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Remote estimation of complete urban surface temperature using only directional radiometric temperatures

机译：仅使用定向辐射温度即可远程估算整个城市地表温度

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摘要

Complete urban surface temperature (T-c) is a key variable for quantifying the urban surface - atmosphere interactions. The estimation of T-c usually requires detailed knowledge of surface geometry and facet temperatures, which are difficult to obtain by remote sensing. Therefore, simple but efficient strategies for the remote estimation of T-c are currently lacking. Facing this challenge, we proposed a comprehensive solution to estimate T-c remotely using only the directional radiometric temperatures (DRTs) without the assistance of ground-based information. By comparing T-c with the nadir temperature (T-0), DRTs within the entire hemisphere, and solid angle integral temperature (SIT), we obtain the following results: (1) The optimal viewing azimuth and zenith angles at which the DRTs are the closest to T-c are phi(s) +/- 90 degrees (phi(s) is the solar azimuth angle) and 45-60 degrees, respectively. (2) The estimation of T-c could be further improved once the DRTs from all-direction are available, and the MAE for the SIT that most closely approximated T-c is only 0.87 K. (3) The MAE of the SIT that best approximates T-c by combining only four DRTs and a kernel-driven model is only slightly higher than that of the specific SIT based on the original DRTs, indicating that the remote estimation of T-c using limited DRTs is plausible. These proposed strategies are generally simple and effective, and can help facilitate the estimation of T-c and therefore help advance the thermal remote sensing of urban climate and environment.
机译：完整的城市地表温度（T-c）是量化城市地表与大气相互作用的关键变量。 T-c的估算通常需要详细了解表面几何形状和刻面温度，而这很难通过遥感获得。因此，目前缺乏用于远程估计T-c的简单而有效的策略。面对这一挑战，我们提出了一种全面的解决方案，无需借助地面信息即可仅使用定向辐射温度（DRT）来远程估算T-c。通过将Tc与最低温度（T-0），整个半球内的DRT和立体角积分温度（SIT）进行比较，我们得到以下结果：（1）DRT处于最佳视角时的最佳观察方位角和天顶角最接近Tc的分别是phi +/- 90度（phi是太阳方位角）和45-60度。 （2）一旦有来自所有方向的DRT，Tc的估计就可以得到进一步的改善，最接近Tc的SIT的MAE仅为0.87K。（3）最接近Tc的SIT的MAE为仅结合四个DRT和一个内核驱动模型的组合仅略高于基于原始DRT的特定SIT的组合，这表明使用有限的DRT进行Tc的远程估算是合理的。这些提出的策略通常是简单有效的，并且可以帮助促进T-c的估算，从而有助于推进城市气候和环境的热遥感。

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  • 来源
    《Building and Environment》 |2018年第5期|224-236|共13页
  • 作者

    Jiang Lu; Zhan Wenfeng; Voogt James; Zhao Limin; Gao Lun; Huang Fan; Cai Zhe; Ju Weimin;

  • 作者单位

    Nanjing Univ, Int Inst Earth Syst Sci, Jiangsu Prov Key Lab Geog Informat Sci & Technol, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Int Inst Earth Syst Sci, Jiangsu Prov Key Lab Geog Informat Sci & Technol, Nanjing 210023, Jiangsu, Peoples R China;

    Univ Western Ontario, Dept Geog, London, ON N6A 5C1, Canada;

    Chinese Acad Sci, Inst Remote Sensing & Digital Earth, Beijing 100101, Peoples R China;

    Nanjing Univ, Int Inst Earth Syst Sci, Jiangsu Prov Key Lab Geog Informat Sci & Technol, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Int Inst Earth Syst Sci, Jiangsu Prov Key Lab Geog Informat Sci & Technol, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Int Inst Earth Syst Sci, Jiangsu Prov Key Lab Geog Informat Sci & Technol, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Int Inst Earth Syst Sci, Jiangsu Prov Key Lab Geog Informat Sci & Technol, Nanjing 210023, Jiangsu, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Urban surface; Land surface temperature; Thermal remote sensing; Complete urban surface temperature; Urban thermal anisotropy; Kernel-driven model;

    机译：城市表面;地表温度;热遥感;完全城市表面温度;城市热各向异性;核驱动模型;

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