EngineeringCRSPropertyType ImageCRS Concrete coordinate reference systems .1 CompoundCRS

108 Copyright © 2007 Open Geospatial Consortium, Inc. All Rights Reserved. gml:ImageCRS is an engineering coordinate reference system applied to locations in images. Image coordinate reference systems are treated as a separate subtype because the definition of the associated image datum contains two attributes not relevant to other engineering datums.

12.3.3.30 affineCS

element name=affineCS type=gml:AffineCSPropertyType gml:affineCS is an association role to the affine coordinate system used by this CRS.

12.3.3.31 imageDatum

element name=imageDatum type=gml:ImageDatumPropertyType gml:imageDatum is an association role to the image datum used by this CRS.

12.3.3.32 ImageCRSPropertyType

complexType name=ImageCRSPropertyType sequence minOccurs=0 element ref=gml:ImageCRS sequence attributeGroup ref=gml:AssociationAttributeGroup complexType gml:ImageCRSPropertyType is a property type for association roles to an image coordinate reference system, either referencing or containing the definition of that reference system.

12.3.3.33 TemporalCRS

element name=TemporalCRS type=gml:TemporalCRSType substitutionGroup=gml:AbstractSingleCRS complexType name=TemporalCRSType complexContent extension base=gml:AbstractCRSType sequence choice element ref=gml:timeCS element ref=gml:usesTemporalCS choice element ref=gml:temporalDatum sequence extension complexContent complexType gml:TemporalCRS is a 1D coordinate reference system used for the recording of time.

12.3.3.34 timeCS

element name=timeCS type=gml:TimeCSPropertyType gml:timeCS is an association role to the time coordinate system used by this CRS. Copyright © 2007 Open Geospatial Consortium, Inc. All Rights Reserved. 109

12.3.3.35 temporalDatum

element name=temporalDatum type=gml:TemporalDatumPropertyType gml:temporalDatum is an association role to the temporal datum used by this CRS.

12.3.3.36 TemporalCRSPropertyType

complexType name=TemporalCRSPropertyType sequence minOccurs=0 element ref=gml:TemporalCRS sequence attributeGroup ref=gml:AssociationAttributeGroup complexType gml:TemporalCRSPropertyType is a property type for association roles to a temporal coordinate reference system, either referencing or containing the definition of that reference system.

12.4 Coordinate systems

12.4.1 Overview

The coordinate systems schema components can be divided into three logical parts, which define elements and types for XML encoding of the definitions of:  coordinate system axes;  abstract coordinate system;  multiple concrete types of spatial-temporal coordinate system. These schema components encode the Coordinate System packages of the UML Models of ISO 19111:2007, Clause 9, and D.3.9 of this International Standard. NOTE The coordinateSystems schema document includes the referenceSystems.xsd GML schema document. This schema is identified by the following location-independent name using URN syntax: urn:x-ogc:specification:gml:schema-xsd:coordinateSystems:3.2.1 12.4.2 Coordinate system axes 12.4.2.1 CoordinateSystemAxis element name=CoordinateSystemAxis type=gml:CoordinateSystemAxisType substitutionGroup=gml:Definition complexType name=CoordinateSystemAxisType complexContent extension base=gml:IdentifiedObjectType sequence element ref=gml:axisAbbrev element ref=gml:axisDirection element ref=gml:minimumValue minOccurs=0 element ref=gml:maximumValue minOccurs=0 element ref=gml:rangeMeaning minOccurs=0 sequence