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The First SIMBIOS Radiometric Intercomparison (SIMRIC-1), April-September 2001
NTRS Full-Text: Click to View  [PDF Size: 4.9 MB]
Author and Affiliation:
Meister, Gerhard(FutureTech Corp., SIMBIOS Project, 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., SIMBIOS Project, Greenbelt, MD United States);
Fargion, Giulietta(Science Applications International Corp., SIMBIOS Project, 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);
et al.
Abstract: This 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.
Publication Date: Mar 01, 2002
Document ID:
20020045345
(Acquired Jun 07, 2002)
Subject Category: OCEANOGRAPHY
Report/Patent Number: NASA/TM-2002-210006, Rept-2002-01353-0, NAS 1.15:210006
Document Type: Technical Report
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 70p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: RADIOMETERS; SENSORS; OCEANOGRAPHY; REFLECTANCE; RADIANCE; SEA-VIEWING WIDE FIELD-OF-VIEW SENSOR; CALIBRATING; WATER COLOR; PROTOCOL (COMPUTERS); LIGHT SOURCES
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