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I am trying to clean our cadastral polygons, eliminating gaps, overlaps, missing vertices at intersections, etc. I have tried the Snapper, GeometryValidator and AreaGapAndOverlapCleaner transformers but some of the polygons are regenerated with additional vertices due to the adjoining polygons missing vertices at intersections, where I would have expected them to be broken and a vertex added. I need the recommended transformers, with the correct parameters, that can clean up the topology of our cadastral polygons. I also wish to retain the data of all the attribute fields, if rebuilding the polygons is necessary.

The attachment shows the topological errors that I am trying to clean.

Hi @ed-camden,

In your Snapper, please set the Snapping Type to Segment Snapping. This should add the missing vertices for you.

Hello @daveatsafe.

Thank you for your suggestion, however as you can see below Snapping is already set. Would it help if I posted the entire workbench file?

Hello @daveatsafe.

Thank you for your suggestion, however as you can see below Snapping is already set. Would it help if I posted the entire workbench file?

Hi @ed-camden,

The workspace and a sample of the source data would be very helpful. You can anonymize the data by sending it through an Offsetter first before writing to an FFS file.

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