An Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images

Images based on RGB pixel values were used to measure the extinction coefficient of aerosols suspended in an atmospheric state. The pixel values of the object-image depend on the target-object reflection ratio, reflection direction, object type, distances, illumination intensity, atmospheric particl...

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Autores principales:	Dukhyeon Kim, Youngmin Noh
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	extinction coefficients ångström exponent camera-rgb aerosol effective wavelength PM<sub>2.5</sub> Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/eeee74d278354ab28a0b9483a65cd614
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id	oai:doaj.org-article:eeee74d278354ab28a0b9483a65cd614
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spelling	oai:doaj.org-article:eeee74d278354ab28a0b9483a65cd6142021-11-11T19:14:13ZAn Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images10.3390/s212172821424-8220https://doaj.org/article/eeee74d278354ab28a0b9483a65cd6142021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7282https://doaj.org/toc/1424-8220Images based on RGB pixel values were used to measure the extinction coefficient of aerosols suspended in an atmospheric state. The pixel values of the object-image depend on the target-object reflection ratio, reflection direction, object type, distances, illumination intensity, atmospheric particle extinction coefficient, and scattering angle between the sun and the optical axes of the camera, among others. Therefore, the imaged intensity cannot directly provide information on the aerosol concentration or aerosol extinction coefficient. This study proposes simple methods to solve this problem, which yield reasonable extinction coefficients at the three effective RGB wavelengths. Aerosol size information was analogized using the RGB Ångström exponent measured at the three wavelengths for clean, dusty, rainy, Asian dust storm, and foggy days. Additionally, long-term measurements over four months showed reasonable values compared with existing PM<sub>2.5</sub> measurements and the proposed method yields useful results.Dukhyeon KimYoungmin NohMDPI AGarticleextinction coefficientsångström exponentcamera-rgbaerosoleffective wavelengthPM<sub>2.5</sub>Chemical technologyTP1-1185ENSensors, Vol 21, Iss 7282, p 7282 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	extinction coefficients ångström exponent camera-rgb aerosol effective wavelength PM<sub>2.5</sub> Chemical technology TP1-1185
spellingShingle	extinction coefficients ångström exponent camera-rgb aerosol effective wavelength PM<sub>2.5</sub> Chemical technology TP1-1185 Dukhyeon Kim Youngmin Noh An Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images
description	Images based on RGB pixel values were used to measure the extinction coefficient of aerosols suspended in an atmospheric state. The pixel values of the object-image depend on the target-object reflection ratio, reflection direction, object type, distances, illumination intensity, atmospheric particle extinction coefficient, and scattering angle between the sun and the optical axes of the camera, among others. Therefore, the imaged intensity cannot directly provide information on the aerosol concentration or aerosol extinction coefficient. This study proposes simple methods to solve this problem, which yield reasonable extinction coefficients at the three effective RGB wavelengths. Aerosol size information was analogized using the RGB Ångström exponent measured at the three wavelengths for clean, dusty, rainy, Asian dust storm, and foggy days. Additionally, long-term measurements over four months showed reasonable values compared with existing PM<sub>2.5</sub> measurements and the proposed method yields useful results.
format	article
author	Dukhyeon Kim Youngmin Noh
author_facet	Dukhyeon Kim Youngmin Noh
author_sort	Dukhyeon Kim
title	An Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images
title_short	An Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images
title_full	An Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images
title_fullStr	An Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images
title_full_unstemmed	An Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images
title_sort	aerosol extinction coefficient retrieval method and characteristics analysis of landscape images
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/eeee74d278354ab28a0b9483a65cd614
work_keys_str_mv	AT dukhyeonkim anaerosolextinctioncoefficientretrievalmethodandcharacteristicsanalysisoflandscapeimages AT youngminnoh anaerosolextinctioncoefficientretrievalmethodandcharacteristicsanalysisoflandscapeimages AT dukhyeonkim aerosolextinctioncoefficientretrievalmethodandcharacteristicsanalysisoflandscapeimages AT youngminnoh aerosolextinctioncoefficientretrievalmethodandcharacteristicsanalysisoflandscapeimages
_version_	1718431620151640064

An Aerosol Extinction Coefficient Retrieval Method and Characteristics Analysis of Landscape Images

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