摘要
从理论上分析与模拟了基于Landsat TM热红外波段反演地表温度的单窗算法和普适性单通道算法关于大气参数(Latm↓、Lλatm↑与τ)近似估计差异及其对地表温度反演影响。当大气剖面水汽总含量较小时,两算法对三参数的估值较为接近;但随w增大普适性单通道算法则高估Latm↓和Lλatm↑,而对τ却低估。结果导致除在大气平均温度和大气剖面水汽总含量均较低时两种算法反演结果较为接近外,而在其他条件下普适单通道算法反演结果偏高。经分析,普适性单通道算法并不具有普适性,在高T0和/或高w条件下,其偏离地表真实温度的可能性较大,应慎用。
The atmospheric parameters the downwelling atmospheric radiance （L^atm↓）, the upwelling atmospheric radiance （Lλ^atm↑）, and the total atmospheric transmissivity （τ） between the surface and the sensor, can be approximately estimated by the mono-window algorithm and the generalized single-channel method. The differences between three atmospheric parameters in two algorithms were analyzed and simulated. The results indicated that the generalized single-channel method overestimated L^atm↓ and Lλ^atm↑and underestimated r when the total atmospheric water vapor content （ω） is high. This made the former retrieve higher land surface temperature except that both the total atmospheric water vapor content （ω） and the mean atmospheric temperature are low. Further analysis shows that the generalized single-channel method is not really generally prevalent and that it is not suitable for the circumstances of high total atmospheric water vapor content （ω） and/or high mean atmospheric temperature.
出处
《遥感信息》
CSCD
2009年第1期36-40,48,共6页
Remote Sensing Information
基金
山东省科学院科技发展基金(科基合字2005第16号)
