protected Geometry computeLine() throws GeometryException {
    Geometry world = worldGeometry();
    return world instanceof Lineal ? world : GeoUtils.polygonToLineString(world);
  }
Computes this feature as a {@link LineString} or {@link MultiLineString} in world web mercator coordinates.

@return the linestring in web mercator coordinates
@throws GeometryException         if an unexpected but recoverable error occurs creating this geometry that should
                                  be logged for debugging
@throws GeometryException.Verbose if an expected error occurs creating this geometry that will be logged at a lower
                                  log level
planetiler-core/src/main/java/com/onthegomap/planetiler/geo/WithGeometry.java