POSC Specifications
Version 3.0
Epicentre Standard Values
ref_vertical_datum

ref_vertical_datum

Standard Instance Values

identifier description source version status
      ref _version .identifier  
geoidal The datum is based on a gravity, isopotential surface. POSC epicentre 3.0 current
ellipsoidal The datum is the ellipsoid surface of the horizontal geodetic datum. POSC epicentre 3.0 current
general vertical reference datum The datum is a widely recognized description of a surface that is defined, usually by statute, to define the zero elevation surface. POSC epicentre 3.0 current
local The datum is a local marker, which is used for convenience in a particular survey or close set of surveys. It is generally not recognized by any standards or legal body, but may be. Examples would be a particular point on a drilling rig, a particular rock in a survey area, or a USGA benchmark. POSC epicentre 3.0 current
unknown It is not known what type of vertical datum this is. POSC epicentre 3.0 current

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