1. Monitoring freeze/thaw cycles using ENVISAT ASAR Global Mode
- Author
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Park, Sang-Eun, Bartsch, Annett, Sabel, Daniel, Wagner, Wolfgang, Naeimi, Vahid, and Yamaguchi, Yoshio
- Subjects
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ENVIRONMENTAL monitoring , *RADIOMETERS , *BACKSCATTERING , *TIME series analysis , *BIOTIC communities , *PERMAFROST - Abstract
Abstract: 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 permafrost ecosystems. [Copyright &y& Elsevier]
- Published
- 2011
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