POSC Specifications: Epicentre Version 3.0 | Relational Implementation |
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.
- instance_s (PK, M: CHAR VARYING(19))
- Surrogate key of the table.
- instance_create_date (O: TIMESTAMP)
- e_and_p_data.instance_create_date
This is the date that this instance was created. This date is defined by the source if imported, or is the date the instance is created if a new instance.
- last_updated (O: TIMESTAMP)
- e_and_p_data.last_updated
This is the date that this instance was last updated. This value should be updated when any part of this instance is altered (except for inverse relationships).
- data_value_sl (O: CHAR VARYING(16))
- pty_station_relative_location.data_value
The relative location information at each relevant node of the seismic station uid grid.
- description (O: CHAR VARYING(2000))
- e_and_p_data.description
A remark or comment about the instance.
- instance_creator (O: CHAR VARYING(80))
- e_and_p_data.instance_creator
This is the person, company or application that created this instance. This identifies the party responsible for loading this instance.
- last_updated_by (O: CHAR VARYING(80))
- e_and_p_data.last_updated_by
This records the person or application making the update to this instance.
- preferred_flag (O: CHAR(1))
- property.preferred_flag
The flag is set to True if this instance of property is the preferred value in this data store of this type of property for the object which this property describes.
- source (O: CHAR VARYING(80))
- e_and_p_data.source
The provider of this instance, which is usually a data provider for imported/purchased data. If this instance is provided by POSC, then this attribute must be "POSC".
- activity_s (FSK, O: CHAR VARYING(19))
- process_data.activity
Defines the activity which created this instance.
Defines a foreign key to table activity.
- r_north_axis_direction (FNK, O: CHAR VARYING(80))
- pty_station_relative_location.ref_north_axis_direction
The meaning of North if "azimuth" is used as a relative coordinate.
Defines a foreign key to table r_north_axis_direction.
- represent_s (FSK, O: CHAR VARYING(19))
represent_t (O: CHAR VARYING(30))
- property.represent
This is the property that is the original for which this representation is an equivalent representation.
represent_s: Implements a foreign key to a row in one of the tables projected from entity property depending on the value of the next column (See below).
represent_t: Defines the name of the referenced table. Possible values are defined in @property.
- seismic_geometry_set_s (FSK, O: CHAR VARYING(19))
- pty_station_relative_location.seismic_geometry_set
Defines a foreign key to table geophysical_geometry_set.
Table is related to: data_collection_content, document_specification_part, @graphical_element, process_data_item, @property
Primary Key Constraint on: INSTANCE_S
Generated on Tue Jul 10 18:50:44 2001
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