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

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dc.contributor.author Vabson, Viktor
dc.contributor.author Kuusk, Joel
dc.contributor.author Ansko, Ilmar
dc.contributor.author Vendt, Riho
dc.contributor.author Alikas, Krista
dc.contributor.author Ruddick, Kevin
dc.contributor.author Ansper, Ave
dc.contributor.author Bresciani, Mariano
dc.contributor.author Burmester, Henning
dc.contributor.author Costa, Maycira
dc.contributor.author D’Alimonte, Davide
dc.contributor.author Dall’Olmo, Giorgio
dc.contributor.author Damiri, Bahaiddin
dc.contributor.author Dinter, Tilman
dc.contributor.author Giardino, Claudia
dc.contributor.author Kangro, Kersti
dc.contributor.author Ligi, Martin
dc.contributor.author Paavel, Birgot
dc.contributor.author Tilstone, Gavin
dc.contributor.author Van Dommelen, Ronnie
dc.contributor.author Wiegmann, Sonja
dc.contributor.author Bracher, Astrid
dc.contributor.author Donlon, Craig
dc.contributor.author Casal, Tânia
dc.date.accessioned 2020-01-04T18:49:25Z
dc.date.available 2020-01-04T18:49:25Z
dc.date.copyright 2019 en_US
dc.date.issued 2019
dc.identifier.citation Vabson, V., Kuusk, J., Ansko, I., Vendt, R., Alikas, K., Ruddick, K.,… Casal, T. (2019). Field Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range. Remote Sensing, 11(9), 1129. https://doi.org/10.3390/rs11091129 en_US
dc.identifier.uri http://dx.doi.org/10.3390/rs11091129
dc.identifier.uri http://hdl.handle.net/1828/11458
dc.description.abstract An 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, laboratory intercomparison using stable radiance and irradiance sources in a controlled environment; (3) outdoor, field intercomparison of natural radiation sources over a natural water surface. The aim of the experiment was to provide a 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 third phase of LCE-2: The results of the field experiment. The calibration of radiometers and laboratory comparison experiment are presented in a related paper of the same journal issue. Compared to the laboratory comparison, the field intercomparison has demonstrated substantially larger variability between freshly calibrated sensors, because the targets and environmental conditions during radiometric calibration were different, both spectrally and spatially. Major differences were found for radiance sensors measuring a sunlit water target at viewing zenith angle of 139° because of the different fields of view. Major differences were found for irradiance sensors because of imperfect cosine response of diffusers. Variability between individual radiometers did depend significantly also on the type of the sensor and on the specific measurement target. Uniform SI traceable radiometric calibration ensuring fairly good consistency for indoor, laboratory measurements is insufficient for outdoor, field measurements, mainly due to the different angular variability of illumination. More stringent specifications and individual testing of radiometers for all relevant systematic effects (temperature, nonlinearity, spectral stray light, etc.) are needed to reduce biases between instruments and better quantify measurement uncertainties. en_US
dc.description.sponsorship This work was funded by European Spa ce Agency project Fiducial Reference Measurements for Satellite Ocean Color (FRM4SOC), contract No. 4000117454/16/I-Sbo. en_US
dc.language.iso en en_US
dc.publisher Remote Sensing en_US
dc.subject ocean color radiometers en_US
dc.subject radiometric calibration en_US
dc.subject field intercomparison measurement en_US
dc.subject agreement between sensors en_US
dc.subject measurement uncertainty en_US
dc.title Field Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range en_US
dc.type Article en_US
dc.description.scholarlevel Faculty en_US
dc.description.reviewstatus Reviewed en_US

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