Journal
REMOTE SENSING OF ENVIRONMENT
Volume 115, Issue 12, Pages 3457-3467Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2011.08.009
Keywords
Synthetic Aperture Radar; ENVISAT ASAR; Siberia; Freeze/thaw
Funding
- European Space Agency (ESA) [22185/09/I-OL]
- Improvement of Independent Research Environment for Young Researchers program
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Austrian Science Fund (FWF) [V150-N21]
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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. (C) 2011 Elsevier Inc. All rights reserved.
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