Journal cover Journal topic
Ocean Science An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/osd-8-613-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
30 Mar 2011
Review status
This discussion paper is a preprint. It has been under review for the journal Ocean Science (OS). The revised manuscript was not accepted.
Quality control of automated hyperspectral remote sensing measurements from a seaborne platform
S. P. Garaba1,2, M. R. Wernand3, and O. Zielinski2 1University of Bremen, Department of Geosciences, P.O. Box 330440, 28334 Bremen, Germany
2Institute of Marine Resources, Department of Marine Physics and Sensors, Bussestraße 27, 27570 Bremerhaven, Germany
3Royal Netherlands Institute for Sea Research, Physical Oceanography, Marine Optics & Remote Sensing, P.O. Box 59, 1790AB Den Burg, Texel, The Netherlands
Abstract. In this study four data quality flags are presented for automated and unmanned above-water hyperspectral optical measurements collected underway in the North Sea, The Minch, Irish Sea and Celtic Sea in April/May 2009. Coincident to these optical measurements a DualDome D12 (Mobotix, Germany) camera system was used to capture sea surface and sky images. The first three flags are based on meteorological conditions, to select erroneous incoming solar irradiance (ES) taken during dusk, dawn, before significant incoming solar radiation could be detected or under rainfall. Furthermore, the relative azimuthal angle of the optical sensors to the sun is used to identify possible sunglint free sea surface zones. A total of 629 spectra remained after applying the meteorological masks (first three flags). Based on this dataset, a fourth flag for sunglint was generated by analysing and evaluating water leaving radiance (LW) and remote sensing reflectance (RRS) spectral behaviour in the presence and absence of sunglint salient in the simultaneously available sea surface images. Spectra conditions satisfying "mean LW (700–950 nm) < 2 mW m−2 nm−1 Sr−1" or alternatively "minimum RRS (700–950 nm) < 0.010 Sr−1", mask the most measurements affected by sunglint, providing efficient flagging of sunglint in automated quality control. It is confirmed that valid optical measurements can be performed 0° ≤ Φ ≤ 360° although 90° ≤ Φ ≤ 135° is recommended.

Citation: Garaba, S. P., Wernand, M. R., and Zielinski, O.: Quality control of automated hyperspectral remote sensing measurements from a seaborne platform, Ocean Sci. Discuss., 8, 613-638, https://doi.org/10.5194/osd-8-613-2011, 2011.
S. P. Garaba et al.
S. P. Garaba et al.

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