Spatial Reference Frames

Spatial Reference Frames (SRF) serve to locate coordinates in a multi-dimensional space (generally either two- or three-dimensional). Specified in two parts:

• A geometric description (model) of a reference object embedded in (and serving to orient) that frame -- referred to as an Object Reference Model (ORM) an Earth Reference Model (ERM) is a special case of an ORM
• A Coordinate System (CS) specifying how a tuple of values uniquely determine a location with respect to the origin of that frame. By extension, that tuple also specifies a location with respect to the reference object.

SRF = ORM + CS

There are no “naked” coordinate systems (in SEDRIS)

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