Please use this identifier to cite or link to this item: http://hdl.handle.net/10662/21827
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dc.contributor.authorObregón Muñoz, María Ángeles-
dc.contributor.authorRodrigues, Gonzalo-
dc.contributor.authorCosta, Maria Joao-
dc.contributor.authorPotes, Miguel-
dc.date.accessioned2024-07-09T17:51:28Z-
dc.date.available2024-07-09T17:51:28Z-
dc.date.issued2019-
dc.identifier.issn2072-4292-
dc.identifier.urihttp://hdl.handle.net/10662/21827-
dc.descriptionThe following are available online at http://www.mdpi.com/2072-4292/11/14/1649/s1, Table S1: List of the 94 AERONET stations used in the validation. Columns indicate the designation, longitude, latitude, altitude and number of data.es_ES
dc.description.abstractThis study presents a validation of aerosol optical thickness (AOT) and integrated water vapour (IWV) products provided by the European Space Agency (ESA) from multi-spectral imager (MSI) measurements on board the Sentinel-2 satellite (ESA-L2A). For that purpose, data from 94 Aerosol Robotic Network (AERONET) stations over Europe and adjacent regions, covering a wide geographical region with a variety of climate and environmental conditions and during the period between March 2017 and December 2018 have been used. The comparison between ESA-L2A and AERONET shows a better agreement for IWV than the AOT, with normalized root mean square errors (NRMSE) of 5.33% and 9.04%, respectively. This conclusion is also reflected in the values of R 2 , which are 0.99 and 0.65 for IWV and AOT, respectively. The study period was divided into two sub-periods, before and after 15 January 2018, when the Sentinel-2A spectral response functions of bands 1 and 2 (centered at 443 and 492 nm) were updated by ESA, in order to investigate if the lack of agreement in the AOT values was connected to the use of incorrect spectral response functions. The comparison of ESA-L2A AOT with AERONET measurements showed a better agreement for the second sub-period, with root mean square error (RMSE) values of 0.08 in comparison with 0.14 in the first sub-period. This same conclusion was attained considering mean bias error (MBE) values that decreased from 0.09 to 0.01. The ESA-L2A AOT values estimated with the new spectral response functions were closer to the correspondent reference AERONET values than the ones obtained using the previous spectral response functions. IWV was not affected by this change since the retrieval algorithm does not use bands 1 and 2 of Sentinel-2. Additionally, an analysis of potential uncertainty sources to several factors affecting the AOT comparison is presented and recommendations regarding the use of ESA-L2A AOT dataset are given.es_ES
dc.description.sponsorshipThis work was partially supported by FCT (Fundação para a Ciência e a Tecnologia) through the grants SFRH/BPD/86498/2012 and SFRH/BSAB/143164/2019 with national funding. The work is co-funded by the European Union through the European Regional Development Fund, included in the COMPETE 2020 (Operational Program Competitiveness and Internationalization) through the ICT project (UID/GEO/04683/2013) with the reference POCI-01-0145- FEDER-007690 and also through ALOP (ALT20-03-0145-FEDER- 000004), DNI-A (ALT20-03-0145-FEDER-000011), TOMAQAPA (PTDC/CTAMET/29678/2017) projects, and in the framework of the Interreg V A Spain - Portugal program (POCTEP) through the CILIFO project (Ref: 0753_CILIFO_5_E).es_ES
dc.format.extent15 p.es_ES
dc.format.mimetypeapplication/pdfen_US
dc.language.isoenges_ES
dc.publisherMDPIes_ES
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectValidationes_ES
dc.subjectValidaciónes_ES
dc.subjectSentinel-2es_ES
dc.subjectSentinel-2es_ES
dc.subjectAeronetes_ES
dc.subjectAeronetes_ES
dc.titleValidation of ESA Sentinel-2 L2A Aerosol Optical Thickness and Columnar Water Vapour during 2017–2018es_ES
dc.typearticlees_ES
dc.description.versionpeerReviewedes_ES
europeana.typeTEXTen_US
dc.rights.accessRightsopenAccesses_ES
dc.subject.unesco22 Físicaes_ES
europeana.dataProviderUniversidad de Extremadura. Españaes_ES
dc.identifier.bibliographicCitationObregón M.Á., Rodrigues G., Costa M.J., Potes M., Silva A.M. Validation of ESA Sentinel-2 L2A aerosol optical thickness and columnar water vapour during 2017-2018 (2019) Remote Sensing, 11 (14), art. no. 1649 DOI: 10.3390/rs11141649 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85071531676&doi=10.3390%2frs11141649&partnerID=40&md5=1eb7d2e8a1a2d7dce2a60d4bb42c2047es_ES
dc.type.versionpublishedVersiones_ES
dc.contributor.affiliationN/Aes_ES
dc.contributor.affiliationUniversidad de Extremadura. Departamento de Físicaes_ES
dc.relation.publisherversionhttps://www.mdpi.com/2072-4292/11/14/1649es_ES
dc.identifier.doi10.3390/rs11141649-
dc.identifier.publicationtitleRemote Sensinges_ES
dc.identifier.publicationissue14es_ES
dc.identifier.publicationfirstpage1-1649es_ES
dc.identifier.publicationlastpage15-1649es_ES
dc.identifier.publicationvolume11es_ES
dc.identifier.orcid0000-0002-4645-5014es_ES
dc.identifier.orcid0000-0003-2981-2232es_ES
dc.identifier.orcid0000-0002-8912-5277es_ES
dc.identifier.orcid0000-0003-2002-4774es_ES
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