Monitoring freeze/thaw cycles using ENVISAT ASAR Global Mode

Due to the high temporal sampling rate of ASAR Global Monitoring (GM) mode, it has a high application potential for analyzing the land surface freeze/thaw process in high latitudes. This study aims to develop effective methods of extracting freeze/thaw transition dates of permafrost areas from ASAR...

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Bibliographic Details
Published in:Remote Sensing of Environment
Main Authors: Park, Sang-Eun, Bartsch, Annett, Sabel, Daniel, Wagner, Wolfgang, Naeimi, Vahid, Yamaguchi, Yoshio
Format: Article in Journal/Newspaper
Language:unknown
Published: Elsevier 2011
Subjects:
Landoberfläche
Asar
permafrost
Online Access:https://elib.dlr.de/77938/
http://www.sciencedirect.com/science/article/pii/S0034425711002914
Description
Summary:Due to the high temporal sampling rate of ASAR Global Monitoring (GM) mode, it has a high application potential for analyzing the land surface freeze/thaw process in high latitudes. This study aims to develop effective methods of extracting freeze/thaw transition dates of permafrost areas from ASAR GM data sets. In order to use ASAR GM time-series for analyzing freeze/thaw states, a least square fitting of piecewise step function is introduced. The thawing date can be determined by minimizing the sum of squared residuals between measured backscattering time-series and a pre-defined step function. An experimental result for a Siberian permafrost region illustrates that it can be a promising approach in monitoring permafrostecosystems.

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