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首页> 外文期刊>Physics in Canada >THERMAL INDETERMINATION: THE PROBLEM OF SEPARATION OF EMISSIVITY AND TEMPERATURE
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THERMAL INDETERMINATION: THE PROBLEM OF SEPARATION OF EMISSIVITY AND TEMPERATURE

机译：热测定：发射率和温度的分离问题

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摘要

Land Surface Temperature (LST) and emissivity for large areas can only be derived from surface-leaving infrared radiation measured by remote sensing. But, as the thermal radiation of a surface is the product of its emissivity and temperature, the distinction between both these parameters is not possible if the procedure is solely based on observations of this radiation. We present a review of three recent approaches using thermal infrared data. These methods were developed to solve this indetermination and can be simply applied in the field with a portable multispectral or hyperspec-tral radiometer: (i) the Temperature -Emissivity Separation algorithm (TES-ASTER approach); (ii) the Sun/Shade or dayight approach; (iii) the Spectral Smoothness method, related to the use of hyperspectral data which allows a complete separation of Ts/emissivity on a physical basis. The last two methods require no a priori assumptions on the surface nature, while the TES method assumes that the sample belongs to a type of surface verifying a given spectral contrast relationship. Errors on derived surface temperature when neglecting surface emissivity can be as high as 2° to 3.5 °C.
机译：大面积的陆地表面温度（LST）和发射率只能通过遥感测量的离开表面的红外辐射得出。但是，由于表面的热辐射是其发射率与温度的乘积，因此如果仅基于此辐射的观察过程，则不可能在这两个参数之间进行区分。我们对使用热红外数据的三种最新方法进行了综述。这些方法是为解决这种不确定性而开发的，可以通过便携式多光谱或高光谱辐射计简单地应用于现场：（i）温度-发射率分离算法（TES-ASTER方法）; （ii）太阳/阴影或白天/夜晚的进近; （iii）频谱平滑度方法，与使用高光谱数据有关，该方法可以在物理基础上完全分离Ts /发射率。后两种方法不需要对表面性质进行先验假设，而TES方法则假设样品属于可验证给定光谱对比度关系的表面类型。忽略表面发射率时得出的表面温度误差可能高达2°至3.5°C。

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