A retrieval method for land surface temperatures based on UAV broadband thermal infrared images via the three-dimensional look-up table

Zhong Xue; Zhao Lihua; Wang JieZhang XiangNie ZichuanLi YingtanRen Peng

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A retrieval method for land surface temperatures based on UAV broadband thermal infrared images via the three-dimensional look-up table

机译：A retrieval method for land surface temperatures based on UAV broadband thermal infrared images via the three-dimensional look-up table

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摘要

Land surface temperatures (LSTs) represent a crucial parameter to characterize the urban thermal environment. Although numerous methods have been proposed to retrieve LSTs based on data from satellites or unmanned aerial vehicles (UAVs), challenges remain for acquiring precise pixel-level LSTs of highly heterogeneous urban surfaces on the micro scale. This study proposed a method of temperature retrieval for UAV-derived broadband thermal infrared images via a three-dimensional look-up table (TRUB-3DLUT) to retrieve LSTs of complicated urban surfaces. Based on radiative transfer between surfaces and the atmosphere, the method comprehensively quantified the impacts of radiation emitted by surfaces, wavelength, land surface emissivity (LSE) and atmo-spheric parameters on the retrieved LSTs. Then, the 3DLUT was directly used to generate the urban low-altitude atmospheric products and retrieve the LSTs via the UAV-derived images with a high-spatial resolution. Valida-tions demonstrated that the retrieved LSTs were well-aligned with the in-situ LSTs and that the absolute dif-ferences were less than 1.5 K for sunlit surfaces with higher emissivity. The TRUB-3DLUT offered practical utility in reducing the uncertainty of the inputs in the radiative transfer equation and thus improving the accuracy of the retrieved LSTs. Therefore, such a method is envisioned as an effective tool for quantitatively analyzing the spatial variations of urban thermal environments on the micro scale.

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来源
《Building and environment》 |2022年第12期|1-15|共15页
作者
Zhong Xue; Zhao Lihua; Wang JieZhang XiangNie ZichuanLi YingtanRen Peng;
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作者单位

South China Univ Technol;

China West Normal Univ;

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原文格式 PDF
正文语种英语
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关键词
Land surface temperatures (LSTs); Unmanned aerial vehicles (UAVs); Three-dimensional look-up table (3DLUT); Broadband thermal imager; Radiative transfer equation (RTE);

A retrieval method for land surface temperatures based on UAV broadband thermal infrared images via the three-dimensional look-up table

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