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org.elasticsearch.common.geo.GeoDistance Maven / Gradle / Ivy
ElasticSearch - Open Source, Distributed, RESTful Search Engine
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch licenses this
* file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.geo;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.common.unit.DistanceUnit;
/**
* Geo distance calculation.
*/
public enum GeoDistance {
/**
* Calculates distance as points on a plane. Faster, but less accurate than {@link #ARC}.
*/
PLANE() {
@Override
public double calculate(double sourceLatitude, double sourceLongitude, double targetLatitude, double targetLongitude, DistanceUnit unit) {
double px = targetLongitude - sourceLongitude;
double py = targetLatitude - sourceLatitude;
return Math.sqrt(px * px + py * py) * unit.getDistancePerDegree();
}
@Override
public double normalize(double distance, DistanceUnit unit) {
return distance;
}
@Override
public FixedSourceDistance fixedSourceDistance(double sourceLatitude, double sourceLongitude, DistanceUnit unit) {
return new PlaneFixedSourceDistance(sourceLatitude, sourceLongitude, unit);
}
},
/**
* Calculates distance factor.
*/
FACTOR() {
@Override
public double calculate(double sourceLatitude, double sourceLongitude, double targetLatitude, double targetLongitude, DistanceUnit unit) {
double longitudeDifference = targetLongitude - sourceLongitude;
double a = Math.toRadians(90D - sourceLatitude);
double c = Math.toRadians(90D - targetLatitude);
return (Math.cos(a) * Math.cos(c)) + (Math.sin(a) * Math.sin(c) * Math.cos(Math.toRadians(longitudeDifference)));
}
@Override
public double normalize(double distance, DistanceUnit unit) {
return Math.cos(distance / unit.getEarthRadius());
}
@Override
public FixedSourceDistance fixedSourceDistance(double sourceLatitude, double sourceLongitude, DistanceUnit unit) {
return new FactorFixedSourceDistance(sourceLatitude, sourceLongitude, unit);
}
},
/**
* Calculates distance as points in a globe.
*/
ARC() {
@Override
public double calculate(double sourceLatitude, double sourceLongitude, double targetLatitude, double targetLongitude, DistanceUnit unit) {
double longitudeDifference = targetLongitude - sourceLongitude;
double a = Math.toRadians(90D - sourceLatitude);
double c = Math.toRadians(90D - targetLatitude);
double factor = (Math.cos(a) * Math.cos(c)) + (Math.sin(a) * Math.sin(c) * Math.cos(Math.toRadians(longitudeDifference)));
if (factor < -1D) {
return Math.PI * unit.getEarthRadius();
} else if (factor >= 1D) {
return 0;
} else {
return Math.acos(factor) * unit.getEarthRadius();
}
}
@Override
public double normalize(double distance, DistanceUnit unit) {
return distance;
}
@Override
public FixedSourceDistance fixedSourceDistance(double sourceLatitude, double sourceLongitude, DistanceUnit unit) {
return new ArcFixedSourceDistance(sourceLatitude, sourceLongitude, unit);
}
};
public abstract double normalize(double distance, DistanceUnit unit);
public abstract double calculate(double sourceLatitude, double sourceLongitude, double targetLatitude, double targetLongitude, DistanceUnit unit);
public abstract FixedSourceDistance fixedSourceDistance(double sourceLatitude, double sourceLongitude, DistanceUnit unit);
private static final double MIN_LAT = Math.toRadians(-90d); // -PI/2
private static final double MAX_LAT = Math.toRadians(90d); // PI/2
private static final double MIN_LON = Math.toRadians(-180d); // -PI
private static final double MAX_LON = Math.toRadians(180d); // PI
public static DistanceBoundingCheck distanceBoundingCheck(double sourceLatitude, double sourceLongitude, double distance, DistanceUnit unit) {
// angular distance in radians on a great circle
double radDist = distance / unit.getEarthRadius();
double radLat = Math.toRadians(sourceLatitude);
double radLon = Math.toRadians(sourceLongitude);
double minLat = radLat - radDist;
double maxLat = radLat + radDist;
double minLon, maxLon;
if (minLat > MIN_LAT && maxLat < MAX_LAT) {
double deltaLon = Math.asin(Math.sin(radDist) / Math.cos(radLat));
minLon = radLon - deltaLon;
if (minLon < MIN_LON) minLon += 2d * Math.PI;
maxLon = radLon + deltaLon;
if (maxLon > MAX_LON) maxLon -= 2d * Math.PI;
} else {
// a pole is within the distance
minLat = Math.max(minLat, MIN_LAT);
maxLat = Math.min(maxLat, MAX_LAT);
minLon = MIN_LON;
maxLon = MAX_LON;
}
GeoPoint topLeft = new GeoPoint(Math.toDegrees(maxLat), Math.toDegrees(minLon));
GeoPoint bottomRight = new GeoPoint(Math.toDegrees(minLat), Math.toDegrees(maxLon));
if (minLon > maxLon) {
return new Meridian180DistanceBoundingCheck(topLeft, bottomRight);
}
return new SimpleDistanceBoundingCheck(topLeft, bottomRight);
}
public static GeoDistance fromString(String s) {
if ("plane".equals(s)) {
return PLANE;
} else if ("arc".equals(s)) {
return ARC;
} else if ("factor".equals(s)) {
return FACTOR;
}
throw new ElasticSearchIllegalArgumentException("No geo distance for [" + s + "]");
}
public static interface FixedSourceDistance {
double calculate(double targetLatitude, double targetLongitude);
}
public static interface DistanceBoundingCheck {
boolean isWithin(double targetLatitude, double targetLongitude);
GeoPoint topLeft();
GeoPoint bottomRight();
}
public static AlwaysDistanceBoundingCheck ALWAYS_INSTANCE = new AlwaysDistanceBoundingCheck();
private static class AlwaysDistanceBoundingCheck implements DistanceBoundingCheck {
@Override
public boolean isWithin(double targetLatitude, double targetLongitude) {
return true;
}
@Override
public GeoPoint topLeft() {
return null;
}
@Override
public GeoPoint bottomRight() {
return null;
}
}
public static class Meridian180DistanceBoundingCheck implements DistanceBoundingCheck {
private final GeoPoint topLeft;
private final GeoPoint bottomRight;
public Meridian180DistanceBoundingCheck(GeoPoint topLeft, GeoPoint bottomRight) {
this.topLeft = topLeft;
this.bottomRight = bottomRight;
}
@Override
public boolean isWithin(double targetLatitude, double targetLongitude) {
return (targetLatitude >= bottomRight.lat() && targetLatitude <= topLeft.lat()) &&
(targetLongitude >= topLeft.lon() || targetLongitude <= bottomRight.lon());
}
@Override
public GeoPoint topLeft() {
return topLeft;
}
@Override
public GeoPoint bottomRight() {
return bottomRight;
}
}
public static class SimpleDistanceBoundingCheck implements DistanceBoundingCheck {
private final GeoPoint topLeft;
private final GeoPoint bottomRight;
public SimpleDistanceBoundingCheck(GeoPoint topLeft, GeoPoint bottomRight) {
this.topLeft = topLeft;
this.bottomRight = bottomRight;
}
@Override
public boolean isWithin(double targetLatitude, double targetLongitude) {
return (targetLatitude >= bottomRight.lat() && targetLatitude <= topLeft.lat()) &&
(targetLongitude >= topLeft.lon() && targetLongitude <= bottomRight.lon());
}
@Override
public GeoPoint topLeft() {
return topLeft;
}
@Override
public GeoPoint bottomRight() {
return bottomRight;
}
}
public static class PlaneFixedSourceDistance implements FixedSourceDistance {
private final double sourceLatitude;
private final double sourceLongitude;
private final double distancePerDegree;
public PlaneFixedSourceDistance(double sourceLatitude, double sourceLongitude, DistanceUnit unit) {
this.sourceLatitude = sourceLatitude;
this.sourceLongitude = sourceLongitude;
this.distancePerDegree = unit.getDistancePerDegree();
}
@Override
public double calculate(double targetLatitude, double targetLongitude) {
double px = targetLongitude - sourceLongitude;
double py = targetLatitude - sourceLatitude;
return Math.sqrt(px * px + py * py) * distancePerDegree;
}
}
public static class FactorFixedSourceDistance implements FixedSourceDistance {
private final double sourceLatitude;
private final double sourceLongitude;
private final double earthRadius;
private final double a;
private final double sinA;
private final double cosA;
public FactorFixedSourceDistance(double sourceLatitude, double sourceLongitude, DistanceUnit unit) {
this.sourceLatitude = sourceLatitude;
this.sourceLongitude = sourceLongitude;
this.earthRadius = unit.getEarthRadius();
this.a = Math.toRadians(90D - sourceLatitude);
this.sinA = Math.sin(a);
this.cosA = Math.cos(a);
}
@Override
public double calculate(double targetLatitude, double targetLongitude) {
double longitudeDifference = targetLongitude - sourceLongitude;
double c = Math.toRadians(90D - targetLatitude);
return (cosA * Math.cos(c)) + (sinA * Math.sin(c) * Math.cos(Math.toRadians(longitudeDifference)));
}
}
public static class ArcFixedSourceDistance implements FixedSourceDistance {
private final double sourceLatitude;
private final double sourceLongitude;
private final double earthRadius;
private final double a;
private final double sinA;
private final double cosA;
public ArcFixedSourceDistance(double sourceLatitude, double sourceLongitude, DistanceUnit unit) {
this.sourceLatitude = sourceLatitude;
this.sourceLongitude = sourceLongitude;
this.earthRadius = unit.getEarthRadius();
this.a = Math.toRadians(90D - sourceLatitude);
this.sinA = Math.sin(a);
this.cosA = Math.cos(a);
}
@Override
public double calculate(double targetLatitude, double targetLongitude) {
double longitudeDifference = targetLongitude - sourceLongitude;
double c = Math.toRadians(90D - targetLatitude);
double factor = (cosA * Math.cos(c)) + (sinA * Math.sin(c) * Math.cos(Math.toRadians(longitudeDifference)));
if (factor < -1D) {
return Math.PI * earthRadius;
} else if (factor >= 1D) {
return 0;
} else {
return Math.acos(factor) * earthRadius;
}
}
}
}
