典型植被指数与地表温度空间特征分析——以桂林市为例

以桂林市为研究区,利用TM卫星影像数据提取3种典型植被指数(NDVI、RVI、TNDVI),并反演研究区的地表温度(LST);从不同土地利用类型和城市空间上分析各个参数的统计学特征,同时定量分析植被指数与地表温度之间的线性关系。研究结果表明:在整个区域上,以林地和农田地物为主体的城市郊区具有较高的植被指数值,不透水层比例大的城市建成区则具有较高的地表温度。另外,典型植被指数与地表温度相关性分析揭示,各植被指数与地表温度都呈较显著的线性负相关。相对于城市郊区,下垫面性质改变与植被覆盖密度偏低是导致城市建成区"热岛效应"形成的重要原因。

Analysis of Spatial Characteristics between Vegetation Index and Land Surface Temperature: A Case Study in Guilin City

Taking Guilin city as an example,three kinds of vegetation Index(NDVI、RVI、TNDVI) are extracted and the LST was calculated by inversion based on TM images.This paper analyzes the statistical characteristics of various parameters from different types of land use and the city space,and discusses quantitatively the linear relationship between vegetation Index and LST.The results show that Forest land,farmland and city suburbs have higher vegetation Index,the built-up with more proportion of Impervious layer has higher surface temperature,vegetation Index and LST have a significant negative correlation.Compared with suburban,the changes of ground characteristics and low vegetation coverage contribute most to the urban heat-island effect in urban built-up areas.