gml:Conversion

gml:Conversion is a concrete operation on coordinates that does not include any change of Datum. The best-known example of a coordinate conversion is a map projection. The parameters describing coordinate conversions are defined rather than empirically derived. Note that some conversions have no parameters.
This concrete complex type can be used without using a GML Application Schema that defines operation-method-specialized element names and contents, especially for methods with only one Conversion instance.
The usesValue property elements are an unordered list of composition associations to the set of parameter values used by this conversion operation.

Element information

Content

• Sequence [1..1]
  from type gml:AbstractGeneralConversionType
  gml:metaDataProperty [0..*]    deprecated
  gml:description [0..1]    The value of this property is a text description of the object. gml:description uses gml:StringOrRefType as its content model, so it may contain a simple text string content, or carry a reference to an external description. The use of gml:description to reference an external description has been deprecated and replaced by the gml:descriptionReference property.
  gml:descriptionReference [0..1]    The value of this property is a remote text description of the object. The xlink:href attribute of the gml:descriptionReference property references the external description.
  gml:identifier [1..1]    Often, a special identifier is assigned to an object by the maintaining authority with the intention that it is used in references to the object For such cases, the codeSpace shall be provided. That identifier is usually unique either globally or within an application domain. gml:identifier is a pre-defined property for such identifiers.
  gml:name [0..*]    The gml:name property provides a label or identifier for the object, commonly a descriptive name. An object may have several names, typically assigned by different authorities. gml:name uses the gml:CodeType content model. The authority for a name is indicated by the value of its (optional) codeSpace attribute. The name may or may not be unique, as determined by the rules of the organization responsible for the codeSpace. In common usage there will be one name per authority, so a processing application may select the name from its preferred codeSpace.
  gml:remarks [0..1]    
  gml:domainOfValidity [0..1]    The gml:domainOfValidity property implements an association role to an EX_Extent object as encoded in ISO/TS 19139, either referencing or containing the definition of that extent.
  gml:scope [1..*]    The gml:scope property provides a description of the usage, or limitations of usage, for which this CRS-related object is valid. If unknown, enter "not known".
  gml:coordinateOperationAccuracy [0..*]    gml:coordinateOperationAccuracy is an association role to a DQ_PositionalAccuracy object as encoded in ISO/TS 19139, either referencing or containing the definition of that positional accuracy. That object contains an estimate of the impact of this coordinate operation on point accuracy. That is, it gives position error estimates for the target coordinates of this coordinate operation, assuming no errors in the source coordinates.
  1. Choice [1..1]
     from subst. group gml:method
     gml:method    gml:method is an association role to the operation method used by a coordinate operation.
     gml:usesMethod    deprecated
  2. Choice [0..*]
     from subst. group gml:parameterValue
     gml:parameterValue    gml:parameterValue is a composition association to a parameter value or group of parameter values used by a coordinate operation.
     gml:usesValue    deprecated
     gml:includesValue    deprecated

Attributes

Substitution hierarchy

• gml:AbstractObject
  • can be substituted with gml:AbstractGML
    • can be substituted with gml:Definition
      • can be substituted with gml:AbstractCoordinateOperation
        • can be substituted with gml:AbstractSingleOperation
          • can be substituted with gml:AbstractOperation
            • can be substituted with gml:AbstractGeneralConversion
              • can be substituted with gml:Conversion

Sample instance

<gml:Conversion gml:id="ID">
   <gml:metaDataProperty>
      <gml:GenericMetaData>Any text, intermingled with:
         <!--any element-->
      </gml:GenericMetaData>
   </gml:metaDataProperty>
   <gml:description>string</gml:description>
   <gml:descriptionReference/>
   <gml:identifier codeSpace="http://www.example.com/">string</gml:identifier>
   <gml:name>string</gml:name>
   <gml:remarks>string</gml:remarks>
   <gml:domainOfValidity>
      <gmd:EX_Extent>
         <gmd:description>...
         </gmd:description>
         <gmd:geographicElement>...
         </gmd:geographicElement>
         <gmd:temporalElement>...
         </gmd:temporalElement>
         <gmd:verticalElement>...
         </gmd:verticalElement>
      </gmd:EX_Extent>
   </gml:domainOfValidity>
   <gml:scope>string</gml:scope>
   <gml:coordinateOperationAccuracy>
      <gmd:DQ_RelativeInternalPositionalAccuracy>
         <gmd:nameOfMeasure>...
         </gmd:nameOfMeasure>
         <gmd:measureIdentification>...
         </gmd:measureIdentification>
         <gmd:measureDescription>...
         </gmd:measureDescription>
         <gmd:evaluationMethodType>...
         </gmd:evaluationMethodType>
         <gmd:evaluationMethodDescription>...
         </gmd:evaluationMethodDescription>
         <gmd:evaluationProcedure>...
         </gmd:evaluationProcedure>
         <gmd:dateTime>...
         </gmd:dateTime>
         <gmd:result>...
         </gmd:result>
      </gmd:DQ_RelativeInternalPositionalAccuracy>
   </gml:coordinateOperationAccuracy>
   <gml:method>
      <gml:OperationMethod gml:id="ID">
         <gml:metaDataProperty>...
         </gml:metaDataProperty>
         <gml:description>string</gml:description>
         <gml:descriptionReference/>
         <gml:identifier codeSpace="http://www.example.com/">string</gml:identifier>
         <gml:name>string</gml:name>
         <gml:remarks>string</gml:remarks>
         <gml:formulaCitation>...
         </gml:formulaCitation>
         <gml:sourceDimensions>1</gml:sourceDimensions>
         <gml:targetDimensions>1</gml:targetDimensions>
         <gml:parameter>...
         </gml:parameter>
      </gml:OperationMethod>
   </gml:method>
   <gml:parameterValue>
      <gml:ParameterValue>
         <gml:value uom="">1.0</gml:value>
         <gml:operationParameter>...
         </gml:operationParameter>
      </gml:ParameterValue>
   </gml:parameterValue>
</gml:Conversion>