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Article: Calculation of the Angular Radiance Distribution for a Coupled Atmosphere and Canopy

TitleCalculation of the Angular Radiance Distribution for a Coupled Atmosphere and Canopy
Authors
Keywordsatmosphere
bidirectional reflectance distribution function (BRDF)
leaf canopy
radiance
Radiative transfer
Issue Date1993
Citation
IEEE Transactions on Geoscience and Remote Sensing, 1993, v. 31, n. 2, p. 491-502 How to Cite?
AbstractThe radiative transfer equations for a coupled atmosphere and canopy are solved numerically by an improved Gauss-Seidel iteration algorithm. The radiation field is decomposed into three components: unscattered sunlight, single scattering, and multiple scattering radiance for which the corresponding equations and boundary conditions are set up and their analytical or iterational solutions are explicitly derived. The classic Gauss-Seidel algorithm has been widely applied in atmospheric research. This is its first application for calculating the multiple scattering radiance of a coupled atmosphere and canopy. This algorithm enables us to obtain the internal radiation field as well as radiances at boundaries. Any form of bidirectional reflectance distribution function (BRDF) as a boundary condition can be easily incorporated into the iteration procedure. The hotspot effect of the canopy is accommodated by means of the modification of the extinction coefficients of upward single scattering radiation and unscattered sunlight using the formulation of Nilson and Kuusk. To reduce the computation for the case of large optical thickness, an improved iteration formula is derived to speed convergence. The upwelling radiances have been evaluated for different atmospheric conditions, leaf area index (LAI), leaf angle distribution (IAD), leaf size and so on. The formulation presented in this paper is also well suited to analyze the relative magnitude of multiple scattering radiance and single scattering radiance in both the visible and near infrared regions. © 1993 IEEE
Persistent Identifierhttp://hdl.handle.net/10722/321202
ISSN
2023 Impact Factor: 7.5
2023 SCImago Journal Rankings: 2.403
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLiang, Shunlin-
dc.contributor.authorStrahler, Alan H.-
dc.date.accessioned2022-11-03T02:17:19Z-
dc.date.available2022-11-03T02:17:19Z-
dc.date.issued1993-
dc.identifier.citationIEEE Transactions on Geoscience and Remote Sensing, 1993, v. 31, n. 2, p. 491-502-
dc.identifier.issn0196-2892-
dc.identifier.urihttp://hdl.handle.net/10722/321202-
dc.description.abstractThe radiative transfer equations for a coupled atmosphere and canopy are solved numerically by an improved Gauss-Seidel iteration algorithm. The radiation field is decomposed into three components: unscattered sunlight, single scattering, and multiple scattering radiance for which the corresponding equations and boundary conditions are set up and their analytical or iterational solutions are explicitly derived. The classic Gauss-Seidel algorithm has been widely applied in atmospheric research. This is its first application for calculating the multiple scattering radiance of a coupled atmosphere and canopy. This algorithm enables us to obtain the internal radiation field as well as radiances at boundaries. Any form of bidirectional reflectance distribution function (BRDF) as a boundary condition can be easily incorporated into the iteration procedure. The hotspot effect of the canopy is accommodated by means of the modification of the extinction coefficients of upward single scattering radiation and unscattered sunlight using the formulation of Nilson and Kuusk. To reduce the computation for the case of large optical thickness, an improved iteration formula is derived to speed convergence. The upwelling radiances have been evaluated for different atmospheric conditions, leaf area index (LAI), leaf angle distribution (IAD), leaf size and so on. The formulation presented in this paper is also well suited to analyze the relative magnitude of multiple scattering radiance and single scattering radiance in both the visible and near infrared regions. © 1993 IEEE-
dc.languageeng-
dc.relation.ispartofIEEE Transactions on Geoscience and Remote Sensing-
dc.subjectatmosphere-
dc.subjectbidirectional reflectance distribution function (BRDF)-
dc.subjectleaf canopy-
dc.subjectradiance-
dc.subjectRadiative transfer-
dc.titleCalculation of the Angular Radiance Distribution for a Coupled Atmosphere and Canopy-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1109/36.214925-
dc.identifier.scopuseid_2-s2.0-0027558566-
dc.identifier.volume31-
dc.identifier.issue2-
dc.identifier.spage491-
dc.identifier.epage502-
dc.identifier.eissn1558-0644-
dc.identifier.isiWOS:A1993LD28000017-

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