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+ Earth Observing System > For Scientists > EOS Calibration Program > Artifact Round-Robins EOS Calibration ProgramArtifact Round-RobinsThe EOS Project Science Office and NIST coordinate and oversee calibration artifact round-robin measurement programs. An example of a highly successful, completed artifact round robin measurement program was the EOS Bidirectional Reflectance Distribution Function (BRDF)/Bidirectional Reflectance Function (BRF) Round-robin (see references below). This round-robin was in support of EOS Terra instruments employing diffusers for on-board radiometric calibration. EOS artifact round-robins serve to corroborate the measurement practices, instrumentation, and capability of EOS-related efforts at the EOS instrument calibration facilities, secondary standards facilities, and vicarious calibration facilities. Artifact round-robins are not necessarily held simultaneously with the calibration and characterization of flight hardware. ArticlesBRDFJohnson, B. C., P. Y. Barnes, T. R. O'Brian, J. J. Butler, C. J. Bruegge, S. F. Biggar, P. R. Spyak and M. M. Pavlov, “Initial Results of the Bidirectional Reflectance Characterization Round-Robin in Support of EOS AM-1,” Metrologia 35: 609-613 (1998). E.A. Early, P.Y. Barnes, B.C. Johnson, J.J. Butler, C.J. Bruegge, S.F. Biggar, P.R. Spyak, and M.M. Pavlov, "Bidirectional Reflectance Round-Robin in Support of the Earth Observing System Program," Journal of Atmospheric and Oceanic Technology 17: 1077-1091 (2000). Aperture Area MeasurementsA First Draft of Protocols for an Aperture Area Measurement Round-robin Aperture Area Round-robin Questionnaire Fowler, J. B. and M. Litorja, “Geometric area measurements of circular apertures for radiometry at NIST,” Metrologia 40: S9-S12 (2003). Johnson, B. C., M. Litorja and J. J. Butler, “Preliminary results of aperture area comparison for exo-atmospheric solar irradiance,” Proc. SPIE 5151: 454-462 (2003). |
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