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Variability of adjacency effects in sky reflectance measurements

Groetsch, Philipp M. M. and Gege, Peter and Simis, Stefan G. H. and Eleveld, Marieke A. and Peters, Steef W. M. (2017) Variability of adjacency effects in sky reflectance measurements. Optics Letters, 42 (17), pp. 3359-3362. Optical Society of America. DOI: 10.1364/OL.42.003359 ISSN 0146-9592

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Official URL: https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-17-3359


Sky reflectance Rsky is used to correct in situ reflectance measurements in the remote detection of water color. We analyzed the directional and spectral variability in Rsky due to adjacency effects against an atmospheric radiance model. The analysis is based on one year of semi-continuous Rsky observations that were recorded in two azimuth directions. Adjacency effects contributed to Rsky dependence on season and viewing angle and predominantly in the near-infrared (NIR). For our test area, adjacency effects spectrally resembled a generic Vegetation spectrum. The adjacency effect was weakly dependent on the magnitude of Rayleigh- and aerosol-scattered radiance. The reflectance differed between viewing directions 5.4 +/- 6.3% for adjacency effects and 21.0 +/- 19.8% for Rayleigh- and aerosol-scattered Rsky in the NIR. Under which conditions in situ water reflectance observations require dedicated correction for adjacency effects is discussed. We provide an open source implementation of our method to aid identification of such conditions.

Item URL in elib:https://elib.dlr.de/113966/
Document Type:Article
Additional Information:Developed Software available here: http://doi .org/10.5281/zenodo.836756
Title:Variability of adjacency effects in sky reflectance measurements
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Groetsch, Philipp M. M.groetsch (at) waterinsight.nlUNSPECIFIED
Gege, Peterpeter.gege (at) dlr.dehttps://orcid.org/0000-0003-0939-5267
Simis, Stefan G. H.plymouth marine laboratoryUNSPECIFIED
Eleveld, Marieke A.vrije universiteit amsterdamUNSPECIFIED
Peters, Steef W. M.Water InsightUNSPECIFIED
Date:1 September 2017
Journal or Publication Title:Optics Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1364/OL.42.003359
Page Range:pp. 3359-3362
Publisher:Optical Society of America
Keywords:Atmospheric optics, oceanic optics, remote sensing, sensors, atmospheric correction, radiative transfer, water
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Gege, Dr.rer.nat. Peter
Deposited On:12 Sep 2017 13:01
Last Modified:31 Jul 2019 20:11

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