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Validation of Sentinel-3 OLCI integrated water vapor products using regional GNSS measurements in Crete, Greece

Mertikas Stylianos, Partsinevelos Panagiotis, Tripolitsiotis Achilleas, Kokolakis Konstantinos, Petrakis Georgios, Frantzis Xenofon

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URIhttp://purl.tuc.gr/dl/dias/B416EE8B-ECE8-4830-82E4-80B0461A4614-
Identifierhttps://doi.org/10.3390/rs12162606-
Identifierhttps://www.mdpi.com/2072-4292/12/16/2606/htm-
Languageen-
Extent22 pagesen
Extent8,47 megabytesen
TitleValidation of Sentinel-3 OLCI integrated water vapor products using regional GNSS measurements in Crete, Greeceen
CreatorMertikas Stylianosen
CreatorΜερτικας Στυλιανοςel
CreatorPartsinevelos Panagiotisen
CreatorΠαρτσινεβελος Παναγιωτηςel
CreatorTripolitsiotis Achilleasen
CreatorΤριπολιτσιωτης Αχιλλεαςel
CreatorKokolakis Konstantinosen
CreatorΚοκολακης Κωνσταντινοςel
CreatorPetrakis Georgiosen
CreatorΠετρακης Γεωργιοςel
CreatorFrantzis Xenofonen
CreatorΦραντζης Ξενοφωνel
PublisherMDPIen
Content SummaryWater vapor is one of the essential variables in monitoring the Earth’s climate. The Ocean and Land Color Instrument (OLCI) on-board the Copernicus Sentinel-3 missions measures the Integrated Water Vapor (IWV) column over land and ocean surfaces. Post-launch calibration and validation of satellite measurements constitutes a key process in the operational phase of Earth observation satellites. This work presents the external and independent validation of OLCI-A IWV product using the regional network of continuously operating Global Navigation Satellite System (GNSS) comprised 10 stations distributed over the island of Crete in the eastern Mediterranean. The Sentinel-3A/-3B OLCI imagery that captures in a single scene the entire area of Crete has been examined. For each OLCI image, the IWV value of cloud-free pixels containing the GNSS stations have been derived and compared against simultaneous GNSS-derived measurements. The absolute as well as the relative bias between OLCI-A and OLCI-B IWV measurements have been determined. There is a good agreement between OLCI and GNSS with a bias of −0.57 mm ± 2.90 mm for OLCI(A) and +2.42 ± 3.41 mm for OLCI(B). The results of this regional validation activity are compared against other studies and the regular validation carried out at the Sentinel-3 Mission Performance Center. This work concludes that the accuracy of the OLCI IWV products is within its design requirements. The potential synergy between Sentinel-2 and Sentinel-3 IWV products is also discussed.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2021-06-29-
Date of Publication2020-
SubjectIntegrated Water Vapor (IWV)en
SubjectValidationen
SubjectGlobal Navigation Satellite System (GNSS)en
SubjectCreteen
SubjectFiducial reference measurementsen
Bibliographic CitationS. Mertikas, P. Partsinevelos, A. Tripolitsiotis, C. Kokolakis, G. Petrakis, and X. Frantzis, “Validation of Sentinel-3 OLCI integrated water vapor products using regional GNSS measurements in Crete, Greece”, Remote Sens., vol. 12, no. 16, Aug. 2020. doi: 10.3390/rs12162606en

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