The Global Precipitation Measurement (GPM) Microwave Imager (GMI) instrument is a multi-channel, conical- scanning, microwave radiometer serving an essential role in the near-global-coverage and frequent-revisit-time requirements of GPM.
The GMI is characterized by thirteen microwave channels ranging in frequency from 10 GHz to 183 GHz. In addition to carrying channels similar to those on the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI), the GMI carries four high frequency, millimeter-wave, channels about 166 GHz and 183 GHz.
With a 1.2 m diameter antenna, the GMI will provide significantly improved spatial resolution over TMI.
Learn more: https://pmm.nasa.gov/GPM/flight-project/GMI
- GPM's Microwave Imager (GMI) can measure rainfall rates within storm systems to quantify the impact of tropical cyclones and other storm systems.
- GMI data is integrated into multiple Numerical Weather Prediction models to initialize weather forecasts with observational data and improve storm track prediction, including the Naval Research Lab (NRL) Automated Tropical Cyclone Forecasting system (ATCF), the Joint Center for Satellite Data Assimilation (JCSDA/NOAA) Global Data Assimilation System (GDAS), and the European Centre for Medium-Range Weather Forecasts (ECMWF) (https://science.gsfc.nasa.gov/610/applied-sciences/mission_applications_materials/GPMApplicationsExamples22017.pdf)