Spatial-temporal Analysis of the Urban Heat Land Based on TM Remote Image-A Case Study of Ningbo City

With the rapid expansion of the city, the Urban Heat Island effect has caused widespread concern, and has become the hot issue of the climate, ecology, and environmental field. This study taking Ningbo City as the study area, retrieving land surface temperature from Landsat TM remote image based on remote sensing image, quantitatively analyzes of the characters of spatial temporal analysis of the Urban Heat Island in recent 20 years, the research shows that: The high-temperature areas are mainly distributed in the construction urban area, the low-temperature areas are distributed in the suburb, water and vegetation cover area. There is significant gap between highest temperature and lowest temperature, and the high temperature area expanding increasingly, the medium temperature area are reducing, the effect of urban heat island is obvious and the intensity increases; The change of medium temperature area is largest, secondly is high temperature area, the last is low temperature area.