code: @Pure
  	public static Point2d L2_EL2(double x, double y) {
  		return new Point2d(x, y - (LAMBERT_2E_YS - LAMBERT_2_YS));
  	}
docs: This function convert France Lambert II coordinate to
  extended France Lambert II coordinate.
  
  @param x is the coordinate in France Lambert II
  @param y is the coordinate in France Lambert II
  @return the extended France Lambert II coordinate.