都市化是建成環境取代天然土地的過程，並促使都市氣候的形成，由於人類的經濟活動以及人為建設產生並蓄積過多熱能，致使都市地區相對於其周邊地區猶如一座發熱的島嶼，被寒冷的海洋包圍，稱之為都市熱島(Urban Heat Island, UHI)。都市熱島現象的普遍定義為都市地區的溫度高於其周邊地區，常見以都市地區與鄉村地區之溫度差異(∆T_(u-r))來量測都市熱島強度(Urban Heat Island Intensity, UHII)。都市中承載過多的熱能使熱平衡被破壞，包括人工材質吸收較多太陽輻射熱能，再加上通勤、冷暖氣所排放的廢熱；此外，都市內可能因為量體的排列影響都市風的流動，形成了形成都市微氣候(micro climate)，使其溫度有別於其周邊地區。因此，在都市與鄉村地區之間，還有都市內部，都存在溫度的差異，換言之，都市熱島現象存在全區效應與地區效應。近年來，出現各項研究分析都市熱島的空間特性與熱島影響因子之關係(Guo et al., 2015; Majumdar & Biswas, 2016)。然而，目前較少研究討論到都市地區內部紋理差異與熱島的空間特性之關係，所以本研究擬從熱島的空間特性去探討都市紋理的特徵與差異，進一步釐清都市熱島和都市紋理的關係。
本研究以台中市為實證地區，原台中市地區為其都市地區，將都市的建物數值地形圖建立為150 m之紋理格網，並透過Spacemate多密度指標將紋理分為九種建物類型，另選用ASTER之日間與夜間的地表溫度資料以分析日夜之都市熱島現象。研究成果顯示日間的熱島效應影響比夜間強，而且在局部地區又有極強的熱島效應，日間都市地區較鄉村地區高約4℃、夜間高約2℃，另外，都市地區內的H-H地區之UHII平均值日間比夜間高1.75℃。再者，Kriging及Contour分析得知日間UHII≥3與夜間UHII≥2有明顯的高值聚集，而且日間在多處有局部極高的UHII出現。
此外，研究成果也顯示都市地區外圍屬於非熱島地區，包括北、西及南屯區，較不受熱島效應影響並且為低強度且低緊湊度之紋理，以低強度單一建物(0≤L<3且0≤GSI<0.15)為主，在日間約佔六成、夜間七成；而市區中心及其周邊地區，主要分布在中、西、北區及其鄰近地帶，受到熱島效應影響，還有受到熱島效應影響又更大的局部地區，錯落在熱島地區範圍內，皆為較高強度且高緊湊度之紋理，以中強度街廓建物(3≤L<7且GSI≥0.25)為主，前者日夜間該建物皆約佔三成五，後者日間約佔四成、夜間佔三成。同時，Spacemate分析圖中顯示紋理特性與熱島強度的互動關係：大多數情況下都表現了隨UHII較高，而GSI、FSI和L上升、OSR下降，換言之局部高溫地區、熱島地區和非熱島地區的紋理特性之緊湊度和開發強度，是由緊湊/強至零散/弱。只是，在各個熱島特性地區中仍都有例外者，推測這些地區受到紋理以外的因素影響，使其熱島效應比類似的紋理更高或更低。

In recent years, more and more research studied the relationship between the spatial pattern of Urban Heat Island (UHI) and its factors, however, there are still fewer discussions about the differences between the urban fabrics and their relationships with UHI. This study chooses Taichung City as the study area. The buildings in the city have been converted into a grid with a resolution of 150 m, and then divided into 9 building types through multiple density indicators. Besides, ASTER images are used to draw the UHI intensity (UHII) map. LISA is a method to identify UHII clusters.
The results show that the intensity of UHI during daytime is stronger than nighttime and the temperature in some areas is extremely high. Non-heat island areas that are located outside the urban area are not affected by UHI, on the other hand, urban area and its surrounding areas are impacted by UHI, and some of which are greatly affected. Finally, through the Spacemate plane, we see the interaction between the urban fabric and the UHI phenomenon, which shows that as the degree of UHII increases, GSI, FSI, and L increase, while OSR decreases. This applies to non-heat island areas mainly composed of low-rise point buildings, as well as heat islands and higher temperature areas mainly composed of mid-rise block buildings, whether day or night. They all follow this rule: from local high-temperature areas to heat island areas, and then to non-heat island areas, the urban fabric changes from highly developed and highly intensive to low development and less intensive.

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