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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) 2013
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.math.MathUtil;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
/**
* A simple spherical earth model using radius 6371009 m.
*
* @author Erich Schubert
*/
public class SphericalVincentyEarthModel extends AbstractEarthModel {
/**
* Spherical earth model, static instance.
*/
public static final SphericalVincentyEarthModel STATIC = new SphericalVincentyEarthModel();
/**
* Earth radius approximation in m.
*
* As per International Union of Geodesy and Geophysics (IUGG):
*/
public static final double EARTH_RADIUS = 6371009; // m
/**
* Constructor.
*/
protected SphericalVincentyEarthModel() {
super(EARTH_RADIUS, EARTH_RADIUS, 0., Double.POSITIVE_INFINITY);
}
@Override
public double[] latLngRadToECEF(double lat, double lng) {
// Then to sine and cosines:
final double clat = Math.cos(lat), slat = MathUtil.cosToSin(lat, clat);
final double clng = Math.cos(lng), slng = MathUtil.cosToSin(lng, clng);
return new double[] { EARTH_RADIUS * clat * clng, EARTH_RADIUS * clat * slng, EARTH_RADIUS * slat };
}
@Override
public double[] latLngRadToECEF(double lat, double lng, double h) {
// Then to sine and cosines:
final double clat = Math.cos(lat), slat = MathUtil.cosToSin(lat, clat);
final double clng = Math.cos(lng), slng = MathUtil.cosToSin(lng, clng);
return new double[] { (EARTH_RADIUS + h) * clat * clng, (EARTH_RADIUS + h) * clat * slng, (EARTH_RADIUS + h) * slat };
}
@Override
public double ecefToLatRad(double x, double y, double z) {
final double p = Math.sqrt(x * x + y * y);
return Math.atan2(z, p);
}
@Override
public double distanceRad(double lat1, double lng1, double lat2, double lng2) {
return EARTH_RADIUS * SphereUtil.sphericalVincentyFormulaRad(lat1, lng1, lat2, lng2);
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractParameterizer {
@Override
protected SphericalVincentyEarthModel makeInstance() {
return STATIC;
}
}
}
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