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.

identifier (M, K: ndt_name)

The identifier of an ellipsoid.


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 ellipsoid must provided by one ref_source. Inherited from reference_behavior.


description (O: ndt_comment) (1029)

A description of the elipsoid.


inverse_flattening (O: 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.


semimajor_axis (O: ndt_accurate_length)

Semimajor ellipsoid axis length, a.


semiminor_axis (O: ndt_accurate_length)

Semiminor ellipsoid axis length, b.


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 ellipsoid 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 ellipsoid may datum for ranking one or more object_ranking. Inherited from object_of_interest.


ellipsoid_alias (V: SET[0:?] ellipsoid_alias(ellipsoid))

Indicates the various identifiers by which this ellipsoid is known. Each ellipsoid may be known as one or more ellipsoid_alias.


geodetic_datum (V: SET[0:?] geodetic_datum(ellipsoid))

These are the geodetic datums that are defined as using this ellipsoid. This ellipsoid, when properly positioned, defines the surface of these geodetic datums. Each ellipsoid may be used to define one or more geodetic_datum.


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

Specifies one or more graphical elements which are depicting this data item. Each ellipsoid 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 ellipsoid may object of ranking one or more object_ranking. Inherited from object_of_interest.


ref_naming_system (O: ref_naming_system)

The naming system in which the identifier is defined.


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 ellipsoid 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 ellipsoid may version one ref_epicentre_version. Inherited from reference_behavior.

Local rules:

Uniqueness Constraint
identifier
Instance Value Constraint
Whenever a SEMIMAJOR AXIS is defined for an ELLIPSOID, then one of INVERSE FLATT ENING or SEMIMINOR AXIS must also be defined.
Supertype path(s):
e_and_p_data > object_of_interest > technical_object > ellipsoid.
reference_behavior > ellipsoid.

Entity projects as table ELLIPSOID.

Referenced in Diagrams:

• CS1: Coordinate Systems
• HL4: Object Aliasing