POSC Specifications: Epicentre Version 3.0 | Logical Data Model |
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.
- seismic_geometry_set (O, K: seismic_geometry_set(pty_station_relative_location))
- Each pty_station_relative_location may be a property of one seismic_geometry_set.
- activity (O, K, I: activity(process_data))
- Defines the activity which created this instance. Each pty_station_relative_location may be the result of one activity. Inherited from process_data.
- data_value (M: ndt_station_relative_location_array)
- The relative location information at each relevant node of the seismic station uid grid.
- description (O, I: ndt_comment) (C117)
- A remark or comment about the instance. Inherited from e_and_p_data.
- instance_create_date (O, I: ndt_date_tod) (C126)
- 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. Inherited from e_and_p_data.
- instance_creator (O, I: ndt_identifier) (C126)
- This is the person, company or application that created this instance. This identifies the party responsible for loading this instance. Inherited from e_and_p_data.
- last_updated (O, I: ndt_date_tod) (C126)
- 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). Inherited from e_and_p_data.
- last_updated_by (O, I: ndt_identifier) (C126)
- This records the person or application making the update to this instance. Inherited from e_and_p_data.
- preferred_flag (O, I: ndt_boolean)
- 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. Inherited from property.
- source (O, I: ndt_identifier) (C126)
- 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". Inherited from e_and_p_data.
- data_collection (I, V: SET[0:?] data_collection_content(collection_part)) (C020)
- Indicates the data collections that include this instance of E and P data. Each pty_station_relative_location may be a member of one or more data_collection_content. Inherited from e_and_p_data.
- document_information_content (I, V: SET[0:?] document_information_content(e_and_p_data)) (C136)
- These are the document specification parts that include this data value and define its meaning within a document specification. Each use may define a different meaning, and many uses are allowed. Each pty_station_relative_location may be included in one or more document_information_content. Inherited from e_and_p_data.
- graphical_element (I, V: SET[0:?] graphical_element(depicted_object))
- Specifies one or more graphical elements which are depicting this data item. Each pty_station_relative_location may be depicted by one or more graphical_element. Inherited from e_and_p_data.
- process_data_item (I, V: SET[0:?] process_data_item(process_data))
- Defines where this data was used by an activity. Each pty_station_relative_location may be the value for one or more process_data_item. Inherited from process_data.
- ref_north_axis_direction (O: ref_north_axis_direction(pty_station_relative_location)) (C138)
- The meaning of North if "azimuth" is used as a relative coordinate. Each pty_station_relative_location may have an orientation relative to one ref_north_axis_direction.
- represent (O, I: property(representations)) (C125)
- This is the property that is the original for which this representation is an equivalent representation. Each pty_station_relative_location may be an equivalent representation of one property. Inherited from property.
- representations (I, V: SET[0:?] property(represent)) (C125)
- This designates other properties that are stated to be equivalent representations of this property representation, such as the same geometry using another coordinate system. Each pty_station_relative_location may have as equivalent representations one or more property. Inherited from property.
Local rules:
Supertype path(s):
Generated on Tue Jul 10 15:50:46 2001
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