ThomasDekeyser opened a new issue, #2901:
URL: https://github.com/apache/sedona/issues/2901
## 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`
```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
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