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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Optical types of inland and coastal waters
Author(s): Spyrakos, Evangelos
O'Donnell, Ruth
Hunter, Peter
Miller, Claire
Scott, E Marian
Simis, Stefan
Neil, Claire
Barbosa, Claudio
Binding, Caren
Bradt, Shane
Bresciani, Mariano
Dall'Olmo, Giorgio
Giardino, Claudia
Gitelson, Anatoly
Kutser, Tiit
Li, Lin
Matsushita, Bunkei
Martinez-Vicente, Victor
Matthews, Mark
Ogashawara, Igor
Ruiz-Verdu, Antonio
Schalles, John
Tebbs, Emma
Zhang, Yunlin
Tyler, Andrew
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Issue Date: Mar-2018
Date Deposited: 6-Oct-2017
Citation: Spyrakos E, O'Donnell R, Hunter P, Miller C, Scott EM, Simis S, Neil C, Barbosa C, Binding C, Bradt S, Bresciani M, Dall'Olmo G, Giardino C, Gitelson A, Kutser T, Li L, Matsushita B, Martinez-Vicente V, Matthews M, Ogashawara I, Ruiz-Verdu A, Schalles J, Tebbs E, Zhang Y & Tyler A (2018) Optical types of inland and coastal waters. Limnology and Oceanography, 63 (2), pp. 846-870.
Abstract: Inland and coastal waterbodies are critical components of the global biosphere. Timely monitoring is necessary to enhance our understanding of their functions, the drivers impacting on these functions and to deliver more effective management. The ability to observe waterbodies from space has led to Earth observation (EO) becoming established as an important source of information on water quality and ecosystem condition. However, progress toward a globally valid EO approach is still largely hampered by inconsistences over temporally and spatially variable in-water optical conditions. In this study, a comprehensive dataset from more than 250 aquatic systems, representing a wide range of conditions, was analyzed in order to develop a typology of optical water types (OWTs) for inland and coastal waters. We introduce a novel approach for clustering in situ hyperspectral water reflectance measurements (n = 4045) from multiple sources based on a functional data analysis. The resulting classification algorithm identified 13 spectrally distinct clusters of measurements in inland waters, and a further nine clusters from the marine environment. The distinction and characterization of OWTs was supported by the availability of a wide range of coincident data on biogeochemical and inherent optical properties from inland waters. Phylogenetic trees based on the shapes of cluster means were constructed to identify similarities among the derived clusters with respect to spectral diversity. This typification provides a valuable framework for a globally applicable EO scheme and the design of future EO missions.
DOI Link: 10.1002/lno.10674
Rights: © 2017 The Authors Limnology and Oceanography published by Wiley Periodicals, Inc. on behalf of Association for the Sciences of Limnology and Oceanography This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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