Research On The Heat Island Effect Of Zhengzhou City Based On Landsat

The rapid development of urbanization causes damage to the urban ecological environment,which changes the urban thermal environment,and then causes the urban heat island problem.Zhengzhou city as a very important domestic traffic fortress,in recent years,with the implementation of the policies,as well as the geographical advantage of zhengzhou itself makes the rapid development of zhengzhou,heat island effect significantly,so the analysis and study of zhengzhou city heat island effect,not only help adjustment of zhengzhou's future development direction,and the spatial pattern of zhengzhou planning has important significance.In summary of academic research on heat island effect method and land surface temperature inversion algorithm on the basis of comparative analysis,this study USES a method of combining the quantitative remote sensing and GIS,and combining with the characteristics of the study area,and research data,choose the radiative transfer equation method for zhengzhou city in 2000,2008 and 2017,land surface temperature inversion,and by using transfer matrix probability compared to zhengzhou city from 2000 to 2017 were analyzed spatial and temporal evolution of urban heat island.In addition,this study selected the regulation of soil vegetation index SAVI as zhengzhou information extraction of vegetation index,index MNDWI improved normalized water as the index of water body information extraction,NDBI MNDWI-SAVI(NDBI construction on behalf of the normalized difference index)deputy said building land information extraction index,and in 2017,for example,the surface temperature is analyzed by using 2 d scatter plot and the correlation between the index.The conclusions are as follows:(1)thermal environment mainly the middle district of zhengzhou city,followed by heat island area,heat island area significantly increased from 2000 to 2017,green island and strong green island area is significantly reduced,the evolution of the urban heat island level process: strong green island area to the green area and normal area,heat island area and heat island area,generally for the shift,in turn can also cross level change,but may be smaller,the inverse process,slow down the process of its evolution and urban heat island can not only slow down can also be eliminated.(2)the direction of heat island area is in line with the direction of urban construction land expansion,2000-2017,by the surrounding urban area to the municipal district of dengfeng city of zhengzhou city construction land expansion and xinzheng,and consists of dengfeng city heat island effect,high to construction land intensive municipal districts and xinzheng.(3)There was a positive correlation between surface temperature and savi-mndwi-ndbi,which was negatively correlated with SAVI(soil regulation vegetation index)and MNDWI(improved normalized difference water body index).