On the point selection page you specify the number of points and their location.
If you chose to extract the components as scalars, the points are extracted in the coordinates that you specify in the list on this page.
If you chose to extract some of the items as vectors, the points are not extracted in the exact coordinate that is specified in the list on this page, but in the points in between the grid points of the original file. e.g if you specified that you want ex. the magnitude and direction in the coordinates P on Figure 4.1, you will get the magnitude and direction in the points u, v and w. On a staggered grid, that is.
Figure 4.1 Extraction of vectors
NOTE: In the present version you can only select point at the exact grid points, i.e. the tool cannot do any spatial interpolation
