POSC Specifications
Version 3.0
Epicentre Standard Values
ref_north_axis_direction

ref_north_axis_direction

Standard Instance Values

identifier description source version status
      ref _version .identifier  
true The north direction as defined by the true north pole. The true north pole is an average of the actual measured north axis, which is the axis of rotation of the earth. POSC epicentre 2.1 current
magnetic The north direction as defined by the magnetic north pole at the time of the measurement. The magentic north pole is the direction that a magnet will point to when freely rotating. POSC epicentre 2.1 current
local grid The north direction is defined by the coordinate grid in the projection coordinate system. POSC epicentre 2.1 current
geodetic north The north direction is the axis of symmetry of the ellipsoid that is used to define the geodetic coordinate system. POSC epicentre 2.1 current
unknown It is not known which of the above is used to define the north direction. POSC epicentre 2.1 current

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