org.opengis.referencing.crs

Interface VerticalCRS

All Superinterfaces:

CoordinateReferenceSystem, IdentifiedObject, ReferenceSystem, SingleCRS

All Known Implementing Classes:

DefaultVerticalCRS

@UML(identifier="SC_VerticalCRS",
     specification=ISO_19111)
public interface VerticalCRS
extends SingleCRS

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 inseparable part of a 3D coordinate tuple defined in a geographic 3D coordinate reference system. However GeoAPI does not enforce this rule. Some applications may relax this rule and accept ellipsoidal heights in the following context:

• As a transient state while parsing Well Known Text, or any other format based on legacy specifications where ellipsoidal heights were allowed as an independant axis.

• As short-lived objects to be passed or returned by methods enforcing type safety, for example VerticalExtent.getVerticalCRS().

• Other cases at implementor convenience. However implementors are encouraged to assemble the full 3D CRS as soon as they can.

Used with CS type(s)
Vertical

Since:

GeoAPI 1.0

Author:

Martin Desruisseaux (IRD)

Field Summary

Fields inherited from interface ReferenceSystem

DOMAIN_OF_VALIDITY_KEY, SCOPE_KEY

Fields inherited from interface IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Method Summary

Modifier and Type	Method and Description
VerticalCS	getCoordinateSystem() Returns the coordinate system, which must be vertical.
VerticalDatum	getDatum() Returns the datum, which must be vertical.

Methods inherited from interface ReferenceSystem

getDomainOfValidity, getScope

Methods inherited from interface IdentifiedObject

getAlias, getIdentifiers, getName, getRemarks, toWKT

Method Detail

getCoordinateSystem

@UML(identifier="usesCS",
     obligation=MANDATORY,
     specification=ISO_19111)
VerticalCS getCoordinateSystem()

Returns the coordinate system, which must be vertical.

Specified by:

getCoordinateSystem in interface CoordinateReferenceSystem

Specified by:

getCoordinateSystem in interface SingleCRS

Returns:

The coordinate system.

getDatum

@UML(identifier="usesDatum",
     obligation=MANDATORY,
     specification=ISO_19111)
VerticalDatum getDatum()

Returns the datum, which must be vertical.

Specified by:

getDatum in interface SingleCRS

Returns:

The datum.