基于Landsat 5热红外波段反演亮度温度的比较研究

Comparisons of brightness temperature inversed from thermal infrared band of Landsat 5

为地表温度的反演提供理论依据,比较Landsat方式与Planck函数法反演地表亮度温度差异,以玛多地区的Lndsat 5 TM热红外波段为例,计算了亮度温度及其差值。结果表明:两种反演方法得出的结果非常接近,平均值仅相差0.617 K;根据Planck函数法与Landsat方式亮度温度数据直方图,两者频率最高区几乎一样,空间差异不太明显;Landsat方式与Planck函数法差值的标准差为0.007 350;与地表温度实测值相比较,差值分别为4.2℃和4.9℃,与实测值相差较多,因此,两者都比较适合常规下地表温度的反演,但不适合作地表温度使用。

To provide theoretical basis for the inversion of land surface temperature, we took the thermal infrared band of Landsat - 5 TM of Maduo, Qinghai, as an example to compare the inversion difference of the Landsat and Planck function, and calculated brightness temperature and difference. The results show that the inversion results of two methods are very closed, and the average difference in only 0. 617 K. The highest frequency areas of the two methods are almost same and the space difference is not obvious. The difference standard deviation of Landsat way and the Planck function is 0. 007 350. Compared to the measured land surface temperature, the difference is 4. 2 ℃ and 4. 9 ℃ respectively, higher than actually measured values. The two methods are suitable for the normal surface temperature inversion, but not for actual surface temperature use.