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Monitoring glaciers and indications of subglacial volcanic activity using small-scale Top-Hat reflectors - An IsViews experiment on Myrdalsjökull, Iceland

Minet, Christian and Duque Biarge, Sergi and Jaenicke, Julia and Münzer, Ulrich and Mayer, Christoph and Franke, Jonas and Gudmundsson, Agust and Parizzi, Alessandro and Fritz, Thomas and Eineder, Michael (2014) Monitoring glaciers and indications of subglacial volcanic activity using small-scale Top-Hat reflectors - An IsViews experiment on Myrdalsjökull, Iceland. In: Geophysical Research Abstracts 2014 (EGU2014), 16. Copernicus. EGU General Assembly 2014, 28. April - 02. Mai 2014, Wien, Österreich.

[img] PDF (Folien der Präsentation) - Only accessible within DLR

Official URL: http://meetingorganizer.copernicus.org/EGU2014/EGU2014-4945-5.pdf


Subglacial volcanic eruptions often provide indications of activity some time before the actual catastrophic event. Surface undulations appear on top of the ice cap and meltwater torrents can occur at the glacier margin. Even large scale uplifts of ice caps have been observed.Within the project IsViews a processing chain, based on high spatially and temporally resolved remote sensing imagery, will be developed in order to automatically identify such early indications. The main data used for this analysis are acquired by the TerraSAR-X, TanDEM-X and RapidEye satellites. First investigations concerning the feasibility of the near real-time warning system and the general baseline conditions are carried out on two large plateau glaciers in southern Iceland, namely Mýrdalsjökull and Vatnajökull. Within the 2013 IsViews field work an experiment was started in order to test a new way of glacier monitoring. Two test sites were established on the Mýrdalsjökull ice cap (one at the equilibrium line and one below), each consisting of a permanent GPS station and two nearby RADAR reflectors. These RADAR reflectors are specially designed Top-Hat reflectors, which are cheap to manufacture, small (50 cm diameter) and lightweight and therefore easy to handle, transport and deploy. Their special design makes them visible in SAR images independent of orientation, so different acquisition geometries and even different sensors can be used. The drawback of the small, low reflecting Top-Hat can be overcome by using the newly implemented Staring Spotlight Mode of the German SAR Satellite TerraSAR-X, providing an unprecedented resolution of down to 20 cm in the azimuth direction. The reflectors, as point targets, allow absolute positioning within the cm-level in the TerraSAR-X data. Time series of SAR data can be used to derive position and altitude changes of the reflector itself and possibly even melting rates by exploiting the different signal paths. The visibility of the Top-Hat reflectors has been confirmed in various test acquisitions shortly after their deployment, and initial position measurements have been carried out. Further acquisitions will be recorded once the reflectors emerge from the winter snow cover, and correlation of the measurements will be performed once the data of the GPS stations are received in March 2014. The ease of deploying these new reflectors combined with the high-resolution capabilities of the TerraSAR-X satellite provides new monitoring possibilities, not only for glacial flow dynamics but also for rock movements and deformation of infrastructure.

Item URL in elib:https://elib.dlr.de/93215/
Document Type:Conference or Workshop Item (Speech)
Title:Monitoring glaciers and indications of subglacial volcanic activity using small-scale Top-Hat reflectors - An IsViews experiment on Myrdalsjökull, Iceland
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Minet, Christianchristian.minet (at) dlr.deUNSPECIFIED
Duque Biarge, SergiSergi.DuqueBiarge (at) dlr.deUNSPECIFIED
Jaenicke, JuliaLMU MünchenUNSPECIFIED
Münzer, UlrichLMU MünchenUNSPECIFIED
Mayer, ChristophBay. Akademie der WissenschaftenUNSPECIFIED
Franke, JonasSensing Solutions GmbH; Wörthstr. 42; 85570 MünchenUNSPECIFIED
Gudmundsson, AgustFjarkönnun ehf.UNSPECIFIED
Parizzi, Alessandroalessandro.parizzi (at) dlr.deUNSPECIFIED
Fritz, Thomasthomas.fritz (at) dlr.deUNSPECIFIED
Eineder, Michaelmichael.eineder (at) dlr.deUNSPECIFIED
Date:May 2014
Journal or Publication Title:Geophysical Research Abstracts 2014 (EGU2014)
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Series Name:Geophysical Research Abstracts
Keywords:Icelang, glacier, TerraSAR-X, TanDEM-X, Staring Spotlight
Event Title:EGU General Assembly 2014
Event Location:Wien, Österreich
Event Type:international Conference
Event Dates:28. April - 02. Mai 2014
Organizer:European Geosciences Union
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 - Vorhaben hochauflösende Fernerkundungsverfahren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Minet, Christian
Deposited On:08 Dec 2014 09:39
Last Modified:09 Dec 2014 09:28

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