Entity prime_meridian

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

Attribute                                 Flags   Data Type

From reference_behavior:
   source_reference                       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. 

   source                                 MI      ref_source

                                          The provider of this instance of reference information.
                                          If this instance is provided by POSC, then this
                                          attribute must be "POSC". 


From technical_object:
   data_collection                        IV      set[0 .. N] of (data_collection)

                                          Indicates the data collections that include this
                                          instance of E and P data. 

   graphical_element                      IV      set[0 .. N] of (graphical_element)

                                          Specifies one or more graphical elements which
                                          are depicting this data item. 

   datum_for_ranking                      IV      set[0 .. N] of (object_ranking)

                                          Indicates that an object is being used as a basis
                                          for comparison with another object. 

   object_of_ranking                      IV      set[0 .. N] of (object_ranking)

                                          Indicates that an object is being classified in
                                          a rank order based on its characteristics. 


description                                       ndt_comment

                                          Remark about the prime meridian. 

effective_date                            N       ndt_date

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

greenwich_longitude                       MN      ndt_earth_angle

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

identifier                                MU      ndt_name

                                          Identifier of the prime meridian. 

geographic_coordinate_system              V       set[0 .. N] of (geographic_coordinate_system)

                                          These are the geographic coordinate systems that
                                          use this prime meridian. 

End of entity prime_meridian

M - mandatory, U - unique, I - inherited, V - inverse, N - named type