gml:_CoordinateReferenceSystem

A coordinate reference system consists of an ordered sequence of coordinate system axes that are related to the earth through a datum. A coordinate reference system is defined by one datum and by one coordinate system. Most coordinate reference system do not move relative to the earth, except for engineering coordinate reference systems defined on moving platforms such as cars, ships, aircraft, and spacecraft. For further information, see OGC Abstract Specification Topic 2.

Coordinate reference systems are commonly divided into sub-types. The common classification criterion for sub-typing of coordinate reference systems is the way in which they deal with earth curvature. This has a direct effect on the portion of the earth's surface that can be covered by that type of CRS with an acceptable degree of error. The exception to the rule is the subtype "Temporal" which has been added by analogy. 

Element information

Content

• Sequence [1..1]
  from type gml:AbstractReferenceSystemBaseType
  gml:metaDataProperty [0..*]    Contains or refers to a metadata package that contains metadata properties.
  gml:srsName [1..1]    The name by which this reference system is identified.
  1. gml:srsID [0..*]    Set of alterative identifications of this reference system. The first srsID, if any, is normally the primary identification code, and any others are aliases.
  2. gml:remarks [0..1]    Comments on or information about this reference system, including source information.
  3. gml:validArea [0..1]    Area or region in which this CRS object is valid.
  4. gml:scope [0..1]    Description of domain of usage, or limitations of usage, for which this CRS object is valid.

Attributes

Used in

• Group gml:Value
• Type gml:ReferenceSystemRefType (Element gml:referenceSystemRef)
• Type gmx:CT_CRS_PropertyType (Element gmx:crs)
• Type gsr:SC_CRS_PropertyType (Element gmd:CRS)
• Type gml:AssociationType (Elements gml:_association, gml:member)
• Type gml:DictionaryEntryType (Elements gml:dictionaryEntry, gml:definitionMember)
• Type gml:ValueArrayPropertyType via reference to gml:Value (Element gml:valueComponents)
• Type gml:CRSRefType (Elements gml:sourceCRS, gml:targetCRS, gml:crsRef)
• Type gml:CoordinateReferenceSystemRefType (Elements gml:coordinateReferenceSystemRef, gml:includesCRS, gml:baseCRS)
• Type gml:ValuePropertyType via reference to gml:Value (Elements gml:valueProperty, gml:valueComponent)

Substitution hierarchy

• gml:_Object
  • can be substituted with gml:_GML
    • can be substituted with gml:Definition
      • can be substituted with gml:_ReferenceSystem
        • can be substituted with gml:_CRS
          • can be substituted with gml:_CoordinateReferenceSystem
            • can be substituted with gml:GeographicCRS
              • can be substituted with gmx:ML_GeographicCRS
            • can be substituted with gml:VerticalCRS
              • can be substituted with gmx:ML_VerticalCRS
            • can be substituted with gml:GeocentricCRS
              • can be substituted with gmx:ML_GeocentricCRS
            • can be substituted with gml:_GeneralDerivedCRS
              • can be substituted with gml:ProjectedCRS
                • can be substituted with gmx:ML_ProjectedCRS
              • can be substituted with gml:DerivedCRS
                • can be substituted with gmx:ML_DerivedCRS
            • can be substituted with gml:EngineeringCRS
              • can be substituted with gmx:ML_EngineeringCRS
            • can be substituted with gml:ImageCRS
              • can be substituted with gmx:ML_ImageCRS
            • can be substituted with gml:TemporalCRS
              • can be substituted with gmx:ML_TemporalCRS