The Study Of UHI And The Relationship Between It And LUCC Based On TM And ETM Data

The urban heat isla nd (UHI) refers to the phenomenon of higher atmospheric and surfacetemperatures occurring in urban areas tha n in the surrounding rural areas due to energyconsumption and reduction of urban green space. It has changed the urban heat environmentand induced a series of ecological and environmental problems . In addition , urban heat isla ndeffect has a very important contribution to globa l warming from macroscopic level. It hascaused widespread concern. The study of urban heat isla nd has become a new hot spot forresearch of clima tic, ecological, environmental issues .We have a quantitative study on temporal and spatial distribution of urban heat isla nd andthe relationship between it and land use / la nd cover change. In this paper, the capital of JilinProvince - Changchun , has been selected as the study area. The la nd surface temperatureretrieve d used a method proposed by Artis & Camahan. On this basis , we first analyzed thecenter distribution of urban heat isla nd , then determine heat isla nd phenomenon whether thereis by analysis of LST retrieve d from remote sensing ima ges obtained at different times , andcompare the changes in heat isla nd effect of Changchun at the same season in different years atlast. The results show that heat isla nd effect of Changchun has a clear center distribution.Although there are seasona l changes, due to certain conditions, heat isla nd phenomenon doesnot appear in the season that it should occur. However, the heat isla nd effect of Changchun hasgreat annual and seasona l changes and markedly enhance with the accelera ted process ofurbaniza tion. Moreover, Underlying Surface as one of the important huma n factors on theimpact of urban heat isla nd effect and the changes of heat isla nd effect brought by land use /la nd cover change is another focus of our research. Through the establishment of correla tionanalysis between vegetation covera ge and the LST, between impervious surface componentand LST, found that vegetation covera ge and the LST has a nega tive correla tion, but hasobvious seasona l effect. The urban impervious surface component and the LST significa ntlypositive correla tion, has little to do with the seasons but high correla tion. Therefore, vegetationcan reduce heat isla nd effect and impervious surface can enhance the heat isla nd effect. It wasfound that there is a very close relationship between land use / la nd cover changes and thechange of la nd surface temperature.