Document Description
The Integrated Multi-satellitE Retrievals for the Global Precipitation Measurement (GPM) mission (IMERG) combines precipitation retrievals from all available low-orbit passive microwave (PMW) data, together with geosynchronous infrared (GEO-IR) providing baseline retrievals to compute merged global precipitation every half hour. The IMERG Early Run includes forward propagation of PMW data, while the Late Run also uses backward propagation. IMERG includes the Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave Imager/Sounder (SSMIS) constellation operated by the U.S.
