Application: gvSIG desktop » gvSIG projections

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2018 gvSIG Association.

 * 

 * This file has been adapted from GeoAPI, see 

 * the original copyright headers bellow.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 * 

 * ----------

 * 

 *    GeoAPI - Java interfaces for OGC/ISO standards

 *    http://www.geoapi.org

 *

 *    Copyright (C) 2004-2017 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

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 *    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

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 *    COPYRIGHT HOLDERS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL OR

 *    CONSEQUENTIAL DAMAGES ARISING OUT OF ANY USE OF THE SOFTWARE OR DOCUMENTATION.

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 */

package org.gvsig.proj.catalogue.datum;

/**

 * Type of a vertical datum.

 */

public enum VerticalDatumType {

    /**

     * In some cases, for example 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.

     */

    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.

     */

    GEOIDAL,

    /**

     * 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.

     */

    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).

     */

    BAROMETRIC,

    /**

     * The zero point of the associated vertical coordinate system axis is defined

     * by the ellipsoid of the associated horizontal CRS.

     * 

     * Note: ISO 19111 ommits the definition of an ELLIPSOIDAL vertical height on intend.

     * GeographicCRS with ellipsoidal height shall be backed by a three-dimensional

     * EllipsoidalCS; they should never be built as CompoundCRS. If nevertheless an

     * ellipsoidal height is needed (for example in order to process a CRS in the WKT

     * format), implementors can get a suitable vertical datum type using

     * VerticalDatumType.valueOf("ELLIPSOIDAL"). Implementors are encouraged to not

     * expose that datum type in public API however.

     */

        ELLIPSOIDAL;

}