Segment editor |
File menu |
Check Segments |
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With Check Segments you can check whether segments have been correctly digitized. The Check Segments command is also automatically performed when you choose the Polygonize option in the segment editor.
Select one of the following options:
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Checks whether segments overlap themselves. Overlapping segments cannot be polygonized, with this option overlaps can be traced and corrected. |
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Checks whether segments have dead ends. Segments with dead ends cannot be polygonized, with this option dead ends can be traced. |
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Checks whether different segments cross each other. Crossing segments cannot be polygonized, also contour lines with different height values are not supposed to cross each other. With this option intersections can be traced and corrected. |
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Checks whether segments, which are connected to each other by a node, have the same value. This option is designed to check whether a contour line, which consists of multiple consecutive segments, has one height value. To polygonize segments, this check is not necessary. |
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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. |
If an error is encountered, some questions will be asked whether you wish to zoom in and whether the segment(s) should be automatically corrected (if possible). If you answer these questions with No, the segment check stops and you can correct the error manually. 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 a check, a message will appear stating that the segments are OK.
See also:
Check segments : Intersections
Check segments : Code consistency