利用ASTER数据反演南京城市地表温度

Land Surface Temperature of Nanjing Retrieved from ASTER Data

利用针对ASTER数据的分裂窗算法,反演了南京城市地表温度,并用实际观测资料和同步的MODIS数据对反演结果进行了验证,结果表明：基于ASTER数据的地表温度反演结果与实际观测资料相差0.9℃,与MODIS数据的反演结果具有较好的空间一致性;基于ASTER数据反演的当日南京地表温度在23～56℃范围内,城市地表温度普遍高于35℃,市内公园地表温度略低,多位于30～35℃,长江水体温度低于30℃,地表温度存在明显的空间差异;南京城市夏季白天存在明显＂热岛效应＂,热岛强度的空间差异与南京城市发展、规划有关。

Land surface temperature （LST） of Nanjing was retrieved from the Advanced Spacebome Thermal and Emission and Reflection Radio meter（ASTER） data at 1030 BST 21 August 2002 with the split-window algorithm, and the retrieved results are compared with that from the synchronous MODIS data and the observations. Results show that： （ 1 ） The LST derived from ASTER is 0.9 ℃ higher than the observation, and its spatial distribution pattern is well consistent with that from the MODIS data; （2） On 21 August 2002 ,the retrieval LST from ASTER data is between 23 ℃ to 56 ℃ in Nanjing,and there are marked spatial differences in LSTs over different land surfaces;the LST of city is generally higher than 35 ℃ and little lower between 30℃to 35 ℃ in the parks,but for Yangtze river water body it is lower than 30 ℃; （3） The urban heat island （UHI） effect is obvious in summer daytime in Nanjing, and the spatial distribution of UHI intensity is related to the development and planning of the city.