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dc.contributor.authorLehmann, Moritz K.en_NZ
dc.contributor.authorNguyen, Uyenen_NZ
dc.contributor.authorAllan, Mathewen_NZ
dc.contributor.authorvan der Woerd, Hendrik Janen_NZ
dc.date.accessioned2018-08-21T03:58:52Z
dc.date.available2018en_NZ
dc.date.available2018-08-21T03:58:52Z
dc.date.issued2018en_NZ
dc.identifier.citationLehmann, M. K., Nguyen, U., Allan, M., & van der Woerd, H. J. (2018). Colour classification of 1486 lakes across a wide range of optical water types. Remote Sensing, 10(8). https://doi.org/10.3390/rs10081273en
dc.identifier.issn2072-4292en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/12028
dc.description.abstractRemote sensing by satellite-borne sensors presents a significant opportunity to enhance the spatio-temporal coverage of environmental monitoring programmes for lakes, but the estimation of classic water quality attributes from inland water bodies has not reached operational status due to the difficulty of discerning the spectral signatures of optically active water constituents. Determination of water colour, as perceived by the human eye, does not require knowledge of inherent optical properties and therefore represents a generally applicable remotely-sensed water quality attribute. In this paper, we implemented a recent algorithm for the retrieval of colour parameters (hue angle, dominant wavelength) and derived a new correction for colour purity to account for the spectral bandpass of the Landsat 8 Operational Land Imager (OLI). We used this algorithm to calculate water colour on almost 45,000 observations over four years from 1486 lakes from a diverse range of optical water types in New Zealand. We show that the most prevalent lake colours are yellow-orange and blue, respectively, while green observations are comparatively rare. About 40% of the study lakes show transitions between colours at a range of time scales, including seasonal. A preliminary exploratory analysis suggests that both geo-physical and anthropogenic factors, such as catchment land use, provide environmental control of lake colour and are promising avenues for future analysis.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherMDPI AGen_NZ
dc.relation.urihttp://www.mdpi.com/2072-4292/10/8/1273en_NZ
dc.rights© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
dc.subjectlakesen_NZ
dc.subjectLandsat 8en_NZ
dc.subjectdominant wavelengthen_NZ
dc.subjectcolouren_NZ
dc.subjectNew Zealanden_NZ
dc.subjectpurityen_NZ
dc.titleColour classification of 1486 lakes across a wide range of optical water typesen_NZ
dc.typeJournal Article
dc.identifier.doi10.3390/rs10081273en_NZ
dc.relation.isPartOfRemote Sensingen_NZ
pubs.elements-id226469
pubs.issue8en_NZ
pubs.volume10en_NZ


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