利用MODIS-NDVI进行沙化土地评价研究--以陕西省北部地区为例

The application of remote sensing technique to sandy desertification assessment based on MODIS data——Taking North Shaanxi as an example

利用新一代卫星遥感MODIS影象数据,结合地面调查数据,对2006年5月份MODIS影象数据的归一化植被指数(NDVI)进行了植被专题信息的提取,与植被覆盖度建立线性回归模型,得出陕西省北部地区的沙漠化土地分级图。分析结果表明该分级图与陕北植被空间变化特征有很强的一致性。该方法适宜于以地面调查数据为基础的植被盖度提取,为遥感技术在沙化土地评价中应用提供了有效途径。

Making use of the MODIS data of the new generation satellite remote sensing and combining with inquisition data in the ground at the same time, we withdrew information about the vegetation coverage using the NDVI in May,2006. And then, we built the linear regress model and the ratings diagram of the sandy desertification evaluation in the north area of Shanxi Province. The results of our analysis shows that the ratings diagram has very strong coherence with the characteristics of the vegetation space changes in the north area of Shaanxi Province. Our research is built on the basis of the land surface research data and it provides an effective way of assessing sandy desertification of remote sensing technology.