基于MODIS影像的山西省植被指数分析

以MODIS遥感影像为数据源，利用ENVI遥感影像处理软件，笔者对山西省2005年9月和2006年9月两期MODIS影像的植被指数进行计算，建立了两期植被指数密度分割模型，以获得全省植被覆盖的整体状况，通过对两期植被指数影像图进行动态链接、叠加以及结合相减比较，可以看出两年间全省的植被覆盖空间变化情况。结果表明：全省较低植被覆盖区不多，高植被地区主要分布在中部以南地区，中低植被覆盖集中在中部以北地区。两年的植被指数比较结果表明，全省中等植被覆盖区有所增加，但高植被覆盖区增加不明显。

Vegetation Index Analyses of Shanxi Province Base on MODIS Remote Sensing Image

Considering the MODIS remote sensing image as data source, and using the ENVI remote sensing image processing software,the indexes of MODIS images in September 2005 and September 2006 in Shanxi province are calculated,density slice models of the two periods＇ vegetation indexes are constructed and the general situation of vegetation fraction can be obtained. Through the dynamic linking, overlay, and subtraction between the two vegetation index images, the spatial change situation of vegetation fraction in the whole province during the two years can be seen. The results showed： low vegetation fraction areas are not too many ; high vegetation fraction areas are mainly distributed in the north of middle area; medium vegetation fraction areas are collectively distributed in the south of middle area. Compare results of two years＇ vegetation index indicated： in the whole province,the medium vegetation fraction areas got some increase, while the high vegetation fraction areas increased non- obviously.