Expected behavior
For a LineString or any (small) geometry g near the poles, the best SRID returned by should return South/North Pole Lambert Azimuthal Equal Area projection.
As a result, the ST_Buffer(g,..., useSpheroid=true) that is using ST_BestSRID, is also returning wrong results.
int result = Functions.bestSRID(geomFromWKT("LINESTRING (-179.9999994 -82.42408, -157.330902 -85.0511284)", 4326));
assertEquals(Spheroid.EPSG_SOUTH_LAMBERT, result);
Actual behavior
int result = Functions.bestSRID(geomFromWKT("LINESTRING (-179.9999994 -82.42408, -157.330902 -85.0511284)", 4326))
assertEquals(Spheroid.EPSG_WORLD_MERCATOR, result);
Reproducer
src/test/java/org/apache/sedona/common/FunctionsTest2.java
package org.apache.sedona.common;
import org.apache.sedona.common.sphere.Spheroid;
import org.junit.Test;
import org.locationtech.jts.io.ParseException;
import static org.apache.sedona.common.Constructors.geomFromWKT;
import static org.junit.Assert.assertEquals;
public class FunctionsTest2 extends TestBase {
@Test
public void testBestSRIDNearSouthPole() throws ParseException {
int actualEPSG = Functions.bestSRID(geomFromWKT("LINESTRING (-179.9999994 -82.42408, -157.330902 -85.0511284)", 4326));
assertEquals(
"Expected South Pole Lambert Azimuthal Equal Area projection near the south pole", Spheroid.EPSG_SOUTH_LAMBERT, actualEPSG);
}
}
Test fails with:
java.lang.AssertionError: Expected South Pole Lambert Azimuthal Equal Area projection near the south pole
Expected :3409
Actual :3395
Environment
sedona: reproduced on 1.8.0 but bug is also on 1.8.1, 1.9.0 & master
- Apache Spark:
3.4.0
- Scala:
2.12.18
- Java: ZuluJDK 11
- OS: MacOS Tahoe 26.4.1
Expected behavior
For a LineString or any (small) geometry g near the poles, the best SRID returned by should return South/North Pole Lambert Azimuthal Equal Area projection.
As a result, the ST_Buffer(g,..., useSpheroid=true) that is using ST_BestSRID, is also returning wrong results.
Actual behavior
Reproducer
src/test/java/org/apache/sedona/common/FunctionsTest2.javaTest fails with:
Environment
sedona: reproduced on1.8.0but bug is also on1.8.1,1.9.0& master3.4.02.12.18