基于MODIS数据评估沈阳市植被的变化特征

Interannual variability of vegetation growing characteristics has very important significance for the study of city resources, environment, ecological problems . Using MODIS data, this paper extracted nearly 11 years vegetation index data in August of each year from 2001 to 2011 in shenyang . Based on condition of NDVI characterization of vegetation growing , degree of vegetation growing can be divided into five grades. The degree of the changes of NDVI are divided into eight grades. Analysis of distribution characteristics of vegetation growing in August and the change characteristics of vegetation growing in recent 11 years: the changes of the vegetation grew are mostly moderate degradation and slight degradation. The most serious areas of vegetation degeneration in shenyang mostly located in Yuhong, the border between Shenbei and Dadong etc. Slight improvement has a wide distribution area, respectively located in the north new district and Dongling, etc. There are little areas that owns improved vegetation , some citys'vegetables even did not improve. 07's vegetation degradation is particularly obvious, vegetation grew gradually improve after 2007, but areas which are obviously improved are still very few.