POSC Specifications: Epicentre Version 3.0 Logical Data Model

COMPOUND_COORDINATE_SYSTEM (Local) (C055, C109, C124, C148, C151)

(Rules) (Express)

This is a combination of two coordinate systems which form a third coordinate system. A typical example is a 'geographic 2d' or a 'projected 2d' horizontal coordinate system, extended to become a 3d system by any gravity related or local vertical coordinate system (e.g. depths w.r.t. instantaneous sea level). Another example is a 'local 2d' coordinate system, extended by a gravity related vertical component. An example of the latter would be a seismic bin grid system combined with Mean Sea Level referenced depths. The order of the values in a coordinate tuple will be the values that represent the axes of the first system followed by the values that represent the axes in the second system. This should not be used to create an aggregate of similar systems, such as two horizontal 2D systems or a horizontal 2D system plus a 3D system which includes a horizontal component.


Local rules:

Supertype path(s):

Entity consolidated into table COORDINATE_SYSTEM.

Referenced in Diagrams:


Generated on Tue Jul 10 15:40:05 2001
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