Technology Application |
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Water Area Extraction and Change Detection of the Poyang Lake Using SAR Data |
WANG Qing 1,2, LIAO Jing-juan 1 |
1. Center for Earth Observation and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract In order to extract the open water from the Poyang Lake by applying SAR data in different periods, the authors firstly analyzed the scattering mechanism of water,vegetation and sand,then used the texture of SAR imagery and polarized ratio and polarized difference to enhance the description of targets, and employed principal component transformation to enhance the contrast of water and other objects. With the first component,the area of open water on SAR imagery could be effectively and accurately extracted by setting up a proper threshold. The SAR images used were Envisat-ASAR and ALOS-PALSAR alternating polarization mode data. Meanwhile,after the analysis of two kinds of sample data with Jeffries-Matusita distance,ASAR data with C band could provide more accurate extraction of open water than those of PALSAR with L band. Finally,the open water of the Poyang Lake was extracted from SAR imagery in spring,summer and winter,and the changes of water area indicated the regular change of the open water of the Poyang Lake.
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Keywords
Remote sensing image
Rock information
The best density separation method
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Issue Date: 02 August 2011
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