Quantitative Analysis of Urban Thermal Environmental Effect Based on ASTER Data

Taking an ASTER data of the study region in Beihai city,as the data source,the moderate resolution transmittance(MODTRAN) radiation model and the spectral response function of ASTER TIR bands have been applied in atmospheric correction,then land surface temperature(LST) were retrieved from five TIR bands by using an integrated algorithm based on the PLANCK function and radioactive transfer equation.The NDVI and the NDWI were calculated from the ASTER VNIR and SWIR bands after atmospheric correction.Compared the LST derived from TIR band with air temperature from observatory,there was an obvious corresponding between the average value of five channels LST and the air temperature.The results demonstrate that LST possessed evidently stronger negative correlation with the NDVI and NDWI.According to the quantitative analysis,the conclusion is that the LST algorithm is effective.