code: public static Point2D gridToWorld( GridGeometry2D gridGeometry, int x, int y )
              throws InvalidGridGeometryException, TransformException {
          final Point2D worldPosition = new Point2D.Double(x, y);
          gridGeometry.getGridToCRS2D().transform(worldPosition, worldPosition);
          return worldPosition;
      }
docs: Utility to tranform row/col to easting/westing.
  
  @param gridGeometry
  @param x
  @param y
  @return the world easting and northing.
  @throws InvalidGridGeometryException
  @throws TransformException