VSWI Retrieved and Compared between TM and MODIS

In order to present the difference between VSWIes(Vegetation Supply Water Index) retrieved from different remote sensing data,VSWIes abstracted from Landsat TM and EOS MODIS data of Hebei province in North China are calculated and compared.At first,NDVI(Normalized Difference Vegetation Index) and LST(Land Surface Temperature) are calculated from the two remote sensing sources respectively.And then VSWIes are retrieved and compared.Finally,the following conclusions are be drawn:① On September 8,2004 in the study region,the difference between TM VSWI and MODIS VSWI is changing from-0.51 to 0.20,and the negative values are mainly happened in towns,bare fields and water bodies;② In vegetation cover areas,TM VSWI is often bigger than MODIS VSWI,but the difference is little;③ The minimum,maximum and average values of the difference between TM VSWI and MODIS VSWI present the same trend: the values are increasing with the increase of vegetation coverage.The conclusions of this paper are helpful for recognizing VSWIes difference between TM and MODIS and can provide important information for fusion of the drought indices extracted from the two different sources.