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Added GeoDistance test which verifies the difference in behaviour between ARC and PLANE, causing elliptical results

This commit is contained in:
Chris Male 2012-06-16 01:34:48 +12:00 committed by Shay Banon
parent 14fc3910ff
commit 040fa2581a
1 changed files with 24 additions and 6 deletions
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30
src/test/java/org/elasticsearch/test/unit/index/search/geo/GeoDistanceTests.java
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@ -21,10 +21,13 @@ package org.elasticsearch.test.unit.index.search.geo;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.search.geo.GeoDistance;
import org.elasticsearch.index.search.geo.Point;
import org.testng.annotations.Test;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.lessThan;
/**
*/
@ -35,18 +38,33 @@ public class GeoDistanceTests {
public void testDistanceCheck() {
// Note, is within is an approximation, so, even though 0.52 is outside 50mi, we still get "true"
GeoDistance.DistanceBoundingCheck check = GeoDistance.distanceBoundingCheck(0, 0, 50, DistanceUnit.MILES);
//System.out.println("Dist: " + GeoDistance.ARC.calculate(0, 0, 0.5, 0.5, DistanceUnit.MILES));
assertThat(check.isWithin(0.5, 0.5), equalTo(true));
//System.out.println("Dist: " + GeoDistance.ARC.calculate(0, 0, 0.52, 0.52, DistanceUnit.MILES));
assertThat(check.isWithin(0.52, 0.52), equalTo(true));
//System.out.println("Dist: " + GeoDistance.ARC.calculate(0, 0, 1, 1, DistanceUnit.MILES));
assertThat(check.isWithin(1, 1), equalTo(false));
check = GeoDistance.distanceBoundingCheck(0, 179, 200, DistanceUnit.MILES);
//System.out.println("Dist: " + GeoDistance.ARC.calculate(0, 179, 0, -179, DistanceUnit.MILES));
assertThat(check.isWithin(0, -179), equalTo(true));
//System.out.println("Dist: " + GeoDistance.ARC.calculate(0, 179, 0, -178, DistanceUnit.MILES));
assertThat(check.isWithin(0, -178), equalTo(false));
}
@Test
public void testArcDistanceVsPlaneInEllipsis() {
Point centre = new Point(48.8534100, 2.3488000);
Point northernPoint = new Point(48.8801108681, 2.35152032666);
Point westernPoint = new Point(48.85265, 2.308896);
// With GeoDistance.ARC both the northern and western points are within the 4km range
assertThat(GeoDistance.ARC.calculate(centre.lat, centre.lon, northernPoint.lat,
northernPoint.lon, DistanceUnit.KILOMETERS), lessThan(4D));
assertThat(GeoDistance.ARC.calculate(centre.lat, centre.lon, westernPoint.lat,
westernPoint.lon, DistanceUnit.KILOMETERS), lessThan(4D));
// With GeoDistance.PLANE, only the northern point is within the 4km range,
// the western point is outside of the range due to the simple math it employs,
// meaning results will appear elliptical
assertThat(GeoDistance.PLANE.calculate(centre.lat, centre.lon, northernPoint.lat,
northernPoint.lon, DistanceUnit.KILOMETERS), lessThan(4D));
assertThat(GeoDistance.PLANE.calculate(centre.lat, centre.lon, westernPoint.lat,
westernPoint.lon, DistanceUnit.KILOMETERS), greaterThan(4D));
}
}