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The First SIMBIOS Radiometric Intercomparison (SIMRIC-1), April-September 2001This report describes the first SIMBIOS (Sensor Intercomparison and Merger for Biological and Interdisciplinary Oceanic Studies) Radiometric Intercomparison (SIMRIC-1). The purpose of the SIMRIC-1 is to ensure a common radiometric scale of the calibration facilities that are engaged in calibrating in situ radiometers used for ocean color related research and to document the calibration procedures and protocols. SIMBIOS staff visited the seven participating laboratories for at least two days each. The SeaWiFS Transfer Radiometer SXR-II measured the calibration radiances produced in the laboratories. The measured radiances were compared with the radiances expected by the laboratories. Typically, the measured radiances were higher than the expected radiances by 0 to 2%. This level of agreement is satisfactory. Several issues were identified, where the calibration protocols need to be improved, especially the reflectance calibration of the reference plaques and the distance correction when using the irradiance standards at distances greater than the 50 cm. The responsivity of the SXR-II changed between 0.3% (channel 6) and 1.6% (channel 2) from December 2000 to December 2001. Monitoring the SXR-II with a portable light source showed a linear drift of the calibration, except for channel 1, where a 2% drop occurred in summer.
Document ID
20020045345
Document Type
Technical Memorandum (TM)
Authors
Meister, Gerhard (FutureTech Corp. Greenbelt, MD United States)
Abel, Peter (NASA Goddard Space Flight Center Greenbelt, MD United States)
McClain, Charles (NASA Goddard Space Flight Center Greenbelt, MD United States)
Barnes, Robert (Science Applications International Corp. Greenbelt, MD United States)
Fargion, Giulietta (Science Applications International Corp. Greenbelt, MD United States)
Cooper, John (Raytheon Information Technology and Scientific Services Lanham, MD United States)
Davis, Curtiss (Naval Research Lab. Washington, DC United States)
Korwan, Daniel (Naval Research Lab. Washington, DC United States)
Godin, Mike (HOBI Labs. Watsonville, CA United States)
Maffione, Robert (HOBI Labs. Watsonville, CA United States)
Date Acquired
September 7, 2013
Publication Date
March 1, 2002
Subject Category
Oceanography
Report/Patent Number
NASA/TM-2002-210006
NAS 1.15:210006
Rept-2002-01353-0
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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