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Validation of TanDEM-X Surface Elevation on Devon Island Ice Cap

Bernard-Grand'Maison, Claire and Burgess, David and Copeland, Luke and Abdullahi, Sahra and Wessel, Birgit and Rutishauser, Anja and Blankenship, D.D. and Young, Duncan (2019) Validation of TanDEM-X Surface Elevation on Devon Island Ice Cap. IUGG 2019, 2019-07-08 - 2019-07-18, Montreal, Canada.

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Remotely sensed surface elevation datasets are key to study mass balance and dynamic behaviours of glaciers, ice caps and ice sheets. Digital elevation models (DEM) generated from the TanDEM-X mission from single pass synthetic aperture radar interferometry (InSAR) at X-band provide an excellent potential resource for this purpose. However, they typically suffer from a negative bias in calculated surface elevations on glaciers due to penetration of radar waves in the snowpack and firn layers. Penetration depth depends on snowpack properties and acquisition parameters, and can be estimated using a simple model based on backscatter intensity, interferometric coherence and height of ambiguity parameters. To validate modelled penetration depths, multiple concurrent acquisitions of TanDEM-X images with ground measurements, airborne campaigns and spaceborne derived surface elevations were completed over Devon Island Ice Cap (75.25° N, 82.5° W) in the Canadian Arctic. Comparison of three TanDEM-X mosaic DEMs (winter 2010/11, 2013/14 and spring 2018) with differential GPS measurements (2011 and 2018), laser altimetry surveys (NASA ATM 2011 and SEARCH data 2018), and the Arctic DEM (2014), reveal an elevation bias of approximatively -3 m wherever firn layers are present below the snowpack. In this talk, we present corrected surface elevations for Devon Island Ice Cap and assess the spatial variability of penetration depths in relation to surface conditions and measured radar parameters. This validation case study improves the modelling of penetration depth for future application in all TanDEM-X DEMs over glaciated terrain.

Item URL in elib:https://elib.dlr.de/129957/
Document Type:Conference or Workshop Item (Poster)
Title:Validation of TanDEM-X Surface Elevation on Devon Island Ice Cap
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bernard-Grand'Maison, ClaireUniversity of OttawaUNSPECIFIEDUNSPECIFIED
Copeland, LukeUniversity of OttawaUNSPECIFIEDUNSPECIFIED
Abdullahi, SahraUNSPECIFIEDhttps://orcid.org/0009-0000-4328-2843UNSPECIFIED
Wessel, BirgitUNSPECIFIEDhttps://orcid.org/0000-0002-8673-2485UNSPECIFIED
Rutishauser, AnjaUniversity of AlbertaUNSPECIFIEDUNSPECIFIED
Blankenship, D.D.Institute for Geophysics, University of Texas at Austin, Austin, TX, USAUNSPECIFIEDUNSPECIFIED
Young, DuncanInstitute for Geophysics, University of Texas at Austin, Austin, TX, USAUNSPECIFIEDUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:TanDEM-X, InSAR, penetration bias, Devon Ice Cap, Elevation change
Event Title:IUGG 2019
Event Location:Montreal, Canada
Event Type:international Conference
Event Start Date:8 July 2019
Event End Date:18 July 2019
Organizer:Intern. Union of Geodesy and Geophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - TSX/TDX Payload Ground Segment
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface Dynamics
Deposited By: Wessel, Dr.-Ing. Birgit
Deposited On:05 Nov 2019 12:04
Last Modified:24 Apr 2024 20:33

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