@Override
  public Envelope expandEnvelope(Envelope env) {
    for (int i = 0; i < points.size(); i += dimension) {
      env.expandToInclude(points.get(i), points.get(i + 1));
    }
    return env;
  }
Returns a coordinate sequence that translates and scales coordinates on insertion.

@param relX  x origin of the translation
@param relY  y origin of the translation
@param scale amount to scale by
@return the new empty coordinate sequence
planetiler-core/src/main/java/com/onthegomap/planetiler/geo/MutableCoordinateSequence.java