/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2011, Open Source Geospatial Foundation (OSGeo)
* (C) 2003-2005, Open Geospatial Consortium Inc.
*
* All Rights Reserved. http://www.opengis.org/legal/
*/
package org.opengis.referencing.datum;
import org.opengis.annotation.UML;
import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;
/**
* A textual description and/or a set of parameters identifying a particular reference level
* surface used as a zero-height surface. The description includes its position with respect
* to the Earth for any of the height types recognized by this standard. There are several
* types of Vertical Datums, and each may place constraints on the
* {@linkplain org.opengis.referencing.cs.CoordinateSystemAxis Coordinate Axis} with which
* it is combined to create a {@linkplain org.opengis.referencing.crs.VerticalCRS Vertical CRS}.
*
*
* @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/referencing/datum/VerticalDatum.java $
* @version <A HREF="http://portal.opengeospatial.org/files/?artifact_id=6716">Abstract specification 2.0</A>
* @author Martin Desruisseaux (IRD)
* @since GeoAPI 1.0
*/
@UML(identifier="CD_VerticalDatum", specification=ISO_19111)
public interface VerticalDatum extends Datum {
/**
* The type of this vertical datum. Default is "geoidal".
*
* @return The type of this vertical datum.
*/
@UML(identifier="vertDatumType", obligation=MANDATORY, specification=ISO_19111)
VerticalDatumType getVerticalDatumType();
}