The GPM Core Observatory (IMAGE) NASA/Goddard Space Flight Center Caption The GPM Core Observatory collects precipitation information that unifies data from an international network of existing and future satellites to map global rainfall and snowfall every three hours. Credit NASA's Goddard Space Flight Center/Debbie McCallum Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.