A Calculation Method for Urban Heat Island Intensity:A Case Study on Hefei City

Urban heat island is a phenomenon related with the fact that the urban upper air temperature is higher than the surrounding area.The intensity of the urban heat island is an important index for the urban heat environment.But there is few studies on the calculation of the urban heat island intensity at present.In this paper, the brightness temperature of the case image in Hefei city is calculated based on the theory of Remote Sensing.The urban construction land is considered at the same time.The spatial distribution of the urban heat environment is analyzed and a calculation formula is obtained by using the fractal theory and the improved radius method.It is shown that there is a jump in the horizontal distribution of the brightness temperature between the urban built-up area and non-built up area.Then the intensity of the urban heat island is computed.The attention is focused on the spatial distribution features of the urban heat environment.This method avoids the confusion of having to find the temperature in the suburban, and it is an important point in the studies on the intensity of the urban heat island.