基于TM影像的代县植被覆盖度动态变化监测

以ERDASIMAGINE系统为操作平台，利用忻州市代县地区2000年和2007年两期TM卫星影像数据，通过对遥感图的几何校正，图像融合，监督分类等处理，对区域植被覆盖状况进行了提取和分析。结果表明：2007年低程度植被覆盖比2000年减少了6834．3hm2，中程度植被覆盖增加了2777．2hm2，高程度植被覆盖增加了4050．8hm2；人类活动和自然因素的变化均是代县地区植被覆盖变化的主要原因。研究表明，利用TM影像并结合erdas计算归一化植被指数NDVI，从而提取植被覆盖度的方法，可以快速准确地对区域植被生长状况进行动态监测。

Dynamic Monitoring of Vegetational Cover in Daixian Area Based on the TM

Based on the software of ERDAS IMAGINE, combining the TM image of Dai County, Xinzhou, the paper does a series of processing, such as geometric correction, image fusion and supervised classification, extracts and analyzes the data of the vegetation. The results show that the number of low level vegetation cover reduces 6834.3 hectare than that in the year of 2000, the number of moderate level vegetation cover increases 2777.2 hectare, the number of high level vegetation cover increases 4050.8 hectare. The main reason for the vegetation cover change in Dai County is the change of human activity and natural factors. The research shows that the method using the TM images and erdas calculate the NDVI, and then to extraction of vegetation coverage can rapidly and accurately dynamic monitoring the regional vegetation growth.