Study on Urban Hot Island Effect and Application Based on TM Data

In this paper,state,surface temperature,surface reflectivity,as well as the normalized difference vegetation index were gained by quantitative data on the use of multi-inversion of the TM of Xuchang City,the relationship between the spatial distribution of surface temperature and surface temperature distribution and surface reflectivity,normalized difference vegetation index quantitative was analyzed.It is found that the scale of urbanization and urban heat island are positively related to urban heat island and green space,green space distribution,the composition of green space,as well as bloom was negatively correlated;the old town with low vegetation cover,urban structure is concentrated,the slowly moving air flow is an important reason responsible for urban heat island.The hot island effect is significant in Zhengxu due to promoting the area as factories and enterprises which cause the more significant warming phenomenon,residential area is vigorously developing in Dongcheng District,at the same time attention is paid to building green area,warming phenomenon is not obvious,urban ecological environment is better in this district.Therefore,in future urban planning and construction,the old city area,and Zhengxu development planning and construction should learn from the experience of planning and construction of Dongcheng District to strengthen the construction of urban green space,improve vegetation coverage,pay attention to the level of the distribution of urban architecture,urban air reserve circulation zone,improve the air flow velocity,and help alleviating the urban hot island effect.For the improvement of urban ecological environmental quality,the urban living environment should enhance the evaluation of Xuchang City's comprehensive competitiveness,the role can not be underestimated.