https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.6 2026-03-19T10:41:57.720Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/c5058bd9-6183-4c0a-a6aa-611540ba1196 SSM/I Date=2015-05-01 User Id=aaleman Entity=PrefLabel Operation=UPDATE Field=text User Note=added slash to accommodate data centers' use of short name System Note=update PrefLabel Old Value=SSMI New Value=SSM/I [Source: National Space Science Data Center, http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1990-105A-05 ]The purpose of the microwave imager, SSM/I, is to provide day and night measurements of ocean surface wind speed, ice coverage and age, area and intensity of precipitation, cloud water content and land surface moisture. An estimate of atmospheric attenuation at each of the SSM/I sensor frequencies is also available. Microwave brightness temperatures are obtained with a seven-channel passive microwave radiometer operating at four frequencies, three with both vertical and horizontal polarization (19.35, 37.0, 85.5 GHz) and one with vertical polarization (22.23 GHz). The instrument scans across the ground track to gather data over an approximate 1400-km swath width with horizontal resolutions 13 to 50 km for different frequencies. The data can be used for tropical storm reconnaissance, ship routing in polar regions, agricultural weather, aircraft routing and refueling, etc.Group: Instrument_Details Entry_ID: SSM/I Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Spectrometers/Radiometers Instrument_Subtype: Imaging Spectrometers/Radiometers Short_Name: SSM/I Long_Name: Special Sensor Microwave/Imager End_Group Group: Associated_Platforms Short_Name: DMSP 5D-2/F8 Short_Name: DMSP 5D-2/F10 Short_Name: DMSP 5D-2/F11 Short_Name: DMSP 5D-2/F12 Short_Name: DMSP 5D-2/F13 Short_Name: DMSP 5D-2/F14 Short_Name: DMSP 5D-3/F15 Short_Name: DMSP 5D-3/F16 End_Group Group: Spectral_Frequency_Information Number_Channels: 3 Spectral_Frequency_Coverage_Range: Vertical and Horizontal Polarization 19.35, 37.0, 85.5 GHz End_Group Group: Spectral_Frequency_Information Number_Channels: 1 Spectral_Frequency_Coverage_Range: Vertical Polarization 22.23 GHz End_Group Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1990-105A-05 Online_Resource: http://www.ssmi.com/ Online_Resource: http://www.discover-earth.org/ocean_surface_wind/ocean_surface_wind.html Group: Instrument_Logistics Instrument_Owner: Department of Defense-Department of the Air Force (United States) End_GroupEnd_Group 2015-05-01 15:35:09.0