A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements

Identification of clouds from satellite images is now a routine task. Observation of clouds from the ground, however, is still needed to acquire a complete description of cloud conditions. Among the standard meteorologicalvariables, solar radiation is the most affected by cloud cover. In this note,...

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Detalhes bibliográficos
Autores: Calbó Angrill, Josep, González Gutiérrez, Josep Abel, Pagès, David
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2001
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:10256/7693
Acesso em linha:http://hdl.handle.net/10256/7693
Access Level:acceso abierto
Palavra-chave:Radiació solar
Núvols
Clouds
Meteorologia -- Observacions
Meteorology -- Observations
Sun -- Radiation
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spelling A Method for Sky-Condition Classification from Ground-Based Solar Radiation MeasurementsCalbó Angrill, JosepGonzález Gutiérrez, Josep AbelPagès, DavidRadiació solarNúvolsCloudsMeteorologia -- ObservacionsMeteorology -- ObservationsSun -- RadiationIdentification of clouds from satellite images is now a routine task. Observation of clouds from the ground, however, is still needed to acquire a complete description of cloud conditions. Among the standard meteorologicalvariables, solar radiation is the most affected by cloud cover. In this note, a method for using global and diffuse solar radiation data to classify sky conditions into several classes is suggested. A classical maximum-likelihood method is applied for clustering data. The method is applied to a series of four years of solar radiation data and human cloud observations at a site in Catalonia, Spain. With these data, the accuracy of the solar radiation method as compared with human observations is 45% when nine classes of sky conditions are to be distinguished, and it grows significantly to almost 60% when samples are classified in only five different classes. Most errors are explained by limitations in the database; therefore, further work is under way with a more suitable databaseAmerican Meteorological Society2001info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10256/7693http://hdl.handle.net/10256/7693© Journal of Applied Meteorology and Climatology, 2001, vol. 40, núm. 12, p. 2193-2199Articles publicats (D-F)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)Inglésinfo:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0450(2001)040<2193:AMFSCC>2.0.CO;2info:eu-repo/semantics/altIdentifier/issn/1558-8432info:eu-repo/semantics/altIdentifier/eissn/1558-8424Tots els drets reservatsinfo:eu-repo/semantics/openAccessoai:recercat.cat:10256/76932026-05-29T05:05:01Z
dc.title.none.fl_str_mv A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements
title A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements
spellingShingle A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements
Calbó Angrill, Josep
Radiació solar
Núvols
Clouds
Meteorologia -- Observacions
Meteorology -- Observations
Sun -- Radiation
title_short A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements
title_full A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements
title_fullStr A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements
title_full_unstemmed A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements
title_sort A Method for Sky-Condition Classification from Ground-Based Solar Radiation Measurements
dc.creator.none.fl_str_mv Calbó Angrill, Josep
González Gutiérrez, Josep Abel
Pagès, David
author Calbó Angrill, Josep
author_facet Calbó Angrill, Josep
González Gutiérrez, Josep Abel
Pagès, David
author_role author
author2 González Gutiérrez, Josep Abel
Pagès, David
author2_role author
author
dc.subject.none.fl_str_mv Radiació solar
Núvols
Clouds
Meteorologia -- Observacions
Meteorology -- Observations
Sun -- Radiation
topic Radiació solar
Núvols
Clouds
Meteorologia -- Observacions
Meteorology -- Observations
Sun -- Radiation
description Identification of clouds from satellite images is now a routine task. Observation of clouds from the ground, however, is still needed to acquire a complete description of cloud conditions. Among the standard meteorologicalvariables, solar radiation is the most affected by cloud cover. In this note, a method for using global and diffuse solar radiation data to classify sky conditions into several classes is suggested. A classical maximum-likelihood method is applied for clustering data. The method is applied to a series of four years of solar radiation data and human cloud observations at a site in Catalonia, Spain. With these data, the accuracy of the solar radiation method as compared with human observations is 45% when nine classes of sky conditions are to be distinguished, and it grows significantly to almost 60% when samples are classified in only five different classes. Most errors are explained by limitations in the database; therefore, further work is under way with a more suitable database
publishDate 2001
dc.date.none.fl_str_mv 2001
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10256/7693
http://hdl.handle.net/10256/7693
url http://hdl.handle.net/10256/7693
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0450(2001)040<2193:AMFSCC>2.0.CO;2
info:eu-repo/semantics/altIdentifier/issn/1558-8432
info:eu-repo/semantics/altIdentifier/eissn/1558-8424
dc.rights.none.fl_str_mv Tots els drets reservats
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Tots els drets reservats
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Meteorological Society
publisher.none.fl_str_mv American Meteorological Society
dc.source.none.fl_str_mv © Journal of Applied Meteorology and Climatology, 2001, vol. 40, núm. 12, p. 2193-2199
Articles publicats (D-F)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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