基于Landsat数据的地表温度反演差异及参数分析

Difference and parameter analysis of LST inversion based on Landsat data

只有基于准确的地表温度反演算法计算出的产品数据,才能正确推广使用。研究基于Landsat-8、Landsat-9和气象站数据,对比了5种常用地表温度反演算法的结果,并对不同算法的反演结果和参数灵敏度进行了测试。结果表明:基于地表比辐射率参数计算的辐射传输方程和单通道算法反演结果与地面实测数据吻合较好。基于大气水汽参数计算的单窗算法和劈窗算法的反演结果均高于实测温度。基于平均温度参数计算的单窗算法反演精度误差较大。此外,比较了两种遥感数据在不同地物上反演温度的一致性。研究结果可为地表温度反演和产品选择提供参考。

The correct use of the product is possible only when the land surface temperature(LST)data is calcu⁃lated by an accurate and reliable inversion algorithm.In this paper,we compare the inversion results of five com⁃monly used LST inversion algorithms based on Landsat-8,Landsat-9 data,and weather station data.The inver⁃sion results and parameter sensitivity analysis of different algorithms are tested.The results show that the inver⁃sion results of the Radiative Transfer Equation(RTE)and Single Channel(SC)algorithms calculated based on land surface emissivity(LSE)are in good agreement with the ground measured.The inversion results of the SC algorithm based on the atmospheric water vapor inversion and the Split Window(SW)algorithm based on the at⁃mospheric water vapor inversion are higher than the measured temperature.The inversion accuracy of the Mono Window(MW)algorithm based on average temperature parameters is not ideal.In addition,the consistency of the inversion temperature of the two data on different ground objects is compared.Our study can provide a refer⁃ence for land surface temperature inversion based on Landsat-9 data.