利用ASTER数据反演南京城市地表温度

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 of Nanjing Retrieved from ASTER Data

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.