Check segments : Closed segments

Segment editor	File menu
Check segments - Closed segments

Checks whether each segment has only 1 node serving both as the begin node and as the end node. This format is required if you wish to use non-topological polygonization, for instance when you imported vector files (e.g. DXF) into ILWIS earlier on, and now wish to polygonize the segment map which is the result of the import.

Mind: You only need to use this check if you wish to use non-topological polygonization later on.

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 in a segment a second node is found:

the second node is marked on the map with a red square;
a message box appears stating the code of the segment with the error 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 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 - Closed segments