In recent years, the landslide disasters occurred frequently because of the seismic activity. It brings great harm to people's
life. It has caused high attention of the state and the extensive concern of society. In the field of geological disaster,
landslide information extraction based on remote sensing has been controversial, but high resolution remote sensing image
can improve the accuracy of information extraction effectively with its rich texture and geometry information. Therefore,
it is feasible to extract the information of earthquake- triggered landslides with serious surface damage and large scale.
Taking the Wenchuan county as the study area, this paper uses multi-scale segmentation method to extract the landslide
image object through domestic GF-1 images and DEM data, which uses the estimation of scale parameter tool to determine
the optimal segmentation scale; After analyzing the characteristics of landslide high-resolution image comprehensively
and selecting spectrum feature, texture feature, geometric features and landform characteristics of the image, we can
establish the extracting rules to extract landslide disaster information. The extraction results show that there are 20 landslide
whose total area is 521279.31 ㎡.Compared with visual interpretation results, the extraction accuracy is 72.22%. This
study indicates its efficient and feasible to extract earthquake landslide disaster information based on high resolution
remote sensing and it provides important technical support for post-disaster emergency investigation and disaster
assessment.
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