The identification and definition of the starting longitude of a geographic coordinate system, which is referenced from the Greenwich Meridian.

identifier (M, K: ndt_name)

Identifier of the prime meridian.


greenwich_longitude (M: ndt_earth_angle)

Longitude of the prime meridian as reckoned from the Greenwich meridian. East longitudes are positive, west longitudes are negative.


source (M, I: ref_source)

The provider of this instance of reference information. If this instance is provided by POSC, then this attribute must be "POSC". Each prime_meridian must provided by one ref_source. Inherited from reference_behavior.


description (O: ndt_comment)

Remark about the prime meridian.


effective_date (O: ndt_date)

The effective date (usually year) of the prime meridian.


status (O, I: ndt_instance_status) (0644)

The status of this instance in the version of Epicentre running in a data store. This is an enumerated datatype for which the following are the possible values: current, provisional, deprecated. Current - use without restriction. Provisional - use with caution, this value is for comment and may not appear in future releases of Epicentre. Deprecated - avoid use if possible, it is planned to remove this value in the next major release of Epicentre. Inherited from reference_behavior.


data_collection (I, V: SET[0:?] data_collection(collection_content))

Indicates the data collections that include this instance of E and P data. Each prime_meridian may be a member of one or more data_collection. Inherited from e_and_p_data.


datum_for_ranking (I, V: SET[0:?] object_ranking(base_object))

Indicates that an object is being used as a basis for comparison with another object. Each prime_meridian may datum for ranking one or more object_ranking. Inherited from object_of_interest.


geographic_coordinate_system (V: SET[0:?] geographic_coordinate_system(prime_meridian))

These are the geographic coordinate systems that use this prime meridian. Each prime_meridian may be used to define one or more geographic_coordinate_system.


graphical_element (I, V: SET[0:?] graphical_element(depicted_object))

Specifies one or more graphical elements which are depicting this data item. Each prime_meridian may be depicted by one or more graphical_element. Inherited from e_and_p_data.


object_of_ranking (I, V: SET[0:?] object_ranking(ranked_object))

Indicates that an object is being classified in a rank order based on its characteristics. Each prime_meridian may object of ranking one or more object_ranking. Inherited from object_of_interest.


source_reference (O, I: ref_source_reference)

The reference used by source to provide the standard instance, such as Petroleum Industry Data Dictionary (PIDD), Websters Ninth New Collegiate Dictionary, etc. Each prime_meridian may documented by one ref_source_reference. Inherited from reference_behavior.


version (O, I: ref_epicentre_version) (0644)

Describes the version of Epicentre when this status was assigned to this instance of reference behavior Each prime_meridian may version one ref_epicentre_version. Inherited from reference_behavior.

Local rules:

Uniqueness Constraint
identifier
Supertype path(s):
e_and_p_data > object_of_interest > technical_object > prime_meridian.
reference_behavior > prime_meridian.

Entity projects as table PRIME_MERIDIAN.

Referenced in Diagrams:

• CS1: Coordinate Systems