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• Open Geospatial Consortium (OGC)

• Orbit

• Orbit Altitude

• Orbit Inclination

• Orbit Apogee

• Orbit Ascending Node

• Orbit Perigee

• Orbit Period

• Orbital Plane

• Orbital Track

• Orbit Eccentricity

• Orange

• Object-Based Classification

• Orbit Descending Node

• Orbiter Mission

• Open channel flow

• Overbank flow channel

• Outflow

• Ocean

• Outlet

• Oxidation

• Oxygen demand

• Open Data

• Oxidizer

• Open Geospatial Consortium (OGC) compliant

• Optical Remote Sensing

• Overlay Index Methodology

• Oxygen cycle

• Ocean salinity

• Oil spill

• Ocean colour

• Ocean circulation

• Ocean evaporation

• Ocean (deep water zone)

• Ocean (mixed zone)

• Oil spill

• Oil pollution

• Ocean Temperature

• Oceanography