基于MODIS的西藏荒漠化动态监测研究

Research on dynamic monitoring of desertification in Tibet based on MODIS

为了研究不同植被指数对监测土地荒漠化的动态变化统计结果的差异,以2003年和2009年全年的250 m分辨率的MODIS植被指数产品MOD13Q1为数据源,利用NDVI值作为荒漠化分类的依据,对西藏自治区内荒漠化土地进行研究,得出了2003年和2009年的荒漠化土地面积及其分布图和不同荒漠化等级土地之间的动态变化图并统计其变化面积。研究结果表明:西藏自治区内部分地区荒漠化程度有所减缓,就整体而言其荒漠化趋势不容乐观。而不同植被指数统计结果可为西藏自治区的荒漠化防治提供参考。

To monitor the land desertification in Tibet,250 m resolution MODIS vegetation indices from MOD13Q1 were used to describe the land desertification dynamics in the years of 2003 and 2009,by using the NDVI values as classification reference.The results show that while desertification in some areas was slowed down,the overall trend is not optimistic.This work also shows that vegetation indices can be used as an indicator reference for desertification control in Tibet.