摘要
基于雷达干涉相干原理,利用6景时间跨度为4年的ENVISATASAR雷达影像,分析了不同空间尺度(分辨率分别为20m和80m)的苏中沿海地区典型地物的相干特征。研究结果表明:①低分辨率图像的地物相干性总体上要低于高分辨率图像,但前者的相干系数对比度要优于后者;②对于面积较小的地物,空间尺度的变化对相干性的影响显著,而对于面积较大的地物,则影响较小。该研究成果可用于提高土地利用类型分类的精度以及有效地提取长时间地表形变反演中所需的高相干点信息。
Based on the theory of interferometric synthetic aperture radar （INSAR）, 6 ENVISAR ASAR radar images from 2003 to 2007 are used to generate the coherence maps of coastal area in the middle Jiangsu Province,on different spatial scales with a resolution of 20m and 80m,respectively. The coherence features of typical urban and rural objects in the study area are analyzed. Result shows that ①the average coherence at low resolution is lower than that at high resolution, however, the former coherence contrast is higher than latter;② the effect of spatial scale on coherence in obvious for small objects, but for objects with a large area, it is less obvious. This research result can be used to improve the accuracy of land use classification and also can help selecting the high coherent points （HCPs） which are necessary in the retrieval of ground deformation.
出处
《遥感技术与应用》
CSCD
北大核心
2009年第1期109-113,共5页
Remote Sensing Technology and Application
基金
国家自然科学基金项目(40504044)
国家自然科学基金项目(40601058)
