利用雷达干涉数据进行城市不透水层百分比估算  

Estimating Urban Impervious Surface Percentage with ERS-1/2 InSAR Data

作　　者：江利明[1,2] 廖明生[1] 林珲[2] 杨立民[2] 汪长城[1] 

机构地区：[1]武汉大学,测绘遥感信息工程国家重点实验室,湖北武汉430079 [2]香港中文大学,太空与地球信息科学研究所

出　　处：《遥感学报》2008年第1期176-185,共10页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家自然科学基金(编号:60472039);863课题(编号:209170325).

摘　　要：人工不透水层是城市地区的重要特征。作为城市生态环境的关键指数,不透水层百分比(Impervious Surfaces Percentage,ISP)常用于城市水文过程模拟、水质面源污染及城市专题制图等研究中。本文利用ERS-1/2重复轨道雷达干涉数据,采用分类与回归树(CART)算法探究了雷达遥感在城市ISP估算中的可行性和潜力,并与SPOT5 HRG光学遥感图像的估算结果进行了分析比较。香港九龙港岛实验区的初步研究结果表明,雷达干涉数据在城市不透水层研究中具有一定的应用潜力,特别是裸土和稀疏植被的ISP估算结果要好于光学遥感,这主要得益于雷达干涉数据(特别是长时间相干图像)在人工建筑物和裸土或稀疏植被之间具有很强的区分能力,另外,雷达干涉数据和光学遥感数据间的融合能够提高ISP估算精度。Impervious surfaces are usually defined as anthropogenic features through which water cannot infiltrate the soil,typically including buildings,roads,parking lots,sidewalks,and other built surfaces.Due to the close correlation with the spatial extent and intensity of urban development,impervious surface has been recently recognized as a key environmental indicator in assessing urban ecological condition and utilized to investigate urban hydrology,urban climate,land use planning and resource management.Over the past decades,extensive researches have been carried out to map impervious surfaces cost-effectively with satellite remote sensing data,especially multi-spectral optical images(e.g.Landsat TM/ETM+ and SPOT imagery).However,an accurate representation of impervious surface is still a challenge using these middle-resolution optical remote sensing data,because of the complexity of urban/suburban landscapes and the spectral confusions among different land-use/cover types(such as between barren land and parking lots).The spectral confusion as well as the presence of mixed pixel may result in an overestimation of impervious surface distribution in the less-developed areas,but underestimation in the well-developed areas.Unlike optical images that represent the spectral reflectivity of the targets illuminated by sun light,synthetic aperture radar(SAR) images are very sensitive to the surface roughness,shape,structure,dielectric properties of the illuminated ground objects and can provide information complementary to optical data.And recent advantages have shown that the use of SAR interferometric coherence products(e.g.coherence,ratio intensity and average intensity) can improve the capability to distinguish natural land covers and built-up objects in urban area.These SAR feature images generally are derived from SAR interferometry(InSAR) pairs acquired with relatively small perpendicular baseline and long interval.The main aim of this paper is to explore potentials of the use of InSAR data in mapping impervious surfa

关 键 词：城市不透水层 雷达遥感 ERS-1/2重复轨道干涉测量 分类与回归树 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]