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

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Technical University of Crete   

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Validation of Sentinel-3 OLCI integrated water vapor products using regional GNSS measurements in Crete, Greece (EN)
Κοκολακης Κωνσταντινος (EL)
Τριπολιτσιωτης Αχιλλεας (EL)
Φραντζης Ξενοφων (EL)
Παρτσινεβελος Παναγιωτης (EL)
Πετρακης Γεωργιος (EL)
Μερτικας Στυλιανος (EL)
Mertikas Stylianos (EN)
Kokolakis Konstantinos (EN)
Partsinevelos Panagiotis (EN)
Petrakis Georgios (EN)
Tripolitsiotis Achilleas (EN)
Frantzis Xenofon (EN)
journalArticle
2020
Water 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)
Validation (EN)
Integrated Water Vapor (IWV) (EN)
Crete (EN)
Fiducial reference measurements (EN)
Global Navigation Satellite System (GNSS) (EN)
Remote Sensing (EN)
English
MDPI (EN)
Πολυτεχνείο Κρήτης (EL)
Technical University of Crete (EN)
Technical University of Crete
Institutional Repository Technical University of Crete
School of Electrical and Computer Engineering - Journal Publications



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