干旱区生态环境知识资源中心

This paper focuses on remote sensing information extraction in geological environment survey and disaster evaluation. DMC satellite multispectral data of tsunami area in Sumatran island and Namucuo area in Tibet is selected as the data source. After data processing and synthesis analysis such as fine geometric correction, image. radiation analysis, information enhancement, information extraction, geological interpretation etc., and with the support of the known remote sensing and geological data, the information of Quaternary geology, environment, disaster, desertification in Namucuo Lake and surrounding area is extracted. With regard to tsunami area in Sumatran island, obvious linear and ringed textures in the image are extracted, mapped and analyzed from chromatic aberration of vegetation and texture information, and its geological meaning is interpreted. Northwest fault is the main fault, the smaller one is the northeast fault which is perpendicular to the main fault. Based on that, we have initially analyzed the fracture distribution characters that probably control or induce geologic disasters of the region, and we have also predicted three regions where geological disasters such as debris flow, landslip, landslide etc easily take place and two probable regions where volcanic activities happen. Using DMC satellite data of Namucuo Lake and its surrounding area in Tibet we can recognize lots of information such as lake-face stratum of the Quaternary, bare bedrock, linear feature, two-level and three-level water system, glacier distribution. Through the comparison and analysis of two-period image, we have found four debris flow areas caused by snow melting in the surrounding region of Bingna, Bencuoduo, and Qinglongxiang. In the aspect of land desertification, through image classification, we can extract remote sensing information such as bare ground with grit, meadow, wetland, desertification land (severe, moderate and slight) and alkaline land (moderate and slight) etc. in Namucuo Lake region and its surrounding region. Geological disaster evaluation using DMC satellite data indicates that it not only have huge application potential for disaster monitoring, but also have important application value for geologic environment monitoring.