POSC Specifications: Epicentre Version 3.0 Logical Data Model

PTY_STATION_RELATIVE_LOCATION (C010, C108, C138)

(Rules) (Express)

Defines the location of seismic stations relative to each other. Three values are required at each relevant node of the grid defined by attribute seismic station uid in the associated seismic geometry set. One of the values must be "seismic station uid" which specifies the reference station that a station is being positioned relative to. The two values "x" and "y" can be additionally defined to describe offline points using a right handed Cartesian coordinate system where the origin is at the reference station, the x-axis is along the line between the reference station and the next station in the direction of increasing "acquisition point index" and "z" is upward. Alternatively, the two values "azimuth" and one of either "range" or "chained distance" can be additionally defined. "Range" defines a horizontal distance and "chained distance" defines a distance along the surface. In order to locate the station represented by a node, one stands at the reference station and moves in the specified distance and direction.


Local rules:

Supertype path(s):

Entity projects as table P_STATION_RELATIVE_LOCATION.


Generated on Tue Jul 10 15:50:46 2001
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