22T00:23:59Z Observations of glacier mass changes are key to understanding the response of glaciers to climate change and related impacts, such as regional runoff, ecosystem changes, and global sea-level rise. Spaceborne optical and radar sensors make it possible to quantify glacier elevation changes, and thus multi-annual mass changes, on a regional and global scale. However, estimates from a growing number of studies show a wide range of results with differences often beyond uncertainty bounds. Here, we present the outcome of a community-based inter-comparison experiment using spaceborne optical stereo (ASTER) and synthetic aperture radar interferometry (TanDEM-X) data to estimate elevation changes for defined glaciers and target periods that pose different assessment challenges. Using provided or self-processed digital elevation models (DEMs) for five test sites, 12 research groups provided a total of 97 spaceborne elevation-change datasets using various processing strategies. Validation with airborne data showed that using an ensemble estimate is promising to reduce random errors from different instruments and processing methods, but still requires a more comprehensive investigation and correction of systematic errors. We found that scene selection, DEM processing, and co-registration have the biggest impact on the results. Other processing steps, such as treating spatial data voids, differences in survey periods, or radar penetration, can still be important for individual cases. Future research should focus on testing different implementations of individual processing steps (e.g. co-registration) and addressing issues related to temporal corrections, radar penetration, glacier area changes, and density conversion. Finally, there is a clear need for our community to develop best practices, use open, reproducible software, and assess overall uncertainty in order to enhance inter-comparison and empower physical process insights across glacier elevation-change studies. Article in Journal/Newspaper The Cryosphere The Cryosphere Discussions German Aerospace Center: elib - DLR electronic library |