Study on the relationship between surface temperature and land use in Pearl River Delta

With the accelerated process of urbanization,issues of urban climate and environment become more prominent,especially the urban heat island effect.In this paper,we made land use classification by supervised classification method and near-surface air temperature inversion by using Landsat Thematic Mapper(TM) data.Then we analyzed the spatial distribution of urban heat island and its regional differences,as well as the relationship with land use types.It is shown that the temperature of urban construction land is relatively high,which is the main factor for urban heat island while the temperature of vegetation and water is relatively low,which has a significant cooling effect.The heat island intensity profiles show that there are significant differences between north and south in terms of heat island intensity due to vegetation cover and terrain differences while little difference exists between east and west.We also found that the spatial distribution of urban heat island in the research area has the feature of both regional concentrating and scattering.And the heat island has the trend of expanding from the center of regional urban heat island to the suburbs.Besides,there is relatively consistency in terms of spatial distribution between urban heat island and land use types,but also inconsistent area where the urban heat island has expanded to non-urban construction area.