Dynamic Monitoring of Vegetation Fraction Change in Jilin Province Based on MODIS NDVI
基于MODIS NDVI的吉林省植被覆盖度动态遥感监测

As a comprehensive quantitative indicator of surface conditions covered by plant communities,vegetation fraction and its changes become an important instruction of regional environmental changes,which has great significance for the regional hydrology and ecological conditions and even the regional response to global changes.In this paper,MODIS NDVI was selected as the data source to finish the extraction of vegetation fraction in Jilin from 2000 to 2007 and vegetation fraction maps from different periods using the two sub-pixel model.It also makes further analysis on the reason for the changes of vegetation fraction.It shows from the results that the vegetation fraction,which is best in Baishan,decreased gradually from east to west in Jilin.Over the past eight years,the overall trend of vegetation coverage in Jilin was on the rise,and the highest had reached 83.04% in 2007.During the period,the vegetation coverage in both central and western regions had increased 9 797.52 km2,accounting for 74.79% of the total area changes.The main factors affecting the changes of vegetation cover are those,the ecological restoration engineering,the precipitation,the temperature and so on.