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AKA global or absolute.
WGS 84:
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https://en.wikipedia.org/wiki/World_Geodetic_System
Axis | Origin |
|---|---|
Latitude [decimal degrees] |
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Equator, north is positive | |
Longitude [decimal degrees |
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] |
Increasing altitude is moving away from centre of the Earth
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IERS reference meridian (IRM) (prime meridian), |
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east is positive | |
Altitude [metres] | Mean sea level, away from centre of Earth is positive |
World space relative altitude
AKA global relative altitude.
WGS 84: https://en.wikipedia.org/wiki/World_Geodetic_System
Local space
North east down (NED):
Axes (Euclidean): North [metres], east [metres], down [metres]
Increasing value of down is moving towards centre of the Earth
Origin (usually takeoff point): Latitude of home position, longitude of home position, altitude of home position (e.g. the ground)
Axis | Origin |
|---|---|
Latitude [decimal degrees] | Equator, north is positive |
Longitude [decimal degrees] | IERS reference meridian (IRM) (prime meridian), east is positive |
Relative altitude [metres] | Home position, away from centre of Earth is positive |
Local space
North east down (NED): https://en.wikipedia.org/wiki/Local_tangent_plane_coordinates
Axis (Euclidean) | Origin |
|---|---|
North [metres] | Home position, north is positive |
East [metres] | Home position, east is positive |
Down [metres] | Home position, towards centre of Earth is positive |
Rotation
The coordinate axes follow the right hand rule. When the axis is pointing towards you and axes are fixed, the angle increases in the counterclockwise direction.
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