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RA Regional Association of WMO
RARS Regional ATOVS Re-transmission System (WMO)
RAMSDIS Menu-driven system for analysing digital satellite imagery (McIDAS, USA)
RAOBS Radiosonde Observations
RASA Russian Aviation and Space Agency
RDCP Regional DCP (Japan)
RDR Raw Data Records (NPOESS)
Resurs-DK Russian land observing satellite (Roscosmos)
RFI Radio Frequency Interference
RLAN new wireless LANs
RMS Root Mean Square
RMTC Regional Meteorological Training Centre (WMO)
Roscosmos [Russian] Federal Space Agency
Roshydromet Russian Federal Service for Hydrometeorology and Environmental Monitoring
RSB Reflective Solar Bands (MODIS NOAA)
RSMC Regional Specialised Meteorological Centre
RSO Rapid Scan Operations (NOAA)
RSS Rapid Scan Service (EUMETSAT)
RT Radiative Transfer