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Airborne drones can fly under clouds at preferred times, capturing data at cm resolution, filling a significant gap between existing in situ, airborne and satellite remote sensing capabilities. Suitable drones and lightweight cameras are readily available on the market, whereas deriving water quality products from the captured image is not straightforward; vignetting effects, georeferencing, the dynamic nature and high light absorption efficiency of water, sun glint and sky glint effects require careful data processing. This paper presents the data processing workflow behind MapEO water, an end-to-end cloud-based solution that deals with the complexities of observing water surfaces and retrieves water-leaving reflectance and water quality products like turbidity and chlorophyll-a (Chl-a) concentration. MapEO water supports common camera types and performs a geometric and radiometric correction and subsequent conversion to reflectance and water quality products. This study shows validation results of water-leaving reflectance, turbidity and Chl-a maps derived using DJI Phantom 4 pro and MicaSense cameras for several lakes across Europe. Coefficients of determination values of 0.71 and 0.93 are obtained for turbidity and Chl-a, respectively. We conclude that airborne drone data has major potential to be embedded in operational monitoring programmes and can form useful links between satellite and in situ observations.<\/jats:p>","DOI":"10.3390\/rs15051345","type":"journal-article","created":{"date-parts":[[2023,2,28]],"date-time":"2023-02-28T02:01:51Z","timestamp":1677549711000},"page":"1345","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Airborne Drones for Water Quality Mapping in Inland, Transitional and Coastal Waters\u2014MapEO Water Data Processing and Validation"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6400-595X","authenticated-orcid":false,"given":"Liesbeth","family":"De Keukelaere","sequence":"first","affiliation":[{"name":"Vlaamse Instelling Voor Technologisch Onderzoek (VITO), Boeretang 200, 2400 Mol, Belgium"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9119-0206","authenticated-orcid":false,"given":"Robrecht","family":"Moelans","sequence":"additional","affiliation":[{"name":"Vlaamse Instelling Voor Technologisch Onderzoek (VITO), Boeretang 200, 2400 Mol, Belgium"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0557-6151","authenticated-orcid":false,"given":"Els","family":"Knaeps","sequence":"additional","affiliation":[{"name":"Vlaamse Instelling Voor Technologisch Onderzoek (VITO), Boeretang 200, 2400 Mol, Belgium"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0194-7100","authenticated-orcid":false,"given":"Sindy","family":"Sterckx","sequence":"additional","affiliation":[{"name":"Vlaamse Instelling Voor Technologisch Onderzoek (VITO), Boeretang 200, 2400 Mol, Belgium"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8534-9110","authenticated-orcid":false,"given":"Ils","family":"Reusen","sequence":"additional","affiliation":[{"name":"Vlaamse Instelling Voor Technologisch Onderzoek (VITO), Boeretang 200, 2400 Mol, Belgium"}]},{"given":"Dominique","family":"De Munck","sequence":"additional","affiliation":[{"name":"Vlaamse Instelling Voor Technologisch Onderzoek (VITO), Boeretang 200, 2400 Mol, Belgium"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6296-9146","authenticated-orcid":false,"given":"Stefan G.H.","family":"Simis","sequence":"additional","affiliation":[{"name":"Plymouth Marine Laboratory (PML), Plymouth PL1 3DH, UK"}]},{"given":"Adriana Maria","family":"Constantinescu","sequence":"additional","affiliation":[{"name":"Institutul National De Cercetare\u2014Dezvoltare Pentru Geologie Si Geoecologie Marina (GeoEcoMar), 23\u201325 Dimitrie Onciul St., RO-024053 Bucharest, Romania"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6297-8635","authenticated-orcid":false,"given":"Albert","family":"Scrieciu","sequence":"additional","affiliation":[{"name":"Institutul National De Cercetare\u2014Dezvoltare Pentru Geologie Si Geoecologie Marina (GeoEcoMar), 23\u201325 Dimitrie Onciul St., RO-024053 Bucharest, Romania"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3249-3113","authenticated-orcid":false,"given":"Georgios","family":"Katsouras","sequence":"additional","affiliation":[{"name":"Athens Water Suppy and Sewerage Company (EYDAP S.a.), Oropou 156, 11146 Athens, Greece"}]},{"given":"Wim","family":"Mertens","sequence":"additional","affiliation":[{"name":"Instituut Natuur-En Bosonderzoek (INBO) Havenlaan 88 Bus 73, 1000 Brussel, Belgium"}]},{"given":"Peter D.","family":"Hunter","sequence":"additional","affiliation":[{"name":"Earth and Planetary Observation Sciences (EPOS), Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7970-5211","authenticated-orcid":false,"given":"Evangelos","family":"Spyrakos","sequence":"additional","affiliation":[{"name":"Earth and Planetary Observation Sciences (EPOS), Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK"}]},{"given":"Andrew","family":"Tyler","sequence":"additional","affiliation":[{"name":"Earth and Planetary Observation Sciences (EPOS), Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Koparan, C., Koc, A.B., Privette, C.V., and Sawyer, C.B. 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