The Monitoring Method Application for Vegetation Dynamic Changes Based on TM and ETM~+ Images

摘要

The paper studies the method application to estimate vegetation pixel by using normalized difference vegetation index and the threshold parameter of the near infrared. It is applied for the experiment of the vegetation extraction in Tangshan city by using TM and ETM~+ images. The graph of vegetation information and the graph of vegetation dynamic change were generated according to images in three different periods. It can be concluded that the vegetation coverage area with park has been increased primarily in Tangshan city and the city scale has experienced peripheral expansion in the past 10 years. This method turns out to be correct and effective, as the result is consistent with the actual development of Tangshan city.