期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B6b
页码：207-212
出版社：Copernicus Publications
摘要：Vegetation index is one of the important parameters describing the land cover characters while remote sensing is generally used in getting regional vegetation index. In this article TM remote sensing data is used to acquire vegetation coverage of Miyun County with NDVI as one parameter in 1991 and 1997 respectively. It indicates that the average vegetation fractional coverage in Miyun County decreases in 1970s, from 53.46% to 51.59%, the effective vegetation coverage decreases from 23.89% to 15.54%. Besides the effect of natural factors such as temperature and precipitation, the effect of human activities on the change of land use structure is the main reason. As a result, the area of grassland and farmland decreases and the area of unused land increases while the former decreases by 15.80% and 2.87% respectively the latter increases by 5.35%. It is very important to keep and make full use of grassland and strengthening the management of unused land
