 Canada's Radarsat Constellation Mission, RCM, utilizes a hybrid compact polarimetric, HCP, architecture with circularly polarized transmission, to provide operational users with high-quality quantitative information about their applications, but image classification methodologies for linearly polarized full-polarization radars may lead to erroneous results when applied to HCP-derived data. HCP-appropriate classifications are based on the stokes vector and analysis tools appropriate for HCP's polarimetric data are introduced, showing that the resulting polarimetric portraits from Fp and HCP polarimeters are equivalent. This article was authored by R. Keith Rainey, Brian Briscoe, Mohamed Daboy, and others.