卫星遥感TM及SAR数据用于山区构造格局分析——以西藏墨脱地区为例

Application for Geology Structual Analysis with Landsat TM and Radarsat SAR Data in Motuo County

西藏墨脱地区山高路险 ,植被覆盖严重。区域地质调查中卫星遥感TM和SPOT光学图像受到植被干扰 ,地质构造露头不清 ;而微波侧视雷达图像 (SAR)由于受到高山地形影响 ,信号遮蔽 ,控制点的精确选取和遥感地质解译也十分困难。研究中采用DEM(数字高程模型 )模拟SAR图像的方法 ,利用模拟SAR图像对原始雷达图像进行控制点选取和影像正射校正 ,通过TM图像和SAR图像的正射影像处理以及二者的影像数据融合 ,并利用DEM进行三维构像 ,最大限度地发挥了TM图像和SAR图像的影像优势 ,用于测区区域地质和构造解译 ,取得了较好效果。

Motuo area in Tibet is a mountain area that is seriously covered by vegetation. The information comes from optical satellite sensors, such as TM and SPOT, are seriously disturbed by it. At the same time, the large deviation of terrain causes that the ground control points (GCP) can't be selected accurately. So, in this paper the author discusses how to ortho-rectify the SAR image in mountain area by DEM , and introduces the method of HIS transformation for image fusion of SAR and TM image which can get an enhanced image with high spatial resolution and good spectral resolution. The experiment shows that image qualities can be improved greatly and the application will make interpretation much easier, especially the structure interpretation.