Abstract: The advantage of MODIS vegetation monitoring was analyzed. The methods for establishing time series of vegetation indicator by using MODIS data in Shaanxi Province were discussed. According to the main types of vegetation-cover in Shaanxi Province, five specimen counties were selected in desert steppe, cropland and forestland regions. The NDVI parameters of character curve by MODIS NDVI series data in 2004-2005 were distilled. The rule of crop phonological stages and indexes of growing evaluate, explore the method of vegetation dynamic monitoring in Shaanxi province by remote sensing method were put forward, combined with the meteorology observation data and the summarized seasonal dynamics change character in the desert steppe, cropland and forestland. Finally, the problems and improvements of the method were discussed. The results showed that a significant relation existed between desert steppe NDVI and monthly precipitation. In the forestland NDVI had relation to the monthly temperature, but less sensitive to the precipitation. Time series of NDVI profile could reflect the dynamics of crop growth and development. It could be used to monitor and assess the growth and development of crops combined with crop phonological stages.

Key words: MODIS, MODIS, Shaanxi, Vegetation, Seasonal dynamics change