Co-led by NASA and the Japan Aerospace and Exploration Agency (JAXA), the Tropical Rainfall Measurement Mission (TRMM) and Global Precipitation Measurement (GPM) mission have built unprecedented international cooperation in space asset sharing and scientific collaboration to advance precipitation estimation from space for research and applications. GPM is an international satellite mission specifically designed to unify and advance precipitation measurements from research and operational microwave sensors for delivering next-generation global precipitation data products. The GPM mission