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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;
}
}
}
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