Monitoring and spatio-temporal evolution researching on vegetation leaf water in China

Water plays an important role in the growth of vegetation. The research on vegetation water content is necessary to monitor the degree of drought, flood and ecological security. When we observe the large area and need rapidly response, remote sensing has advantage in monitoring and estimating the vegetation water content. NOAA-AVHRR data is usually used by original process of estimating on vegetation water content. Contrast with the former, MODIS is preferred in moderate spatial resolution (250 m, 500 m, 1000 m), moderate spectral resolution (36 spectral bands) and appropriate temporal resolution (national-wide image can be updated in about 2 days). This paper describes the process of retrieving vegetation leaf water based on the GVMI model using the MODIS data, verifies the relation between vegetation water content and index of drought