基于Landsat影像的北京市植被覆盖变化特征分析

Analysis of Vegetation Cover Change in Beijing City Based on Landsat Lmage

以北京市为研究区,基于2000年Landsat 5TM和2010年Landsat 5TM遥感影像数据,利用像元二分模型对2000年至2010年北京市植被覆盖度及其动态变化进行定量分析。研究表明：2000年,北京市植被覆盖度主要为低植被覆盖、中等植被覆盖和中高植被覆盖;2010年,北京市植被覆盖度主要为中高植被覆盖和高植被覆盖。2000~2010年10年间,高植被覆盖和低植被覆盖区的变化程度最大,前者增加3066km2,约占北京市总面积的18.25%,后者减少2103.36km2,约占北京市总面积的12.52%,其余等级植被覆盖区域面积变化程度相对较小。2000年,低植被覆盖的面积最大,2010年,中高植被覆盖的面积最大。10年间,以中等植被覆盖→中高植被覆盖为最主要的转换类型,转换率达到45.501%。

Taking Beijing as the study area which is based on the Landsat 5 TM in 2000 and the Landsat 5 TM in 2010 remote sensing data,using the dimidiate pixel model to determine vegetation coverage and analyse its dynamic changing from 2000 to 2010. The study shows that in 2000, the vegetation coverage in Beijing is mainly low vegetation coverage, medium vegetation coverage, middle and high vegetation coverage;While in 2010, the vegetation coverage in Beijing is mainly middle and high vegetation coverage and high vegetation coverage. During the 10 years between 2000 and 2010, high vegetation coverage and low vegetation coverage are of the biggest changing, the former the former increases 3066 kmz , accounted for 18.25% of the total area of Beijing City, the latter decreases 2103.36 kmz , accounted for 12.52% of the total area ,all other levels of vegetation coverage area change degree is relatively small. In 2000, the area of low vegetation coverage was the largest, and in 2010, the area of high vegetation cover- age was the largest. In the ten years, the middle and high vegetation coverage was the most important conversion type, the conversion rate made up 45. 501%.