A Study On Heat Island Effect Based On Remote Sensing

Heat Island Effect is defined as phenomenon of difference in temperature that urban temperature is higher than suburban temperature, highly influenced on environmental ecologic system and production activity of human being. In these years with high development of spatial information technology represented by 3S(RS,GIS,GPS), because satellite remote sensing can obtain the detail information of the surface in all-weather that other methods cannot provide with, this technology have been applied to environment science, which becomes a new hotspot. In this paper RS is applied to research on HI taking Guangshui area and Wuhan City as examples. Case 1 adopting the ETM+ data production receiving from US Landset-7 on July 9, 2002, and transition every wavelength region data into the workable IMG file through ERDAS IMAGINE software; in term of NDVI and the surface Temperature-Derive method, building the NDVI Spatial model, Radiant Temperature Spatial model and creating NDVI graph and Radiant Temperature graph, studying on the relation between NDVI and the surface Radiant Temperature of area of Guangshui using fitting method, quantitative analysis on Heat Island Effect of Guangshui area. As a result, the relation between the surface Radiant Temperature and NDVI of Guangshui area is accordance with inverse proportion of linear relativity, further adopt the advanced research method in domestic ——Thermal Landscape method, analyze the Heat Island Effect of status quo and pattern of Guangshui area. The result shows thermal landscape characteristic of Guangshui area takes the cool green-land as matrix, although the urban Heat Island of Guangshui is obvious, dominance index of Heat Island Effect is less, which feebly influences on the whole area. This research prove inverse proportion of linear relativity between the surface Radiant Temperature and NDVI, this conclusion and the result of thermal landscape provide with the theory foundation on solution of relieving Heat Island Effect of area . Case 2 based on qualitative analysis the Heat Island Effect of Wuhan city in 1980s, further compare between the Heat Island Effect of Wuhan city in 2000 and 1980s; primarily shows increasing the Heat Island Effect of Wuhan city the first reason why the rapid growth of population, the construction density, the request of energy and the sharp reducing of forest and water area in Wuhan city. The result provides further quantitative analysis and solution on relieving the HI of Wuhan city with support. This paper provide a novel method expressing the Heat Island Effect of based on RS——Radiant Temperature 3D showing method, which is applied to Guangshui area. The images indicate this method can express the Heat Island Effect more directly and clearly.