基于NDVI的兰州市城关区植被覆盖度变化研究

Study on the Changes of Fractional Vegetation Cover in Chengguan District of Lanzhou City Based on NDVI

基于遥感和地理信息系统技术,利用2000年Landsat5 TM和2015年Landsat8 OLI两期遥感影像,提取兰州市城关区不同时期的归一化植被指数(NDVI),运用像元二分模型估算了植被覆盖度(FVC),分析了2000~2015年城关区的植被覆盖状况及动态变化情况。结果表明,15 a间城关区低植被覆盖度(0<FVC≤15%)和中植被覆盖度(15%<FVC≤40%)分别增加9%和15%,中高植被覆盖度(40%<FVC≤70%)和高植被覆盖度(70%<FVC≤100%)分别减少17%和9%;植被覆盖度增加面积约10 km^2,减少面积约21 km^2。

Based on RS and GIS, using the remote sensing data of 2000 and 2015 year, this paper computed the normalized difference vegetation index(NDVI) and the fractional vegetation cover(FVC), and studied the dynamic changes of FVC in Chengguan District of Lanzhou City from 2000 to 2015. The results show that from 2000 to 2015, the area of low and middle FVC increased by 9% and 15%, middle-high and high FVC reduced by 17% and 9%, the increased area of FVC is 10 km^2, and the decreased area is 21 km^2.