基于天宫二号数据的北京市地表温度反演研究

Study on Land Surface Temperature Retrieval in Beijing Based on Tiangong-2 Data

针对新型国产遥感数据源天宫二号宽波段数据的波段特点,在传统劈窗算法的基础上推导出适用于天宫二号宽波段数据的地表温度反演算法参数,对北京市地表温度进行反演,并采用MODIS地表温度产品进行交叉验证。在此基础上,结合北京市不同土地利用类型图对地表温度情况进行分析。结果表明:天宫二号宽波段数据的波段设置满足地表温度反演的参数需求;利用天宫二号数据反演的地表温度与MODIS地表温度产品具有较好的一致性,相关系数为0.79,均方根误差为1.28 K;研究区不同土地利用类型地表温度存在差异,其中建设用地温度最高,水域最低。

Tiangong-2(TG-2)wide band data is a new remote sensing data source of China.According to its band feature,an algorithm parameter suitable for Land Surface Temperature(LST)retrieval in Beijing with TG-2 wide band data was proposed based on the traditional split window algorithm.The LST in Beijing was retrieved and the results were compared with MODIS LST products.Then the LST was analyzed according to the map of different land use types in Beijing.The results showed that the band setting of TG-2 wide band data could meet the needs of LST retrieval.The LST results retrieved by TG-2 data were in good agreement with MODIS LST products,the correlation coefficient was 0.79 and the root mean square error(RMSE)was 1.28 K.The LST varied for different land use types and the highest was construction land and the lowest was water.