基于星载SAR数据的山区水体提取方法研究  

Study on the mountain water extraction method of the space-borne SAR Image

作　　者：孙亚勇[1,2] 李小涛[2] 杨锋杰[1] 黄诗峰[2] 

机构地区：[1]山东科技大学地质科学与信息工程学院,山东青岛266510 [2]中国水利水电科学研究院遥感技术应用中心,北京100048

出　　处：《中国水利水电科学研究院学报》2014年第3期258-263,共6页Journal of China Institute of Water Resources and Hydropower Research

基　　金：高分辨率对地观测系统重大专项(08-1/30B07-9001-13/15);水利部公益性行业科研专项(201001078)

摘　　要：具有全天候和全天时监测能力的星载SAR已经广泛应用于地表水体信息提取,但是因SAR的成像方式为斜距成像,在山区影像有显著的几何形变,将严重影响到影像的几何定位和水体信息的提取。本文以Envisat ASAR数据为例,探讨一种山区水体信息提取方法,即基于DEM的SAR图像模拟技术,对图像精确地正射校正和进一步的对运用双峰法提取的水体作山体阴影剔除。实验研究表明,此方法能很好的修正图像形变、减少山体阴影与水体混淆,提高了水体提取的精度。The space-borne SAR with all-weather and all-day monitoring ability has been widely used to extract the surface water information, but because of slant-range imaging, the SAR image has the significant geometric deformation in the mountain areas, which seriously affects the image geometric positioning accuracy and water body extraction. Therefore, the article takes the Envisat ASAR image as an example to discusses an extraction method of the mountain water, which is utilizing the SAR image simulation technology based on DEM to orthorectify images and to further eliminate the hillshade from the water which is extracted by the bimodal method. Finally, the experiment shows that this method perfectly orthorectified the deformation of the image, reduced the hillshade confused with water and improved the accuracy of the wa- ter extraction.

关 键 词：SAR DEM SAR模拟图 山体阴影 

分 类 号：P237[天文地球—摄影测量与遥感]