The order extent types of the “map sheet” kind are easy to use. When this order extent has been activated by clicking on the button , the different sheets are represented in the map window :

With a click on the button , the choices are validated and the system searches the corresponding map sheet names in the database. The result is shown graphically in the map in form of red transparent map sheets, and alphanumerically as sheet names in the drop-down list on the lower right.

Instead of using the mouse to define the map sheets, it is also possible to directly enter the coordinates of the points in the fields :

With the button , the coordinates are validated and saved in the drop-down list on the right. The button can be used to delete the selected point from the list.

After validating with the button the map sheets are searched:

After having defined the order extent, the user can move on to the next step of the ordering procedure by clicking on the button .