Temporal and Spatial Analysis of Urban Heat Island in Changsha Based on Remote Sensing Data

In this paper,the land surface temperature is retrieved and helped to calculate the multi-temporal heat island intensity based on Landsat TM/ETM+ data in Changsha city.The results show that the extent of UHI and the built-up area in Changsha city are consistent.The new area of UHI grows rapidly with the development of urban construction,new development zones and road transport network mainly in the east-south direction.The heat island area and normal area are distinguished according to the heat island intensity.The heat island area has extended from 13.18km2 in 1993 to 68.16km2 in the year 2008.At last,the development trend of heat island in Changsha city is predicted.