基于遥感技术的植被覆盖度的动态监测

Dynamic Monitoring of Vegetation Coverage Based on Remote Sensing

植被覆盖度可以反映地表的植被状况,研究植被覆盖度变化对及时掌握生态环境变化有着重要的作用。以山西省太谷县为研究区,以1990,2001,2009年3期TM遥感影像为数据源,基于像元二分模型,对太谷县的植被覆盖度进行遥感估算,分析了植被覆盖度的时空变化特征。结果表明,1990,2001,2009年太谷县植被覆盖均以中覆盖度植被为主,分别占全县面积的42.55%,34.64%,43.91%;近20 a来,太谷县高覆盖度植被面积稳步增加,且主要分布在平原区;2001—2009年低覆盖度植被逐步向中高覆盖度植被转移。说明太谷县各项生态工程显示出明显成效,生态环境不断改善。

Vegetation coverage can reflect the status of vegetation,the vegetation coverage change has important effect to timely grasp the ecological environment changes. Taigu county in Shanxi province as the research area,this paper in 1990,2001,2009 of the three periods of TM remote sensing image as data sources,the dimidiate pixel model was applied to calculate the regional vegetation fraction degree and analyzed the spatial and temporal variation characteristics of vegetation coverage. The results showed that normal vegetation coverage was mainly in Taigu county in 1990, 2001 and 2009, accounted for 42.55%, 34.64%, 43.91% of the county area; over the past 20 years, Taigu county high vegetation coverage area was growing steadily, and mainly distributed in the plains. From 2001 to 2009,low vegetation coverage gradually shifted to high vegetation coverage, which indicated that the ecological engineering Taigu county showed significant results, improving the ecological environment.