Entity ellipsoid

• A mathematical surface defined by revolving an ellipse around its minor (polar) axis and which approximates the surface of the earth without its topographic undulations.

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. 


identifier                                MU      ndt_name

                                          The identifier of an ellipsoid. 

inverse_flattening                                ndt_real4

                                          The inverse of flattening. Inverse flattening
                                          may be calculated as the length of the semimajor
                                          axis over the difference in lengths of the semimajor
                                          and semiminor axes: 1/f=a/(a-b), where 1/f is
                                          the inverse flattening, a is the length of the
                                          semimajor axis, and b is the length of the semiminor
                                          axis. 

ref_naming_system                                 ref_naming_system

                                          The naming system in which the identifier is defined.

semimajor_axis                            N       ndt_accurate_length

                                          Semimajor ellipsoid axis length, a. 

semiminor_axis                            N       ndt_accurate_length

                                          Semiminor ellipsoid axis length, b. 

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

                                          Indicates the various identifiers by which this
                                          ellipsoid is known. 

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

                                          These are the geodetic datums that are defined
                                          as using this ellipsoid. This ellipsoid, when
                                          properly positioned, defines the surface of these
                                          geodetic datums. 

End of entity ellipsoid

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