Study on the thermal environment effect of land use type and pattern changes:Harbin city

Normalizing land surface temperature to eliminate its uncomparableness due to the images acquired in different times,calculating the proportion of land use types in 2km×2km case as a token of the land use pattern,and take Harbin city as an example to study the spatial pattern and the rule of spatial-temporal changes of urban heat field distribution,and uncover the effects of land use types spatial pattern on the urban thermal environment.The results show that: Heat-island effect existed remarkably in the built up area of Harbin,and was swelled;the collectivity land surface temperature of Harbin city ascended.The mean values' discrepancy of each land use of different types of land surface temperature decreased;the function of build up area to heat-island effect boosted up;water' s function of reducing heat-island effect weakened;spatial discrepancy of thermal environment became unconspicuous.