Analysis on the effect of land use changes on urban heat island in Wuhan based on remote sensing

Urban heat island effect is closely related to urbanization and land use changes.The expansion of urban impervious surface has greatly changed the thermodynamic properties of the underlying surface,which is a major cause of urban heat island effect.The authors obtained the land use data in Wuhan city in 2002 and 2012from Landsat 7ETM+and HJ-1Asatellite multispectral remote sensing through artificial interpretation,and graded the urban heat island intensity by using the land surface temperature product obtained from MODIS,then analyzed the temporal-spatial change of urban heat island and land use changes and revealed their relationship.The results indicate that:1)the urban heat island effect in Wuhan city is of medium and high intensity,with its intensity highest in the downtown areas and declining to the periphery of each district and showing a tendency of connecting together,showing the same expansion pattern with urban areas;2)generally,urban heat island in Wuhan city is intensified by the expansion of urban construction land.