Radiometric characterization of the ROCSAT Ocean Color Imager
The Ocean Color Imager (OCI), a multispectral optical imager for observing pigment distributions in low-latitude oceans, has been successfully built and parameterized. To recover at-sensor radiance data, a mathematical model was developed to characterize its radiometric response; the corresponding parameters were identified initially by pre-flight calibration and were adapted in-flight by a method of cross-platform calibration. The cross-platform in-flight calibration was carried out to compare radiance data with data measured by the vicarious orbital sensor at the cross points to determine possible changes in the parameters and performance of the OCI. The radiometric model, the pre-flight parameters and the method of cross-platform in-flight calibration are reported here.