Study on Remote Sensing Interpretation for Implicit Landslide in Southeast China
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    Abstract:

    The traditional remote sensing interpretation technique is hard to recognize the geohazard directly in southeast China where the shallow geohazards are dominated. It is because of low level of vegetation and geohazard development regularity. A method of implicit geohazard remote sensing interpretation was proposed to support the geohazard detailed survey with the purpose of improving its efficiency and accuracy. The proposed method aimed to interpret the slopes where the geohzard is prone to occurrence (named as implicit geohazard), instead of the geohazard directly. It included the steps of establishing GIS based working environment, preliminary susceptibility analysis, construction of interoperation rules, determination of interoperation points, zones and important survey regions, and field survey and result verification. The proposed method was applied into a real world study case of geohazard detailed survey in Chun’an county with the scale of 1:50000. The working environment of remote sensing interpretation was established based on ArcGIS. By using the remote sensing images of 0.5m and 1.0m resolution and DEM data with the scale of 1:10000, totally 3025 points and 969 zones were determined. The area of the important survey region was 914.18 km2. The results from the field survey showed that the numbers of geohazard and unstable slope within the interpretation zones and important survey regions were 199 (i.e. 70.3%) and 264 (i.e. 93.3%), respectively, out of totally 283 points. The success rate of remote sensing interpretation is 92.9%. This study revealed that the proposed implicit geohazard remote sensing interpretation method could rigorously delineate the interpretation zones and important survey regions and thus could guide the detailed survey effectively. It also shed some lights on applying the proposed method into large scale geohazard detailed survey in southeast China (e.g. Zhejiang province).

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.2014. Study on Remote Sensing Interpretation for Implicit Landslide in Southeast China[J]. Geological Review,60(6):1376-1380.

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History
  • Received:March 10,2014
  • Revised:August 20,2014
  • Adopted:
  • Online: November 20,2014
  • Published: