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High-resolution topography of the Antarctic Peninsula combining the TanDEM-X DEM and Reference Elevation Model of Antarctica (REMA) mosaic

Dong, Yuting und Zhao, Ji und Floricioiu, Dana und Krieger, Lukas und Fritz, Thomas und Eineder, Michael (2021) High-resolution topography of the Antarctic Peninsula combining the TanDEM-X DEM and Reference Elevation Model of Antarctica (REMA) mosaic. The Cryosphere, 15, Seiten 4421-4443. Copernicus Publications. doi: 10.5194/tc-15-4421-2021. ISSN 1994-0416.

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Offizielle URL: https://tc.copernicus.org/articles/15/4421/2021/tc-15-4421-2021.html

Kurzfassung

The Antarctic Peninsula (AP) is one of the widely studied polar regions because of its sensitivity to climate change and potential contribution of its glaciers to global sea level rise. Precise digital elevation models (DEMs) at a high spatial resolution are much demanded for investigating the complex glacier system of the AP at fine scales. However, the two most recent circum-Antarctic DEMs, the 12 m TanDEM-X DEM (TDM DEM) from bistatic interferometric synthetic aperture radar (InSAR) data acquired between 2013 and 2014 and the Reference Elevation Model of Antarctica mosaic (REMA mosaic) at an 8 m spatial resolution derived from optical data acquired between 2011 and 2017 have specific individual limitations in this area. The TDM DEM has the advantage of good data consistency and few data voids (approx. 0.85 %), but there exist residual systematic elevation errors such as phase-unwrapping errors in the non-edited DEM version. The REMA mosaic has high absolute vertical accuracy, but on the AP it suffers from extended areas with data voids (approx. 8 %). To generate a consistent, gapless and high-resolution topography product of the AP, we fill the data voids in the TDM DEM with newly processed TDM raw DEM data acquired in austral winters of 2013 and 2014 and detect and correct the residual systematic elevation errors (i.e. elevation biases) in the TDM DEM with the support of the accurately calibrated REMA mosaic. Instead of a pixelwise replacement with REMA mosaic elevations, these provide reference values to correct the TDM elevation biases over entire regions detected through a path propagation algorithm. The procedure is applied iteratively to gradually correct the errors in the TDM DEM from a large to small scale. The proposed method maintains the characteristics of an InSAR-generated DEM and is minimally influenced by temporal or penetration differences between the TDM DEM and REMA mosaic. The performance of the correction is evaluated with laser altimetry data from Operation IceBridge and ICESat-2 missions. The overall root mean square error (RMSE) of the corrected TDM DEM has been reduced from more than 30 m to about 10 m which together with the improved absolute elevation accuracy indicates comparable values to the REMA mosaic. The generated high-resolution DEM depicts the up-to-date topography of the AP in detail and can be widely used for interferometric applications as well as for glaciological studies on individual glaciers or at regional scales.

elib-URL des Eintrags:https://elib.dlr.de/144691/
Dokumentart:Zeitschriftenbeitrag
Titel:High-resolution topography of the Antarctic Peninsula combining the TanDEM-X DEM and Reference Elevation Model of Antarctica (REMA) mosaic
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Dong, Yutingdongyt (at) cug.edu.cnNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Zhao, Jizhaoji (at) cug.edu.cnNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Floricioiu, DanaDana.Floricioiu (at) dlr.dehttps://orcid.org/0000-0002-1647-7191NICHT SPEZIFIZIERT
Krieger, Lukaslukas.krieger (at) dlr.dehttps://orcid.org/0000-0002-2464-3102133712118
Fritz, ThomasThomas.Fritz (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Eineder, MichaelMichael.Eineder (at) dlr.dehttps://orcid.org/0000-0001-5068-1324NICHT SPEZIFIZIERT
Datum:13 September 2021
Erschienen in:The Cryosphere
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:15
DOI:10.5194/tc-15-4421-2021
Seitenbereich:Seiten 4421-4443
Verlag:Copernicus Publications
ISSN:1994-0416
Status:veröffentlicht
Stichwörter:TanDEM-X DEM, REMA mosaic, Antarctic Peninsula, high-resolution, topography
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - SAR-Methoden
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > SAR-Signalverarbeitung
Hinterlegt von: Floricioiu, Dr. Dana
Hinterlegt am:20 Okt 2021 14:09
Letzte Änderung:25 Apr 2023 08:45

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