基于GIS、RS的西藏墨脱高等级公路工程地质勘察

以ETM 图像为信息源，以基于地学知识的地学遥感解译及图像识别技术为主要方法，结合数字图像处理技术和地理信息技术，在图像波谱分析的基础上，选择TM4(R)、3(G)、2(B)波段组合与TM8融合图像为基础底图，在ENVI及ARC／INFO平台下，对墨脱公路方案线廊带的工程地质信息进行图像识别、机助解译及专题制图，取得了较好的应用效果。

GIS/ RS-based Engineering Geologic Survey for the High-rank Highway in Motuo County, Tibet

Motuo County, Tibet, is located in the middle and lower reaches of the Brahmaputra Valley on the southeastern side of Mount Nanjiabawa, the main peak in the eastern segment of the Himalayas. The county is the only county without highway in China due to the precipitous mountains, deep valleys, peculiar climate, geographical location and natural environment, complicated geological settings, violent neotectonics, frequent occurrence of geologic disasters, such as debris flows, landslides, snow avalanches, etc. Therefore, to apply RS and GIS can rapidly and accurately reveal the regional geologic and hydrogeologic conditions, neotectonics, spatial distribution of geologic disasters along the highway, and can provide the scientific basis for the alignment, designing and construction of the high-rank highway in Motuo County. In this paper, the engineering geologic information along the alignment of the high-rank highway in Motuo County is extracted with digital image processing and geographical information technologies by taking the ETM+ images as the information sources and the TM 4, 3, and 2 composite images fused with TM8 as the fundamental maps based on the geoscientific knowledge, image recognition, computer-based interpretation, and the ideal results on the platforms of ENVI and ARC/INFO softwares are obtained.