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NASA National Aeronautics and Space Agency
NASDA National Space Development Agency of Japan (changed to JAXA in 2003)
NEDT Noise Equivalent Delta Temperature
NESDIS National Environmental Satellite Data and Information Service
NGDC National Geophysical Data Centre (USA)
NGSO Non-geostationary systems
NIST US National Institute of Standards and Technology
NMC National Meteorological Centre
NMHS National Meteorological & Hydrological Service
NMP EO-1 New Millennium Program Earth Observing Mission (NASA)
NOAA National Oceanic and Atmospheric Administration
NOS National Ocean Service (USA)
NPOESS National Polar-orbiting Operational Environmental Satellite System (USA)
NPP National Polar-orbiting Partnership
NSMC National Satellite Meteorological Center of CMA (PRC)
NTIA National Telecommunications and Information Agency (USA)
NWP Numerical Weather Prediction
NWS National Weather Service (USA)