Laboratory Intercomparison of Radiometers Used for Satellite Validation in the 400– 900 nm Range

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dc.contributor.authorVabson, Viktor
dc.contributor.authorKuusk, Joel
dc.contributor.authorAnsko, Ilmar
dc.contributor.authorVendt, Riho
dc.contributor.authorAlikas, Krista
dc.contributor.authorRuddick, Kevin
dc.contributor.authorAnsper, Ave
dc.contributor.authorBresciani, Mariano
dc.contributor.authorBurmester, Henning
dc.contributor.authorCosta, Maycira
dc.contributor.authorD’Alimonte, Davide
dc.contributor.authorDall’Olmo, Giorgio
dc.contributor.authorDamiri, Bahaiddin
dc.contributor.authorDinter, Tilman
dc.contributor.authorGiardino, Claudia
dc.contributor.authorKangro, Kersti
dc.contributor.authorLigi, Martin
dc.contributor.authorPaavel, Birgot
dc.contributor.authorTilstone, Gavin
dc.contributor.authorVan Dommelen, Ronnie
dc.contributor.authorWiegmann, Sonja
dc.contributor.authorBracher, Astrid
dc.contributor.authorDonlon, Craig
dc.contributor.authorCasal, Tânia
dc.date.accessioned2020-01-04T18:50:43Z
dc.date.available2020-01-04T18:50:43Z
dc.date.copyright2019en_US
dc.date.issued2019
dc.description.abstractAn intercomparison of radiance and irradiance ocean color radiometers (The Second Laboratory Comparison Exercise—LCE-2) was organized within the frame of the European Space Agency funded project Fiducial Reference Measurements for Satellite Ocean Color (FRM4SOC) May 8–13, 2017 at Tartu Observatory, Estonia. LCE-2 consisted of three sub-tasks: 1) SI-traceable radiometric calibration of all the participating radiance and irradiance radiometers at the Tartu Observatory just before the comparisons; 2) Indoor intercomparison using stable radiance and irradiance sources in controlled environment; and 3) Outdoor intercomparison of natural radiation sources over terrestrial water surface. The aim of the experiment was to provide one link in the chain of traceability from field measurements of water reflectance to the uniform SI-traceable calibration, and after calibration to verify whether different instruments measuring the same object provide results consistent within the expected uncertainty limits. This paper describes the activities and results of the first two phases of LCE-2: the SI-traceable radiometric calibration and indoor intercomparison, the results of outdoor experiment are presented in a related paper of the same journal issue. The indoor experiment of the LCE-2 has proven that uniform calibration just before the use of radiometers is highly effective. Distinct radiometers from different manufacturers operated by different scientists can yield quite close radiance and irradiance results (standard deviation s < 1%) under defined conditions. This holds when measuring stable lamp-based targets under stationary laboratory conditions with all the radiometers uniformly calibrated against the same standards just prior to the experiment. In addition, some unification of measurement and data processing must be settled. Uncertainty of radiance and irradiance measurement under these conditions largely consists of the sensor’s calibration uncertainty and of the spread of results obtained by individual sensors measuring the same object.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThis work was funded by European Space Agency project Fiducial Reference Measurements for Satellite Ocean Color (FRM4SOC), contract no. 4000117454/16/I-Sbo.en_US
dc.identifier.citationVabson, V., Kuusk, J., Ansko, I., Vendt, R., Alikas, K., Ruddick, K.,… Casal, T. (2019). Laboratory Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range. Remote Sensing, 11(9), 1101. https://doi.org/10.3390/rs11091101en_US
dc.identifier.urihttp://dx.doi.org/10.3390/rs11091101
dc.identifier.urihttp://hdl.handle.net/1828/11459
dc.language.isoenen_US
dc.publisherRemote Sensingen_US
dc.subjectocean color radiometers
dc.subjectradiometric calibration
dc.subjectindoor intercomparison measurement
dc.subjectagreement between sensors
dc.subjectmeasurement uncertainty
dc.subject.departmentDepartment of Geography
dc.titleLaboratory Intercomparison of Radiometers Used for Satellite Validation in the 400– 900 nm Rangeen_US
dc.typeArticleen_US

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