Check segments : Intersections

Segment editor	File menu
Check segments - Intersections

Checks whether different segments intersect each other without a node. It is also checked whether segments partly overlap themselves. This check should be used when you wish to polygonize your segments and to make sure that contour lines do not cross each other.

Dialog box options:

Mask:	Select this check box if you want to check a specific selection of segments. Subsequently, specify the multiple search strings to check only those segments. Clear this check box to check all segments.
Start at Begin:	Start the check with the first segment.
Start at Number:	Start the check with any segment. Subsequently, type the (internal) segment number where the check should start. Previous segments will be skipped.

If different segments intersect each other without a node at the intersection:

the intersection is marked on the map with a red square;
a message box appears asking you to zoom in on the error or not;
whether you let the program zoom in or not, a subsequent message box will appear stating the code of the segment and the (internal) segment number, asking you to split the segments or not:

Yes: split the intersecting segments, and continue checking, or
No: return to the segment editor in Move Points Mode, and manually correct the error.

If a self overlap is found:

the overlap is marked on the map with a red square;
a message box appears stating the code of the segment and the (internal) segment number, asking you to zoom in on the error or not.

Whether you let the program zoom in automatically or not, you have to correct the error manually, for instance by using Move Points Mode.

After an automatic correction, the check will be continued automatically; after a manual correction, you have to restart the check yourself.

If no errors are encountered for this check, a message will appear stating that the segments are OK.

Segment editor

Check segments - Intersections