基于NDVI的南昌市植被覆盖度时空演变分析

Analysis of temporal and spatial evolution of vegetation coverage in Nanchang based on NDVI

植被覆盖变化能够间接反映生态环境质量的变化,对一个地区的生态系统稳定和物种多样性还有社会经济发展有着重要的意义。研究下载了南昌市1995、2005、2013和2017年的遥感数据,通过归一化植被指数(NDVI)求取植被覆盖度,分析了南昌市长时序的植被覆盖时空变化特征。结果表明:4个时期均是高植被覆盖度所占面积最大;近22年,植被覆盖度总体上在降低,主要集中在高和较高两个级别上,无植被覆盖的区域面积总体上在增加,绿地面积正在萎缩。

Vegetation cover changes can indirectly reflect changes in the quality of the ecological environment,and are of great significance to a region’s ecosystem stability,species diversity,and socioeconomic development.In this paper,the remote sensing data of Nanchang City in 1995,2005,2013 and 2017 were downloaded,and the vegetation coverage was calculated by the normalized vegetation index(NDVI)to explore.The results show that:the area of high vegetation coverage is the largest in four periods;In the past 22 years,the vegetation coverage has generally been reduced,mainly at the high and high levels,and the area without vegetation coverage is generally on the increase,the area of green space is shrinking.