verticaldatumtype.java

GEo 地理操作源代码

/*$************************************************************************************************
 **
 ** $Id: VerticalDatumType.java,v 1.2 2004/05/06 22:05:53 desruisseaux Exp $
 **
 ** $Source: /cvsroot/geoapi/src/org/opengis/referencing/datum/VerticalDatumType.java,v $
 **
 ** Copyright (C) 2003 Open GIS Consortium, Inc. All Rights Reserved. http://www.opengis.org/Legal/
 **
 *************************************************************************************************/
package org.opengis.referencing.datum;

// J2SE directdependencies
import java.util.List;
import java.util.ArrayList;

// OpenGIS direct dependencies
import org.opengis.util.CodeList;


/**
 * Type of a vertical datum. 
 *
 * @UML codelist CD_VerticalDatumType
 * @author ISO 19111
 * @author <A HREF="http://www.opengis.org">OpenGIS&reg; consortium</A>
 * @version <A HREF="http://www.opengis.org/docs/03-073r1.zip">Abstract specification 2.0</A>
 */
public final class VerticalDatumType extends CodeList {
    /**
     * Serial number for compatibility with different versions.
     */
    private static final long serialVersionUID = -8161084528823937553L;

    /**
     * List of all enumerations of this type.
     * Must be declared before any enum declaration.
     */
    private static final List VALUES = new ArrayList(6);

    /**
     * In some cases, e.g. oil exploration and production, a geological feature, such as the top
     * or bottom of a geologically identifiable and meaningful subsurface layer, is used as a
     * vertical datum. Other variations to the above three vertical datum types may exist
     * and are all included in this type.
     *
     * @UML conditional other&nbsp;surface
     */
    public static final VerticalDatumType OTHER_SURFACE = new VerticalDatumType("OTHER_SURFACE");

    /**
     * The zero value of the associated vertical coordinate system axis is defined to approximate
     * a constant potential surface, usually the geoid. Such a reference surface is usually
     * determined by a national or scientific authority, and is then a well-known, named datum.
     *
     * @UML conditional geoidal
     */
    public static final VerticalDatumType GEOIDAL = new VerticalDatumType("GEOIDAL");

    /**
     * A vertical datum for ellipsoidal heights that are measured along the
     * normal to the ellipsoid used in the definition of horizontal datum.
     */
    public static final VerticalDatumType ELLIPSOIDAL = new VerticalDatumType("ELLIPSOIDAL");

    /**
     * The zero point of the vertical axis is defined by a surface that has meaning for the
     * purpose which the associated vertical measurements are used for. For hydrographic charts,
     * this is often a predicted nominal sea surface (i.e., without waves or other wind and current
     * effects) that occurs at low tide. Depths are measured in the direction perpendicular
     * (approximately) to the actual equipotential surfaces of the earth's gravity field,
     * using such procedures as echo-sounding.
     *
     * @UML conditional depth
     */
    public static final VerticalDatumType DEPTH = new VerticalDatumType("DEPTH");

    /**
     * Atmospheric pressure is the basis for the definition of the origin of the
     * associated vertical coordinate system axis. These are approximations of
     * orthometric heights obtained with the help of a barometer or a barometric
     * altimeter. These values are usually expressed in one of the following units:
     * meters, feet, millibars (used to measure pressure levels), or theta value
     * (units used to measure geopotential height).
     *
     * @UML conditional barometric
     */
    public static final VerticalDatumType BAROMETRIC = new VerticalDatumType("BAROMETRIC");

    /**
     * A vertical datum for orthometric heights that are measured along the plumb line.
     */
    public static final VerticalDatumType ORTHOMETRIC = new VerticalDatumType("ORTHOMETRIC");

    /**
     * Constructs an enum with the given name. The new enum is
     * automatically added to the list returned by {@link #values}.
     *
     * @param name The enum name. This name must not be in use by an other enum of this type.
     */
    public VerticalDatumType(final String name) {
        super(name, VALUES);
    }

    /**
     * Returns the list of <code>VerticalDatumType</code>s.
     */
    public static VerticalDatumType[] values() {
        synchronized (VALUES) {
            return (VerticalDatumType[]) VALUES.toArray(new VerticalDatumType[VALUES.size()]);
        }
    }

    /**
     * Returns the list of enumerations of the same kind than this enum.
     */
    public CodeList[] family() {
        return values();
    }
}