Application Of Remote Sensing In The Survey Of Landslides In Fengjie County, Three Gorge Reservoir Area

The research area, Fengjie County, is located in the center of Three Gorge Reservoir Area and is a place with landslides frequently occurring in history, so it is of great practical meaning to investigate and study the forming and distribution regularities of landslides there. Investigation using Remote Sensing (RS) technology can breakthrough the limits of traditional methods, make full use of its capability of integration, visualization, rapidity and vast-dimensions analysis, and get better resultsThe paper takes the up-to-date Landsat-7 ETM+ data, which is the most widely used, and Quickbird data, which has the highest resolution nowadays, and according the features of the data and landslides, processes the Quickbird data with 1:10 000 DEM orthophoto correction and the landsat-7 ETM+ data as follows:(1) selecting optimal spectrum band: selects 753 bands as the optimal bands;(2)image intensifying: selects the principle components processing method on the basis of comparing several image intensifying methods;(3)rigour geometric Direction: corrects the geometric distortion of the map;(4)image fusion: mainly takes HIS space transform fusion and resolution fusion method, and acquires maps with higher spectrum resolution as well as space resolution.After that, the visual effect of the image has been enhanced, and the interpretation precision. At last, the paper interprets the geological background of the forming of landslides, and reveals the landform, stratum, lithology and geologic structure based on the ETM+ image. And also, the paper interprets the location and distribution of the specific disaster bodies based On the Quickbird image. Through the analysis of the extracted information, the paper considers: the geologic structure of Fengjie County is complex, and lithology is crashed; the terrane in the canyon segment is fairly stable; the terrane in some segments of the southern bank will be less stable after the water is stored, because the rock is in the same direction and is apt to slip with human project.