利用环境一号卫星热红外通道反演太湖流域地表温度的3种方法比较

    Three Methods for Inverting Land Surface Temperature of the Taihu Lake Basin Using HJ-1 Satellite Thermal Infrared Channel

    • 摘要: 利用太湖流域2010年3月26日过境的1景环境一号卫星热红外数据(轨道号为451/77),根据同步modis数据反演大气水汽含量参数,分别利用覃志豪单窗算法、普适性单通道算法、基于影像的Artis反演算法反演太湖流域地表温度,通过与同期的MOD11_L2级modis温度产品进行对比分析,探寻适合于环境卫星热红外通道反演地表温度的方法,以达到对环境一号卫星热红外数据定量化应用示范的目的。结果表明:相比其他算法,普适性单通道算法精度较高,与modis温度产品温差较小,为+1.23 K,而环境一号卫星过境时间与modis温度产品时差为39 min,因此该方法的反演精度可以接受。

       

      Abstract: Based on the thermal infrared images of the Taihu Lake Basin taken by the HJ-1 satellite on March 26, 2010, atmospheric moisture content was inverted using the synchronous modis data and land surface temperature (LST) was inverted with mono-window algorithm (Qin, 2001), generalized single-channel algorithm (Jimenez-Munoz & Sobrino, 2003) and image-based Artis inversion algorithm (Artis & Carnahan, 1982), separately for comparison with the temperature product of modis of Grade MOD11_L2, so as to explore suitable method for inversion of surface temperature using the HJ-1 satellite thermal infrared channel. Results show that the generalized single-channel algorithm is more precise than the others and its results differ slightly from the modis temperature product, being 1.23 K on average. Moreover, the overhead time of the satellite is only 39 minutes different from the time of the modis LST product. Therefore, the use of the generalized single-channel algorithm for inversion is acceptable in accuracy.

       

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