Research on driving factors of land subsidence with remote sensing technology

Land subsidence is one of the environmental disasters induced by long-term over-exploitation of groundwater in Beijing. In order to keep sustainable social-economic development, this article analyzed the correlation between nature-human activities coupled factors and land subsidence on basis of remote sensing images and in-field data. At the same time, to obtain the principle driving factors of land surface sink, this paper chooses seven factors including the property of unsaturated zone, distribution of faults, precipitation, bedrock burying depth, build-up area, groundwater annual exploitation intensity and groundwater level, as natural-human coupled factors, which are relative main factors inducing land subsidence. And Principal Components Analysis (PCA) method is utilized to analyze the contribution of these factors to surface subsidence in Shun Yi district.