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Geoscience ›› 2017, Vol. 31 ›› Issue (05): 930-942.

• Research on the Main Geohazards and Engineering Geological Problems Along the SichuanTibet Railway • Previous Articles     Next Articles

Remote Sensing Interpretation of Large Landslides Along Sichuan-Tibet Railway Based on Object-oriented Classification Method

SU Fangrui1,2(), GUO Changbao2,3(), ZHANG Xueke2, SHEN Wei1, LIU Xiaoyi2, REN Sanshao1,2   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083,China
    2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
    3. Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resources, Beijing 100081, China
  • Received:2016-10-12 Revised:2017-06-10 Online:2017-10-10 Published:2017-11-06

Abstract:

The Sichuan-Tibet Railway is located in the Middle and East of the Tibetan Plateau, where the landforms and geological structures are very complicated. The large scale landslides are densely developed in this area, and they have caused serious human life casualties and losses of major projects. Based on the zonal remote sensing image data, taking the example of Chashushan landslide, 102 Daoban landslide, Nujiang landslide and Luanshibao landslide along the Sichuan-Tibet Railway, this study takes the method of object-oriented classification to analyze the remote sensing information of landslides by use of high resolution WorldView-2 and Landsat TM remote sensing image data on the ENVI5.1 and eCognition software platforms. The result shows that the key information and target area can be extracted by object-oriented classification method, and combined with visual interpretation the details of landslides can be obtained, which can improve the success rate of landslide interpretation. It is of great significance to the landslide survey in the complicated geological conditions along Sichuan-Tibet Railway. Finally, this study combined the grey-level co-occurrence matrix (GLCM) and normalized difference vegetation index (NDVI) to discuss the identification of the ancient landslide and the reactive landslide, and on this basis supposed to put forward the GVI model and constructed the mass function IGVI of GVI model. The results of statistical samples show that the IGVI value of the ancient landslide is lower than that of the reactive landslide, indicating that the GVI model proposed in this paper can provide a basis for identifying the ancient landslide and the reactive landslide.

Key words: Tibetan Plateau, object-oriented classification, large landslide, high resolution remote sensing image, landslide extraction

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