关键词: 高分辨率数字正射影像地图, 地质灾害, 解译标志, 麦积区幅, 黄土滑坡

Abstract: The vigorous development of domestic highresolution remote sensing make it possible to extract information of geologic hazard like morphological structure and components and composition of elements, and to carry out remote sensing investigation of geological hazards in ruthless area, and so on. In this article the geological disaster was visually interpreted in Maiji sheet based on highresolution Digital Orthophoto Map(DOM). Combined with field surveys, this study proposes the image characteristics of loess landslide, collapse and debris flow. The main interpretation keys of loess landslide are roundbacked armchair landform, shadow and white stripes of slip cliff, and the discontinuity of terrace with same height at the line of landslide limitation. Collapse and debris flow can be interpreted by outline and tone of geological disasters.Results show that DOM is an ideal source of remote sensing data for geological disasters interpretation in loess area; mudslides and landslides can be interpreted with a high accuracy and the accuracy of collapse interpretation is relatively lower; the accuracy of undetected rate is as following, landslides＞mudslides＞collapse. At last a discussion on the reason was carried out.

Key words: highresolution digital orthophoto map, geological disaster, interpretation key, Maiji sheet, loess landslide