What transformer could be used to identify if a townland border which is lines, is supported by an underlying line feature and any areas that are supported to be extracted.
Question
Transformer to identify parts of a boundary (line) that are supported by an underlying line feature
+23- Enthusiast
You could use the SpatialFilter
You could compare the border lines with themselves for selfintersection, beside this you can compare the areas with the border lines.
The underlying lines part is not completely clear to me. In case this is from the border lines itself, there is potentially self overlapping lines. Better would be to dissolve these lines as much as possible. In case there is a separate lines dataset you can both use both line datasets as Candidates and Filter for both input ports.
Example how you could use the SpatialFilter:
