GeodeticCRSPropertyType VerticalCRS Concrete coordinate reference systems .1 CompoundCRS

104 Copyright © 2007 Open Geospatial Consortium, Inc. All Rights Reserved. complexContent complexType gml:VerticalCRS is a 1D coordinate reference system used for recording heights or depths. Vertical CRSs make use of the direction of gravity to define the concept of height or depth, but the relationship with gravity may not be straightforward. By implication, ellipsoidal heights h cannot be captured in a vertical coordinate reference system. Ellipsoidal heights cannot exist independently, but only as an inseparable part of a 3D coordinate tuple defined in a geographic 3D coordinate reference system.

12.3.3.11 verticalCS

element name=verticalCS type=gml:VerticalCSPropertyType gml:verticalCS is an association role to the vertical coordinate system used by this CRS.

12.3.3.12 verticalDatum

element name=verticalDatum type=gml:VerticalDatumPropertyType gml:verticalDatum is an association role to the vertical datum used by this CRS.

12.3.3.13 VerticalCRSPropertyType

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

12.3.3.14 ProjectedCRS

element name=ProjectedCRS type=gml:ProjectedCRSType substitutionGroup=gml:AbstractGeneralDerivedCRS complexType name=ProjectedCRSType complexContent extension base=gml:AbstractGeneralDerivedCRSType sequence choice element ref=gml:baseGeodeticCRS element ref=gml:baseGeographicCRS choice element ref=gml:cartesianCS sequence extension complexContent complexType gml:ProjectedCRS is a 2D coordinate reference system used to approximate the shape of the Earth on a planar surface, but in such a way that the distortion that is inherent to the approximation is carefully controlled and known. Distortion correction is commonly applied to calculated bearings and distances to produce values that are a close match to actual field values. Copyright © 2007 Open Geospatial Consortium, Inc. All Rights Reserved. 105

12.3.3.15 baseGeodeticCRS

element name=baseGeodeticCRS type=gml:GeodeticCRSPropertyType gml:baseGeodeticCRS is an association role to the geodetic coordinate reference system used by this projected CRS.

12.3.3.16 ProjectedCRSPropertyType

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

12.3.3.17 DerivedCRS

element name=DerivedCRS type=gml:DerivedCRSType substitutionGroup=gml:AbstractGeneralDerivedCRS complexType name=DerivedCRSType complexContent extension base=gml:AbstractGeneralDerivedCRSType sequence element ref=gml:baseCRS element ref=gml:derivedCRSType element ref=gml:coordinateSystem sequence extension complexContent complexType gml:DerivedCRS is a single coordinate reference system that is defined by its coordinate conversion from another single coordinate reference system known as the base CRS. The base CRS can be a projected coordinate reference system, if this DerivedCRS is used for a georectified grid coverage as described in ISO 19123:2005, Clause 8.

12.3.3.18 baseCRS

element name=baseCRS type=gml:SingleCRSPropertyType gml:baseCRS is an association role to the coordinate reference system used by this derived CRS.

12.3.3.19 derivedCRSType

element name=derivedCRSType type=gml:CodeWithAuthorityType The gml:derivedCRSType property describes the type of a derived coordinate reference system. The required codeSpace attribute shall reference a source of information specifying the values and meanings of all the allowed string values for this property.