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The development community in building GIS solutions is sustaining an enormous level of effort. The GeoAPI project aims to reduce duplication and increase interoperability by providing neutral, interface-only APIs derived from OGC/ISO Standards.

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/*
 *    GeoAPI - Java interfaces for OGC/ISO standards
 *    http://www.geoapi.org
 *
 *    Copyright (C) 2004-2011 Open Geospatial Consortium, Inc.
 *    All Rights Reserved. http://www.opengeospatial.org/ogc/legal
 *
 *    Permission to use, copy, and modify this software and its documentation, with
 *    or without modification, for any purpose and without fee or royalty is hereby
 *    granted, provided that you include the following on ALL copies of the software
 *    and documentation or portions thereof, including modifications, that you make:
 *
 *    1. The full text of this NOTICE in a location viewable to users of the
 *       redistributed or derivative work.
 *    2. Notice of any changes or modifications to the OGC files, including the
 *       date changes were made.
 *
 *    THIS SOFTWARE AND DOCUMENTATION IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE
 *    NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 *    TO, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT
 *    THE USE OF THE SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
 *    PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
 *
 *    COPYRIGHT HOLDERS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL OR
 *    CONSEQUENTIAL DAMAGES ARISING OUT OF ANY USE OF THE SOFTWARE OR DOCUMENTATION.
 *
 *    The name and trademarks of copyright holders may NOT be used in advertising or
 *    publicity pertaining to the software without specific, written prior permission.
 *    Title to copyright in this software and any associated documentation will at all
 *    times remain with copyright holders.
 */
package org.opengis.metadata.extent;

import org.opengis.referencing.crs.VerticalCRS;
import org.opengis.annotation.UML;

import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;


/**
 * Vertical domain of dataset.
 *
 * @author  Martin Desruisseaux (IRD)
 * @author  Cory Horner (Refractions Research)
 * @version 3.0
 * @since   1.0
 *
 * @navassoc 1 - - VerticalCRS
 */
@UML(identifier="EX_VerticalExtent", specification=ISO_19115)
public interface VerticalExtent {
    /**
     * Returns the lowest vertical extent contained in the dataset.
     *
     * @return Double mandatory for valid content, may be null for an invalid document.
     */
    @UML(identifier="minimumValue", obligation=MANDATORY, specification=ISO_19115)
    Double getMinimumValue();

    /**
     * Returns the highest vertical extent contained in the dataset.
     *
     * @return Double mandatory for valid content, may be null for an invalid document.
     */
    @UML(identifier="maximumValue", obligation=MANDATORY, specification=ISO_19115)
    Double getMaximumValue();

    /**
     * Provides information about the vertical coordinate reference system to
     * which the maximum and minimum elevation values are measured. The CRS
     * identification includes unit of measure.
     *
     * @return The vertical CRS.
     *
     * @departure integration
     *   ISO 19115 specifies a generic CoordinateReferenceSystem instead than the more
     *   restrictive VerticalCRS. GeoAPI uses the more specific type for type-safety and
     *   consistency with VerticalExtent usage. However this restriction prevents usage
     *   of Height above the ellipsoid when only the constants defined in the
     *   VerticalDatumType code list are used. If such height is wanted, implementors
     *   need to extend the above code list with their own ELLIPSOIDAL constant.
     *
     * @issue http://jira.codehaus.org/browse/GEO-134
     *
     * @since 2.1
     */
    @UML(identifier="verticalCRS", obligation=MANDATORY, specification=ISO_19115)
    VerticalCRS getVerticalCRS();
}




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