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Revised Universal Soil Loss Equation
RUSLE Factor Calculation
Remote Sensing
Red
Radio
Radiation Laws
Radiation Interaction
Reflection
Remote Sensors
Radar
Ranging Instrument
Radiometers
Resolution
Radiometric Resolution
Remote Sensor Platform
Robotic Space Exploration Missions
Red-Edge
ROSA
ROSCOSMOS
Retarding basin
Relative evaporation
Return flow
Rain
Rapids
Reservoir
River
River basin
River bed
River mouth
River system
Runoff
Recharge
Recharge area
Rainwater harvesting
Regulating reservoir
Regulated flow
Radioglaciology
Rocket Engine
Rocket Fuel
Radioisotope Thermoelectric Generators (RTGs)
Reaction Wheels
Radiation Hardened Computers
Radiators
Resilience
Risk
Regulations
Relative permeability
River discharge
River velocity
Rainfall rate
Rainfall intensity
Recovery
Rural water
River gauge
Reference System
Regional Gravity Field
Radiative transfer
RADARSAT
Radar altimeters
Rain radar
River Course Management
River Catchment (Area)
Residual method of the energy balance
River pollution
Remediation
Rehabilitation
Ramsar site
Rill erosion
Ranching
River level