2026-05-11T22:52:45Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/54842024-05-14T09:48:44Zcom_10259_4393com_10259_5086com_10259_2604col_10259_4394

Suárez García, Andrés 543 600 Diez Mediavilla, Montserrat 154 500 0000-0002-4957-9530 Granados López, Diego 264 500 0000-0002-9046-7397 González Peña, David 256 500 0000-0002-9347-4947 Alonso Tristán, Cristina 23 500 0000-0003-4733-7391 2020-09-28T07:54:53Z 2020-09-28T07:54:53Z 2020-01 0038-092X http://hdl.handle.net/10259/5484 10.1016/j.solener.2019.11.060 Sky classification is a complex problem, due in part to such abstract conceptual definitions as clear, intermediate, and overcast, as well as other intermediate ranges. The CIE (Commission Internationale de L’Éclairage) Standard classification offers a solution to this problem, although its application requires data on the luminance distribution of the whole sky that are less commonly available. A benchmarking and classification system of ten meteorological indices is introduced in this study to classify the sky types from overcast to clear. The indices can be calculated from measurements of global, diffuse, and direct irradiance that are widely available from meteorological ground stations. The classification system uses confusion matrices, a machine-learning tool that generates a visual display of the results of supervised-learning algorithms. The CIE Standard skies classification, applied to half hourly sky-scanner measurements in Burgos (Spain), over the period June 2016 - May 2017, is used in this study as a baseline reference for a comparative review of the results from the meteorological indices and their results. They are classified by four performance ratings: Accuracy, Jaccard, Cohen, and Matthews, which feature both classification similarity and the randomness of any agreement. All meteorological indices yielded a high average degree of accuracy - close to 80% - in a detailed review of their classification. Neverthless, the results suggested that Perez’s Clearness Index based on global, diffuse and direct radiation measurements offered the most precise classification of the skies, followed closely by the Klucher Clearness Index and the Perraudeau Nebulosity Index. Regional Government of Castilla y León under the “Support Program for Recognized Research Groups of Public Universities of Castilla y León” (ORDEN EDU/667/2019) and the Spanish Ministry of Science, Innovation & Universities under the I + D + i state programme “Challenges Research Projects” (Ref. RTI2018-098900-B-I00) application/pdf eng Elsevier Solar Energy. 2020, V. 195, p. 499-513 https://doi.org/10.1016/j.solener.2019.11.060 info:eu-repo/grantAgreement/JCyL/EDU/667/2019 info:eu-repo/grantAgreement/MICINN/RTI2018-098900-B-I00 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Clearness index Sky classification CIE standard Cloudiness classification Meteorological indices Electrotecnia Electrical engineering Benchmarking of meteorological indices for sky cloudiness classification info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Solar Energy 195 499 513 TEXT Suarez-se_2020.pdf.txt Suarez-se_2020.pdf.txt Extracted text text/plain 75833 https://riubu.ubu.es/bitstream/10259/5484/5/Suarez-se_2020.pdf.txt 45c501ee836afd45f6a172a00a143f30 MD5 5 THUMBNAIL Suarez-se_2020.pdf.jpg Suarez-se_2020.pdf.jpg IM Thumbnail image/jpeg 4456 https://riubu.ubu.es/bitstream/10259/5484/4/Suarez-se_2020.pdf.jpg cf0ee57f6e462af0828d41d605a327eb MD5 4 LICENSE license.txt license.txt text/plain; charset=utf-8 999 https://riubu.ubu.es/bitstream/10259/5484/3/license.txt b295bcbce42e2caabeb0c623d3860c06 MD5 3 CC-LICENSE license_rdf license_rdf application/rdf+xml; charset=utf-8 805 https://riubu.ubu.es/bitstream/10259/5484/2/license_rdf 4460e5956bc1d1639be9ae6146a50347 MD5 2 ORIGINAL Suarez-se_2020.pdf Suarez-se_2020.pdf application/pdf 2886851 https://riubu.ubu.es/bitstream/10259/5484/1/Suarez-se_2020.pdf 23de4bea470a112d7c26d7aca6734129 MD5 1 10259/5484 oai:riubu.ubu.es:10259/5484 2024-05-14 11:48:44.006 Repositorio Institucional de la Universidad de Burgos bubrep@ubu.es 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