Vegetation coverage changes of alpine grassland based onremote sensing technology

Abstract: Based on the dimidiate pixel model and 3S technology (GIS, RS, GPS), an improved vegetation coverage simulated model was built by using NDVI vegetation index. The MOD09A1 of MODIS data was used to estimate the cover of alpine grassland in the Gannan region by 5 levels in 2000, 2004 and 2008. This study showed that the cover of alpine grassland in the Gannan region generally reduced from 2000 to 2008.The degradation of the first level vegetation is serious, and the main change of grassland vegetation cover indicated the better grassland with the first and second level cover turned into worse grassland with the fourth and fifth level cover. As a whole, this study showed that grassland in the Gannan region was in the status of degradation, which would provide valuable and effective advices for government for decision making.