Spatio-temporal variation and characteristics of fractional vegetation cover in Yangtze River Delta based on GEE
In recent years,the Yangtze River Delta region,with the most economic activities in China,has been focusing on the green integration of ecological environment development. However,the rapid development of the region will certainly have an important impact on the ecological environment,so how to select indicators for quantitative change and trend analysis of the ecological environment is an important issue. Therefore,based on the Google Earth Engine cloud platform,this paper studied the Yangtze River Delta and used Landsat surface reflectivity data and moderate-resolution imaging spectroradiometer (MODIS) enhanced vegetation index (EVI) data from 2000 to 2020 to calculate fractional vegetation cover (FVC) by pixel binary model. The spatio-temporal evolution trend of FVC in the Yangtze River Delta region of China was predicted and analyzed according to interannual variation and the Hurst index. The results show that the FVC in the Yangtze River Delta region increases from 0.602 in 2000 to 0.669 in 2020. It is at the medium-high coverage level and shows a steady improvement trend. From the perspective of spatial distribution,the regions with higher FVC are the southwestern part of Anhui Province,the central and southern part of Zhejiang Province,and the northwestern part of Jiangsu Province. The average Hurst index of regional FVC is 0.525,and the ecological environment will continue to be improved in the future. The results can provide a reference for the follow-up research on ecological environment change and environmental collaborative control.
fractional vegetation coverspatio-temporal variationGoogle Earth EngineYangtze River Delta
万方数据
维普
