As of January 19, 2021, FTP access to the GPM research / production data server "arthurhou" is no longer available, and you must use either FTPS or HTTPS to access GPM research data. Click here to learn more.

How does GPM work?

The GPM Core Observatory satellite carries two instruments (the GPM Microwave Imager (GMI) and the Dual-frequency Precipitation Radar (DPR)) that measure properties of precipitation from space using a combination of active and passive remote-sensing techniques. Together, these measurements provide insights into behavior and characteristics of precipitation and provide a source for calibrating, unifying, and improving precipitation measurements from a constellation of research and operational satellites with microwave sensors in order to create a global dataset of precipitation measurements.