基于归一化建筑指数的北京市城市热岛效应分布特征

Distribution of urban heat island effects based on normalized difference built-up index in Beijing city

以北京市为研究区域,以Landsat TM影像为基础数据,定量反演亮度温度(Tb),提取归一化建筑指数(NDBI),并利用RS和GIS技术在东北-西南和西北-东南方向构建多个特征剖面,探讨Tb与NDBI的关系在空间上的分布规律。结果表明:(1)Tb和NDBI存在明显的正相关关系。(2)剖面上Tb与NDBI相关性的显著程度呈现由中心剖面向边缘剖面递减的格局。(3)剖面上Tb与NDBI相关性的显著程度受下垫面土地利用结构的复杂程度影响,土地利用结构越复杂,特征剖面上Tb与NDBI的相关性越显著。研究结果较好地揭示了建筑与温度相关性的空间分布规律,可为北京市未来的城市、绿地等规划提供一定科学依据。

In this paper, brightness temperature （Tb） and normalized difference built-up index （NDBI） were quantitatively derived from Landsat TM images of Beijing City. Feature profiles of Tb and NDBI were drawn in the directions of NE-SW and NW-SE with the technologies of RS and GIS. Laws of spatial distribution of the relationship between Tb and NDBI were discussed. The results show that： （1） there is a significantly positive correlation between Tb and NDBI. （2） The less distance between the other profiles and the central profile is, the stronger the negative correlation between Tb and NDBI is. （3） The relationship between Tb and NDBI is affected by the complexity of land use structure. The more complex the land use structure is, the stronger the relationship between Tb and NDBI is. This paper effectively reveals the spatial correlation between building and temperature, and thus can provide certain scientific supports for Beijing＇s urban planning in the future.