Bidirectional Reflectance Round-Robin in Support of the Earth Observing System Program

E. A. Early Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, Maryland

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P. Y. Barnes Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, Maryland

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B. C. Johnson Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, Maryland

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J. J. Butler Space Geodesy Networks and Sensor Calibration Office, NASA Goddard Space Flight Center, Greenbelt, Maryland

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C. J. Bruegge Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California

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S. F. Biggar Remote Sensing Group, Optical Sciences Center, The University of Arizona, Tuscon, Arizona

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P. R. Spyak Remote Sensing Group, Optical Sciences Center, The University of Arizona, Tuscon, Arizona

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M. M. Pavlov Raytheon Santa Barbara Remote Sensing, Goleta, California

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Abstract

Laboratory measurements of the bidirectional reflectance distribution function (BRDF) of diffuse reflectors are required to support calibration in the Earth Observing System (EOS) program of the National Aeronautics and Space Administration. To assess the ability of the instrument calibration laboratories to perform accurate BRDF measurements, a round-robin with the National Institute of Standards and Technology (NIST) as the central laboratory was initiated by the EOS Project Science Office. The round-robin parameters include sample type, wavelength, and incident and viewing angles. The results show that the participating calibration laboratories are, with a few exceptions due to experimental techniques or sample properties, generally able to measure BRDF for the round-robin parameters to within 2% of the values measured by NIST.

Corresponding author address: Dr. Edward A. Early, National Institution of Standards and Technology, 100 Bureau Dr., Stop 8442, Gaithersburg, MD 20899-8442.

Email: edward.early@nist.gov

Abstract

Laboratory measurements of the bidirectional reflectance distribution function (BRDF) of diffuse reflectors are required to support calibration in the Earth Observing System (EOS) program of the National Aeronautics and Space Administration. To assess the ability of the instrument calibration laboratories to perform accurate BRDF measurements, a round-robin with the National Institute of Standards and Technology (NIST) as the central laboratory was initiated by the EOS Project Science Office. The round-robin parameters include sample type, wavelength, and incident and viewing angles. The results show that the participating calibration laboratories are, with a few exceptions due to experimental techniques or sample properties, generally able to measure BRDF for the round-robin parameters to within 2% of the values measured by NIST.

Corresponding author address: Dr. Edward A. Early, National Institution of Standards and Technology, 100 Bureau Dr., Stop 8442, Gaithersburg, MD 20899-8442.

Email: edward.early@nist.gov

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