Temporal and spatial distribution characteristics of vegetation index in Shaanxi province using MODIS NDVI products

• 1、College of Information and Electrical Engineering, China Agricultural University/Key Laboratory of Agricultural Information Acquisition Technology of Ministry of Agriculture, Beijing 100083, China
• 2、Shaanxi Provincial Meteorological Bureau, Xi'an 710014, China

Abstract：This paper is mainly on analyzing the temporal and spatial distribution characteristics of NDVI (normalized difference vegetation index) in Shaanxi province using MODIS-NDVI time series data from 2001 to 2011. The results show that the NDVI is relatively stable in most areas of Shaanxi province, and there is small extended increasing trend in the past 11 years. The yearly average values of NDVI in Shaannan are larger than those in Guanzhong plain, and the values in Shaanbei are the smallest. In addition, the variations of NDVI appear obvious seasonal characteristics in one year, that is, the values of NDVI reach their maxima in summer and minima in winter, meanwhile, the values in spring and in autumn are similar. In spatial distribution, the NDVI increases gradually from north to south, and it increases significantly in Shaanbei (especially in southeast of Yulin city and in northern of Yan'an city). The Guanzhong plain and Shaannan maintain firmly in added state, but the NDVI of Xi'an city declines.

Keywords： MODIS NDVI Temporal and spatial variation Shaanxi province