SURVEY OF EMISSIVITY VARIABILITY IN THERMOGRAPHY OF URBAN AREAS
SURVEY OF EMISSIVITY VARIABILITY IN THERMOGRAPHY OF URBAN AREAS
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DOI：
10.1016/0034-4257(82)90043-8
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发表时间：
1982-01-01
影响因子：
13.5
通讯作者：
CARNAHAN, WH
中科院分区：
文献类型：
--
作者：
ARTIS, DA;CARNAHAN, WH
本研究旨在探讨屋顶辐射率变化对航空热像影像之影响。热谱图已被用于检测住宅屋顶的热损失。然而，屋顶之间的温度变化可能导致热谱图图像中映射的温度的错误表示。这项研究的目的是：（a）证明利用遥感数据计算地表发射率的技术的可行性;（B）应用这一技术，确定城市地表发射率变化的程度。在实验方法的第一部分中，开发了一种被动技术来从两个波段的热红外辐射数据计算发射率。固有的局限性和来源的错误与技术进行了讨论。在实验方法的第二部分中，该技术被用来测量印第安纳州特雷霍特市范围内的1411个屋顶的发射率。这项调查的结果表明，超过98%的被调查屋顶的发射率范围非常窄。它的结论是，所观察到的屋顶发射率的变化有一个最小的影响，在热谱图中描绘的温度。
This study investigates the effects of roof emissivity variation of aerial thermogram images. Thermograms have been used to detect heat loss from residential roofs. Emissivity variation among rooftops, however, can lead to a misrepresentation of the temperatures mapped in a thermogram image. The objectives of this study were (a) to demonstrate the feasibility of a technique to use remotely sensed data to calculate surface emissivities and (b) to apply that technique, to determine the extent of emissivity variation in urban surfaces. In the first part of the experimental approach a passive technique is developed to calculate emissivity from two-band thermal infrared radiance data. Inherent limitations and sources of error associated with the technique are discussed. In the second part of the experimental approach the technique was used to measure the emissivity of 1411 roofs within the city limits of Terre Haute, Indiana. Results of this survey indicated that over 98% of the roofs surveyed were confined to a very narrow range of emissivities. It is concluded that the observed variation in rooftop emissivities has a minimal effect on the temperatures depicted in thermograms.