public CoordinateXY firstCoordinate() {
      if (commands.length < 3) {
        return null;
      }
      double factor = 1 << scale;
      double x = zigZagDecode(commands[1]) * SIZE / EXTENT / factor;
      double y = zigZagDecode(commands[2]) * SIZE / EXTENT / factor;
      return new CoordinateXY(x, y);
    }
Returns the coordinate of the first point in this geometry in tile pixel coordinates from (0,0) at the top left
to (256,256) at the bottom right.
planetiler-core/src/main/java/com/onthegomap/planetiler/VectorTile.java