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Diffstat (limited to 'elki/src/main/java/de/lmu/ifi/dbs/elki/math/geodesy/WGS84SpheroidEarthModel.java')
-rw-r--r-- | elki/src/main/java/de/lmu/ifi/dbs/elki/math/geodesy/WGS84SpheroidEarthModel.java | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/math/geodesy/WGS84SpheroidEarthModel.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/math/geodesy/WGS84SpheroidEarthModel.java new file mode 100644 index 00000000..522e769a --- /dev/null +++ b/elki/src/main/java/de/lmu/ifi/dbs/elki/math/geodesy/WGS84SpheroidEarthModel.java @@ -0,0 +1,86 @@ +package de.lmu.ifi.dbs.elki.math.geodesy; + +/* + This file is part of ELKI: + Environment for Developing KDD-Applications Supported by Index-Structures + + Copyright (C) 2015 + Ludwig-Maximilians-Universität München + Lehr- und Forschungseinheit für Datenbanksysteme + ELKI Development Team + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published by + the Free Software Foundation, either version 3 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 Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +import de.lmu.ifi.dbs.elki.utilities.Alias; +import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer; + +/** + * The WGS84 spheroid earth model, without height model (so not a geoid, just a + * spheroid!) + * + * Note that EGM96 uses the same spheroid, but what really makes the difference + * is it's geoid expansion. + * + * Radius: 6378137.0 m + * + * Flattening: 1 / 298.257223563 + * + * @author Erich Schubert + * + * @apiviz.landmark + */ +@Alias({ "WGS-84", "WGS84" }) +public class WGS84SpheroidEarthModel extends AbstractEarthModel { + /** + * Static instance. + */ + public static final WGS84SpheroidEarthModel STATIC = new WGS84SpheroidEarthModel(); + + /** + * Radius of the WGS84 Ellipsoid in m (a). + */ + public static final double WGS84_RADIUS = 6378137.0; // m + + /** + * Inverse flattening 1/f of the WGS84 Ellipsoid. + */ + public static final double WGS84_INV_FLATTENING = 298.257223563; + + /** + * Flattening f of the WGS84 Ellipsoid. + */ + public static final double WGS84_FLATTENING = 1 / WGS84_INV_FLATTENING; + + /** + * Constructor. + */ + protected WGS84SpheroidEarthModel() { + super(WGS84_RADIUS, WGS84_RADIUS * (1 - WGS84_FLATTENING), WGS84_FLATTENING, WGS84_INV_FLATTENING); + } + + /** + * Parameterization class. + * + * @author Erich Schubert + * + * @apiviz.exclude + */ + public static class Parameterizer extends AbstractParameterizer { + @Override + protected WGS84SpheroidEarthModel makeInstance() { + return STATIC; + } + } +} |