The GPM Ground Validation Advanced Microwave Radiometer Rain Identification (ADMIRARI) GCPEx dataset measures brightness temperature at three frequencies (10.7, 21.0 and 36.5 GHz) and at two polarized planes (H & V). The ADMIRIRI retrieval typically provides rain/cloud liquid water path (LWP) and integrated water vapor, and for low water content cases it provides the total LWP and integrated water vapor. The ADMIRARI is a scanning radiometer like its auxiliary active instruments, which include a Micro Rain Radar (MRR) and a cloud lidar, which provide reflectivity profiles and cloud base altitude at the same scanning angle as the ADMIRIRI. This data was collected during the GPM Cold-season Precipitation Experiment (GCPEx) located in Ontario, Canada, January 14, 2012 through February 29, 2012. Reference: http://www2.meteo.uni-bonn.de/admirari.