基于SAR数据的鄱阳湖水体提取及变化监测研究  

Water Area Extraction and Change Detection of the Poyang Lake Using SAR Data

作　　者：王庆[1,2] 廖静娟[1] 

机构地区：[1]中国科学院对地观测与数字地球科学中心,北京100101 [2]中国科学院研究生院,北京100049

出　　处：《国土资源遥感》2010年第4期91-97,共7页Remote Sensing for Land & Resources

基　　金：863计划项目(编号:2009AA12Z102);973计划项目(编号:2009CB723906)共同资助

摘　　要：以C波段Envisat ASAR和L波段ALOS PALSAR交替极化模式的数据为数据源,分析了鄱阳湖主要地物的散射特性,并分别引入纹理特征和不同极化通道间的极化差和极化比等参数增强地物的表征;应用主成分变换对地物的参数向量进行特征提取,增强水体与其他地物的差异,并在第一主成分中选择适当阈值,准确提取出不同时期的鄱阳湖水体信息。实验表明,用上述方法提取水体信息的精度比直接使用地物后向散射系数的监督分类法提取精度要高得多。通过分析和对比上述不同波段SAR数据中水体与其他类别间的Jeffries-Matusita距离可以看出,C波段SAR数据提取鄱阳湖水体的精度比L波段高。并给出了鄱阳湖水体在2007年春、夏和冬3个季节中水域面积的动态变化情况。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.

关 键 词：纹理 主成分变换 水体提取 ASAR PALSAR 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]