基于Landsat-8影像数据的北京植被覆盖度时空特征与地形因子的关系

以北京市为研究区,通过像元二分法模型,基于Landsat-8影像,反演北京市2014年4月、2021年4月的植被覆盖度;并根据DEM数据,计算研究区的坡度、高程数据,将植被覆盖度与坡度、坡向、高程进行空间叠加分析,研究植被覆盖度时空特征与地形因子的关系.研究结果表明,北京市坡度较小的区域以中低植被覆盖区为主,随着坡度的...

Relationship between temporal and spatial characteristics of vegetation coverage and topographic factors in Beijing based on Landsat-8 image data

Based on landsat-8 images,the vegetation coverage of Beijing in April 2014 and April 2021 was retrieved by using the pixel dichotomy model.Data of slope and elevation in the study area were calculated on the basis of DEM data,and spatial superposition analysis of vegetation coverage with slope,aspect and elevation was carried out so as to study the relationship between temporal and spatial characteristics of vegetation coverage and topographic factors.The results show that the area with lower slope is dominated by middle and low vegetation coverage,and the area with higher vegetation coverage increases with the increase of slope.Slope aspect has little effect on vegetation coverage.Areas with lower elevations have lower vegetation coverage,and when elevations are increased to a range suitable for vegetation growth,vegetation coverage also increases.The vegetation coverage in Beijing in April 2021 was significantly higher than that in April 2014,indicating that the ecological construction in Beijing has achieved obvious results and the ecological environment has been significantly improved in the past seven years.