The Characteristics of EVI Retrieving from MODIS Data in Chengdu City and the Surrounding Areas During Spring and Summer
Based on the 6S radiative transfer model,the dark target(DT) method proposed by Kaufman(1997) was used to retrieve the aerosol optical depth(AOD) in Chengdu city and its surrounding areas.Then the inversion of enhanced vegetation index(EVI) and the surface reflectance for the VIs calculation was made after atmospheric correction.The characteristics of EVI were also analyzed.The results showed that the aerosol distribution was obviously regional.The values of AOD in the region of Chengdu and the adjacent areas were about 0.8~1.0,as serious pollution and bad diffusion;in contrast,the AOD values of the Xiling Snow Mountains and the Qingcheng Mountains were lower,being 0.2~0.4.Multitemporal profiles of EVI on the surface of various vegetation cover types(city,plantation,sward,forest and others) in Chengdu and its surrounding areas represent their time variation and transitional feature.
NETL
NSTL
万方数据
维普
