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ICESat Ice Cloud and Land Elevation Satellite (NASA)
ICI Inversion Coupled with Imager (Meteo-France)
ICSC CAS International Core Steering Committee (THORPEX)
ICWG International Coordination Working Group (EO)
IDCP International DCP
IDCS International Data Collection System
IDDI Infra-red Difference Dust Index
IDN International Directory Network (CEOS)
IDPS Interface Data Processing Segment (NPOESS)
IFRB International Frequency Registration Board
IGACO Integrated Global Atmospheric Chemistry Observations (IGOS)
IGDDS Integrated Global Data Dissemination Service
IGEOLab International Geostationary Laboratory concept
IJPS Initial Joint Polar-orbiting Operational Satellite System
IKFS-2 Advanced IR atmospheric sounder
IMT-2000 International Mobile Telecommunication 2000 (before FPLMTS)
INSAT Indian geostationary satellite
IOC Intergovernmental Oceanographic Commission (UNESCO)
IODC Indian Ocean Data Coverage
IOP Initial Operations Phase (SAF, EUMETSAT)
IOTWS Indian Ocean Tsunami Warning Service
IPO Integrated Program Office (NOAA)
IPOMS International Polar-orbiting Meteorological Satellite Group
IPWG International Precipitation Working Group
IPY International Polar Year (ICSU, WMO)
IQGSE Image Quality Ground Support Equipment (EUMETSAT)
IR Infrared
IRAS Infrared Atmospheric Sounder (FY-3, CMA)
IRTS Infrared Temperature Sounder (EPS)
IRW Infrared Window
ISS Information Systems and Services; International Space Station
ISCCP International Satellite Cloud Climatology Project (GEWEX, WCRP)
ISADP Integrated System for the ATOVS Data ProcessingIntegrated System for the ATOVS Data Processing
ISWMR SAF Integrated Satellite Wind Monitoring Report (EUMETSAT)
ITSC International TOVS Study Conference
ITT Invitation to Tender
ITU International Telecommunication Union
ITWG International TOVS Working Group
IVOS Infrared and Visible Optical System Calibration (CEOS WGCV)
IWW International Winds Workshop
IWWG International Winds Working Group