This report documents the scientific activities during the eighth SeaWiFS Intercalibration Round-Robin Experiment (SIRREX-8) held at the Center for Hydro-Optics and Remote Sensing (CHORS), the Joint Research Centre (JRC), and Satlantic, Inc. The objectives of SIRREX-8 were to a) quantify the uncertainties associated with measuring the immersion factor with a standard protocol, b) establish if instrument-to-instrument variability prevents the assignment of a set of immersion factors for an entire series of sensors, c) compare average immersion factors obtained from sample OCI-200 radiometers with those provided by Satlantic for the same series of instruments, and d) measure the cosine response of one sensor at CHORS and Satlantic. An overview of SIRREX-8 is given in Chapt. 1, the immersion factor methods used by the participating laboratories are presented in Chapts. 2--4, and the data processing code is documented in Chapt. 5. The cosine response methods and results are presented in Chapt. 6, along with an analysis of the data. A synthesis of the immersion factor results is presented in Chapt. 7 and includes a discussion and conclusion of the effort with respect to the objectives.
