期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2010
卷号：XXXVIII - Part 8
页码：142-145
出版社：Copernicus Publications
摘要：Due to the high temporal sampling rate of ASAR Global Monitoring (GM) mode, it has a high application potential for analyzing freeze/thaw process in permafrost area. The aim of the study is to develop a robust and rigorous method for monitoring seasonal freeze/thaw cycles beyond the threshold approach. 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 experiment result for Siberian permafrost area illustrates that it can be a promising approach in monitoring permafrost ecosystems
关键词：Synthetic Aperture Radar; ASAR Global Monitoring; Permafrost; Freeze/thaw
