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2017 (3)
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4 documents, page 1 of 1

Variability of adjacency effects in sky reflectance measurements

Groetsch, Philipp M. M.; Gege, Peter; Simis, Stefan G. H.; Eleveld, Marieke A.; Peters, Steef W. M. (2017)
Projects: EC | TAPAS (678396)
Sky reflectance Rsky(l) is used to correct in situ reflectance measurements in the remote detection of water\ud colour. We analysed the directional and spectral variability in Rsky(l) due to adjacency effects against\ud an atmospheric radiance model. The analysis is based\ud on one year of semi-continuous Rsky(l) observations\ud that were recorded in two azimuth directions. Adjacency\ud effects contributed to Rsky(l) dependent on season and viewing angle, and predominantly in the near-infrare...

Repeatability, Reproducibility, Separative Power and Subjectivity of Different Fish Morphometric Analysis Methods

Tak?cs, P?ter; Vit?l, Zolt?n; Ferincz, ?rp?d; Staszny, ?d?m (2016)
Projects: EC | TAPAS (678396)
We compared the repeatability, reproducibility (intra- and inter-measurer similarity), separative power and subjectivity (measurer effect on results) of four morphometric methods frequently used in ichthyological research, the "traditional" caliper-based (TRA) and truss-network (TRU) distance methods and two geometric methods that compare landmark coordinates on the body (GMB) and scales (GMS). In each case, measurements were performed three times by three measurers on the same specimen of th...

Shellfish Aquaculture from Space: Potential of Sentinel2 to Monitor Tide-Driven Changes in Turbidity, Chlorophyll Concentration and Oyster Physiological Response at the Scale of an Oyster Farm

Gernez, Pierre; Doxaran, David; Barillé, Laurent (2017)
Projects: EC | TAPAS (678396), EC | HIGHROC (606797)
The algorithms of Novoa et al. (2017) and Gons et al. (2005) were recalibrated and applied to Sentinel2 data to retrieve suspended particulate matter (SPM) and chlorophyll a (chl a) concentration in the environmentally and economically important intertidal zones. Sentinel2-derived chl a and SPM concentration distributions were analyzed at the scale of an oyster farm over a variety of tidal conditions. Sentinel2 imagery was then coupled with ecophysiological modeling to analyze the influence o...

Validation of a spectral correction procedure for sun and sky reflections in above-water reflectance measurements

Groetsch, Philipp M. M.; Gege, Peter; Simis, Stefan G. H.; Eleveld, Marieke A.; Peters, Steef (2017)
Projects: EC | TAPAS (678396), EC | JERICO (262584), EC | PROTOOL (226880), EC | DEVOTES (308392), EC | INFORM (606865), EC | WATERS (251527), EC | AQUA-USERS (607325), EC | COBIOS (263295)
A three-component reflectance model (3C) is applied to above-water radiometric measurements to derive remote-sensing reflectance Rrs(l). 3C provides a spectrally resolved offset D(l) to correct for residual sun and sky radiance (Rayleigh- and aerosol-scattered) reflections on the water surface that were not represented by sky radiance measurements. 3C is validated with a data set of matching above- and below-water radiometric measurements collected in the Baltic Sea, and compared against a...