code: public double[] positionAt( int col, int row ) {
          if (isInRaster(col, row)) {
              GridGeometry2D gridGeometry = getGridGeometry();
              Coordinate coordinate = CoverageUtilities.coordinateFromColRow(col, row, gridGeometry);
              return new double[]{coordinate.x, coordinate.y};
          }
          return null;
      }
docs: Get world position from col, row.
  
  @param col
  @param row
  @return the [x, y] position or <code>null</code> if outside the bounds.