基于Landsat8的东莞市热环境变化动态

Study on the Dynamics of Dongguan's Thermal Environment Based on Landsat8

基于2014年和2017年的Landsat8影像,研究利用辐射传输方程反演了东莞市地表温度,并应用景观指数和转移矩阵分析了东莞市2014—2017年热环境的变化动态。结果表明,热强度指数大于0.25或小于等于-0.25的区域定为极温区,符合东莞市实际情况;东莞市相邻热环境区的地表温差从2.94℃减至2.77℃,热岛强度有所减弱;高温区对热环境格局的影响平稳地趋向缩减;各热环境区存在15.7%~29.4%面积变化,其向中温区方向转化的趋势明显。

Based on the Landsat8 images in 2014 and 2017,the land surface temperature in Dongguan was inverted by Radiative Transfer Equation.The dynamics of thermal environment in Dongguan was analyzed by applying Landscape Metrics and Transfer Matrix.The results showed that the area with thermal intensity index greater than 0.25 or less than or equal to-0.25 was defined as the extreme temperature zone,which was in accordance with the actual situation in Dongguan The surface temperature difference of adjacent thermal environment in Dongguan is reduced from 2.94 to 2.77℃,which leaded to fewer heat island effects.Moreover,the effect of high temperature zone on the thermal environment pattern is steadily decreasing There is 15.7%~29.4%area change in each thermal environment zone and the trend of conversion to the middle temperature zone is obviously.