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Assessment of Penetration Depth Bias in TanDEM-X Surface Elevation on Devon Island Ice Cap, Canadian Arctic

Bernard-Grand'Maison, Claire and Burgess, David and Copeland, Luke and Abdullahi, Sahra and Wessel, Birgit and Roth, Achim (2019) Assessment of Penetration Depth Bias in TanDEM-X Surface Elevation on Devon Island Ice Cap, Canadian Arctic. TerraSAR-X / TanDEM-X Science Team Meeting 2019, 21.-24. Okt. 2019, DLR Oberpfaffenhofen, Germany.

Full text not available from this repository.

Abstract

Remotely sensed surface elevation datasets are key to study mass balance and dynamic behaviours of glaciers, ice caps, and ice sheets. Digital elevation models (DEMs) 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 glaciated terrain 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 from backscatter intensity, interferometric coherence and height of ambiguity of input scenes. To validate modelled penetration depth, we take advantage of the overlap of multiple TanDEM-X scenes with surface elevation data derived from ground, airborne and spaceborne campaigns over Devon Island Ice Cap (75.25° N, 82.5° W) in the Canadian Arctic. Comparison of raw TanDEM-X DEMs from Fall and Winter 2010 to 2014 and 2018 with kinematic surface differential GPS transects, ATM/IceBridge NASA laser altimetry surveys and ArcticDEM Strip DEMs, reveal significant elevation bias of approximatively -3 m wherever firn layers are present below the snowpack. We present the interannual and spatial variability of penetration depths in relation to the near-surface conditions and radar cquisition parameters over Devon Ice Cap. This validation case study aims at improving models of penetration depth for future applications of TanDEM-X DEMs over glaciated terrain.

Item URL in elib:https://elib.dlr.de/129954/
Document Type:Conference or Workshop Item (Speech)
Title:Assessment of Penetration Depth Bias in TanDEM-X Surface Elevation on Devon Island Ice Cap, Canadian Arctic
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bernard-Grand'Maison, ClaireUniversity of OttawaUNSPECIFIED
Burgess, DavidNRCUNSPECIFIED
Copeland, LukeUniversity of OttawaUNSPECIFIED
Abdullahi, SahraSahra.Abdullahi (at) dlr.deUNSPECIFIED
Wessel, BirgitBirgit.Wessel (at) dlr.dehttps://orcid.org/0000-0002-8673-2485
Roth, AchimAchim.Roth (at) dlr.deUNSPECIFIED
Date:2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:TanDEM-X, InSAR, penetration bias, ice
Event Title:TerraSAR-X / TanDEM-X Science Team Meeting 2019
Event Location:DLR Oberpfaffenhofen, Germany
Event Type:international Conference
Event Dates:21.-24. Okt. 2019
Organizer:DLR Oberpfaffenhofen
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - TSX/TDS 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 12:03
Last Modified:05 Nov 2019 12:03

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