Analysis on Time-series NDVI of 2011 Based on MODIS in Chonqing

In this paper, serial data of daily Normalized Difference Vegetation Index (NDVI) cloudless day from March to November 2011 in Chongqing was used, and Time-series NDVI such as a period of ten days' (or monthly/yearly) maximum NDVI under cloudless day was obtained. The serial NDVI with different period of time were divided into 6 characteristic districts according to altitude. The results of the analysis showed as following: growth of vegetations had obvious seasonal variation that the number of NDVI was gradual increase during March to April, and was bigger during May to September, gradually decreased after October. From mid-August to mid-September, and the NDVI of the Middle and West of Chongqing was less than normal owing durative drought. The NDVI was increased with increasing of highness and NDVI increaseed rapidly below 1500m while increased slowly above 1500m that showed better was the ecological environment, higher was the altitude.