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Remote Sens. 2018, 10(2), 180;

Hue-Angle Product for Low to Medium Spatial Resolution Optical Satellite Sensors

Institute for Environmental Studies (IVM), Water & Climate Risk, VU University Amsterdam, De Boelelaan 1087, Amsterdam 1081HV, The Netherlands
Royal Netherlands Institute for Sea Research, Coastal Systems, Marine Optics & Remote Sensing, P.O. Box 59, Den Burg 1790AB, Texel, The Netherlands
Author to whom correspondence should be addressed.
Received: 15 November 2017 / Revised: 24 January 2018 / Accepted: 24 January 2018 / Published: 26 January 2018
(This article belongs to the Special Issue Remote Sensing of Ocean Colour)
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In the European Citclops project, with a prime aim of developing new tools to involve citizens in the water quality monitoring of natural waters, colour was identified as a simple property that can be measured via a smartphone app and by dedicated low-cost instruments. In a recent paper, we demonstrated that colour, as expressed mainly by the hue angle (α), can also be derived accurately and consistently from the ocean colour satellite instruments that have observed the Earth since 1997. These instruments provide superior temporal coverage of natural waters, albeit at a reduced spatial resolution of 300 m at best. In this paper, the list of algorithms is extended to the very first ocean colour instrument, and the Moderate Resolution Imaging Spectroradiometer (MODIS) 500-m resolution product. In addition, we explore the potential of the hue angle derivation from multispectral imaging instruments with a higher spatial resolution but reduced spectral resolution: the European Space Agency (ESA) multispectral imager (MSI) on Sentinel-2 A,B, the Operational Land Imager (OLI) on the National Aeronautics and Space Administration (NASA) Landsat-8, and its precursor, the Enhanced Thematic Mapper Plus (ETM+) on Landsat-7. These medium-resolution imagers might play a role in an upscaling from point measurements to the typical 1-km pixel size from ocean colour instruments. As the parameter α (the colour hue angle) is fairly new to the community of water remote sensing scientists, we present examples of how colour can help in the image analysis in terms of water-quality products. View Full-Text
Keywords: hue; colour; CZCS; Landsat-7 and Landsat-8; MERIS; MODIS; MSI; OLCI; SeaWiFS hue; colour; CZCS; Landsat-7 and Landsat-8; MERIS; MODIS; MSI; OLCI; SeaWiFS

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Van der Woerd, H.J.; Wernand, M.R. Hue-Angle Product for Low to Medium Spatial Resolution Optical Satellite Sensors. Remote Sens. 2018, 10, 180.

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