Ecological vulnerability assessment based on remote sensing ecological index (RSEI): A case of Zhongxian County, Chongqing

The ecological vulnerability evaluation index was established through Normalized Difference Vegetation Index (NDVI), Wetness (WET), Build-up and Soil (NDBSI) Land Surface Temperature (LST) indicators, comprehensively evaluate the of Zhongxian County Chongqing in 2002, 2009, 2016 by Principal Components Analysis (PCA), analyze its spatio-temporal evolution. areas five levels were calculated respectively, overall also calculated. remote sensing (RSEI) decreased first then increased; showed an upward trend; increased decreased; decreased. body (EVBI) shows a downward trend, incremental changes are mainly concentrated negligible light area, while medium vulnerability, strong extreme area generally show trend. Furthermore, new increment grade concentrates on from 2002 to 2016. In general, gradually shifts low environment tends develop healthily.