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package de.lmu.ifi.dbs.elki.distance.distancefunction.geo;
/*
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.data.NumberVector;
import de.lmu.ifi.dbs.elki.data.spatial.SpatialComparable;
import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
import de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractSpatialDistanceFunction;
import de.lmu.ifi.dbs.elki.math.geodesy.EarthModel;
import de.lmu.ifi.dbs.elki.math.geodesy.SphericalVincentyEarthModel;
import de.lmu.ifi.dbs.elki.utilities.documentation.Reference;
import de.lmu.ifi.dbs.elki.utilities.exceptions.NotImplementedException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.ObjectParameter;
/**
* Distance function for 2D vectors in Latitude, Longitude form.
*
* The input data must be in degrees (not radians), and the output distance will
* be in meters (see {@link EarthModel#distanceDeg}).
*
* This implementation allows index accelerated queries using R*-trees (by
* providing a point-to-rectangle minimum distance), as published in:
* <p>
* Erich Schubert, Arthur Zimek and Hans-Peter Kriegel<br />
* Geodetic Distance Queries on R-Trees for Indexing Geographic Data<br />
* Advances in Spatial and Temporal Databases - 13th International Symposium,
* SSTD 2013, Munich, Germany
* </p>
*
* @author Erich Schubert
*
* @apiviz.composedOf EarthModel
*/
public class LatLngDistanceFunction extends AbstractSpatialDistanceFunction {
/**
* Earth model to use.
*/
private EarthModel model;
/**
* Constructor.
*/
public LatLngDistanceFunction(EarthModel model) {
super();
this.model = model;
}
@Override
public double distance(NumberVector o1, NumberVector o2) {
return model.distanceDeg(o1.doubleValue(0), o1.doubleValue(1), o2.doubleValue(0), o2.doubleValue(1));
}
@Override
@Reference(authors = "Erich Schubert, Arthur Zimek and Hans-Peter Kriegel", title = "Geodetic Distance Queries on R-Trees for Indexing Geographic Data", booktitle = "Advances in Spatial and Temporal Databases - 13th International Symposium, SSTD 2013, Munich, Germany")
public double minDist(SpatialComparable mbr1, SpatialComparable mbr2) {
if(mbr1 instanceof NumberVector) {
if(mbr2 instanceof NumberVector) {
return distance((NumberVector) mbr1, (NumberVector) mbr2);
}
else {
NumberVector o1 = (NumberVector) mbr1;
return model.minDistDeg(o1.doubleValue(0), o1.doubleValue(1), mbr2.getMin(0), mbr2.getMin(1), mbr2.getMax(0), mbr2.getMax(1));
}
}
else {
if(mbr2 instanceof NumberVector) {
NumberVector o2 = (NumberVector) mbr2;
return model.minDistDeg(o2.doubleValue(0), o2.doubleValue(1), mbr1.getMin(0), mbr1.getMin(1), mbr1.getMax(0), mbr1.getMax(1));
}
else {
throw new NotImplementedException("This distance function cannot - yet - be used with this algorithm, as the lower bound rectangle to rectangle distances have not yet been formalized for geodetic data.");
}
}
}
@Override
public SimpleTypeInformation<? super NumberVector> getInputTypeRestriction() {
return TypeUtil.NUMBER_VECTOR_FIELD_2D;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((model == null) ? 0 : model.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if(this == obj) {
return true;
}
if(obj == null) {
return false;
}
if(getClass() != obj.getClass()) {
return false;
}
LatLngDistanceFunction other = (LatLngDistanceFunction) obj;
if(model == null) {
if(other.model != null) {
return false;
}
}
else if(!model.equals(other.model)) {
return false;
}
return true;
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractParameterizer {
/**
* Earth model used.
*/
EarthModel model;
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
ObjectParameter<EarthModel> modelP = new ObjectParameter<>(EarthModel.MODEL_ID, EarthModel.class, SphericalVincentyEarthModel.class);
if(config.grab(modelP)) {
model = modelP.instantiateClass(config);
}
}
@Override
protected LatLngDistanceFunction makeInstance() {
return new LatLngDistanceFunction(model);
}
}
}
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