SMMR and SSM/I-SSMIS Overview

NSIDC archives and distributes daily and monthly data derived from the Special Sensor Microwave Imager/Sounder (SSMIS), the Special Sensor Microwave/Imager (SSM/I), and the Scanning Multichannel Microwave Radiometer (SMMR). Together, these passive microwave sensors offer an extensive data record which spans from 1978 through the present. The products derived from these sensors are offered in two flexible and easy-to-use projections: EASE-Grid and Polar Stereographic.