Study on the analysis of the cause of an Urban heat Island phenomenon through reproducing the past condition

In this study, we created a past thermal environment-related database around Kinki region and reproduced and evaluated past urban thermal environment. Comparing that calculation result with statistics, observed value or present situation calculation result established accuracy of reproduction. In addition, about land use and anthropogenic waste heat data as sources to affect urban thermal environment, we calculated with only one factor past to identify effective factor on temperature rise from past to present in an axis of time and space. Land use totally makes an impact, in urban areas, most affective sectors are transportation at daytime and residential and commercial at night.