Heat Island Effect In Guiyang City Based On Remote Sensing Data

Urbanization is the contemporary tendency of social development, tailed after which, the urban heat island effect has caught a lot of attention. The quantification, analysis and evaluation of urban heat island effect have become one of the most important tasks in the field of urban climate and environment study. Conventional climate monitoring method only processes data collected from limited weather stations by interpolation and calculation so as to get the temperature and average temperature in the other areas as well as in the whole city, which is in its nature bottleneck-suffered because of data shortage and as a result fail to reach satisfactory achievement in the general observation and analysis of urban heat island distribution. With the development of science and technology, remote sensing data have won researchers'favor by its amazing data capacity, large coverage ability and unprecedented time effect. Various empirical formulas have been created to retrieve temperature from the radiance info loaded within the remote sensing images and reached satisfactory results.This paper retrieves from TM image the heat island distribution in Guiyang, a city crowned as the Tourism and Forest City in China, by building models of the matured Mono-Window Algorithm (MW) and Single-Channel Algorithm (SC). Result shows the MW algorithm better represents the real temperature. This research proves not only that Guiyang enjoys a mild climate but also that there are 2 different types of heat island within it. One is the normal island located inside of the city and county areas and the other is an abnormal one resting in the natural suburban area and even claims noticeably larger area than the former. Base on remote-sensing images of different seasons, this paper analyses and quantities this unique heat island effect and proves the existence of abnormal one in a real sense and relate the cause to the karst ecological environment of this city. After the removal of elevation impact on temperature of mountainous area, this paper quantitatively explores the correlation of temperature and vegetation especially that of the karst area. After all the analysis and deduction, this paper concludes that the heat island effect in Guiyang city largely lies in the scarcely vegetated karst area and the problem-solving solution goes together with the rehabilitation and management of desertificated karst area.