| Summary: | 碩士 === 國立成功大學 === 都市計劃學系碩博士班 === 96 === Because of urbanization people gather and live in the city and thus make huge transportation trips. Lots of vehicle exhausts cause air pollution but being full of artificial architectures and impervious pavements in urban environment make the air and water cycle systems worsen. Nature environment decrease its function of adjusting the air temperature, relatively increase the use of air conditions and higher energy consumption, which derived the phenomenon “Urban Heat Island Effect；UHI”, means the air temperature higher in urban surrounding than in rural space. Recent years, most researches of UHI in Taiwan are focusing on dry seasons in Taipei. By motorcycle-traverse approaches they found the relationship between population scale or park greenery resources and UHI intensities. This paper will take
advantage of remote sensing techniques, possesses the merit of time chronological and widely picturing range, by finding the locations of the highest and the lowest temperature in Tainan with land surface temperature（LST）derived from MODIS
（Moderate-resolution Imaging Spectroradiometer）. Using NDVI（Normalization Difference Vegetation Index）from the image of FORMOSA-2 to calibrate and increase the spatial resolution of the LST map at the micro-level. Finally, overlaying GIS social-economic data such as land-use type, density of population, the ratio of architectures and green cover ratio with LST, aims at examining how social-economic parameters influenced the distribution of surface temperature in urban scale.
During daytime in summer, we have the highest average temperature 36.52℃ in commercial district. Furthermore, in our UHI model we found the Ratio of Road and Architecture are the most significant variables affecting LST and the Ratio of Green cover is the only variable that can mitigate UHI effect. Comparing with the elastic of the Ratio of Green cover over Road and Architecture, we can realize that when
increasing one area-unit of architecture or road in a village, we must also increase about 0.6 area-unit of green cover to cool down the surface temperature. With overlaying technique, we find that the ratio of Green on park and Greenland in Tainan is 45% and 41%, which unqualified to the minimum ratio of green in “Urban Design Review Panel of Tainan”. According to the results above, we can provide suggestions for government to cool down the local highest temperature region by improving the ratio of green cover and create a more sustainable environment.
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