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Monitoring rapid permafrost thaw using elevation models generated from satellite radar interferometry

Bernhard, Philipp and Zwieback, Simon and Leinss, Silvan and Hajnsek, Irena (2020) Monitoring rapid permafrost thaw using elevation models generated from satellite radar interferometry. In: EGUsphere, 7348. Copernicus GmbH. EGU General Assembly 2020, 2020-05-04 - 2020-05-08, Vienna, Austria. doi: 10.3929/ethz-b-000453641.

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Official URL: https://www.research-collection.ethz.ch/handle/20.500.11850/453641

Abstract

Vast areas of the Arctic host ice-rich permafrost, which is becoming increasingly vulnerable to terrain-altering thermokarst in a warming climate. Among the most rapid and dramatic changes are retrogressive thaw slumps. These slumps evolve by a retreat of the slump headwall during the summer months, making them detectable by comparing digital elevation models over time using the volumetric change as an indicator. Despite the availability of many topographic InSAR observations to generate digital elevation models, there is currently no method to map and analyze retrogressive thaw slumps. Here, we present and assess a method to detect and monitor thaw slumps using time-series of elevation models (DEMs), generated from single-pass InSAR observations, which have been acquired across the Arctic at high resolution since 2011 by the TanDEM-X satellite pair. At least three observations over this timespan are available with a spatial resolution of about 12 meter and the height sensitivity of 0.5-2 meter. We first difference the generated digital elevation and detect significant elevation changes taking the uncertainty estimates of each elevation measurement into account. In the implementation of the processing chain we focused on making it as automated as much as possible to be able to cover large areas of the northern hemisphere. This includes detecting common problems with the data and apply appropriate algorithms to obtain DEMs with high accuracy. Additionally we implemented methods to deal with problematic features like wet-snow, vegetation and water bodies. After generating the DEMs we us DEM differencing followed by a blob detection and cluster algorithm to detect active thaw slumps. To improve the accuracy of our method we apply and compare different machine learning methods, namely a simple threshold method, a Random Forest and a Support-Vector-Machine. To estimate the accuracy of our method we use data from past studies as well as a classification based on optical satellite data. The obtained locations of thaw slumps can be used as a starting point to extract important slump properties, like the headwall height and volumetric change, which are currently not available on regional scales. Additionally to the thaw slump detection, we show first results of the thaw slump property extraction for thaw slumps located in Northern Canada (Peel Plateau, Mackenzie River Delta, Banks Island, Ellesmere Island).

Item URL in elib:https://elib.dlr.de/141229/
Document Type:Conference or Workshop Item (Speech)
Title:Monitoring rapid permafrost thaw using elevation models generated from satellite radar interferometry
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bernhard, PhilippETH ZürichUNSPECIFIED
Zwieback, SimonETH ZürichUNSPECIFIED
Leinss, SilvanETH ZürichUNSPECIFIED
Hajnsek, IrenaDLR-HR, ETH ZurichUNSPECIFIED
Date:3 December 2020
Journal or Publication Title:EGUsphere
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:7348
DOI :10.3929/ethz-b-000453641
Publisher:Copernicus GmbH
Series Name:EGUsphere
Status:Published
Keywords:permafrost, elevation model, satellite radar interferometry, InSAR
Event Title:EGU General Assembly 2020
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:2020-05-04 - 2020-05-08
Organizer:EGU
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 - Security-relevant Earth Observation
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Radzuweit, Sibylle
Deposited On:05 Mar 2021 10:13
Last Modified:05 Mar 2021 10:13

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