Identify self intersecting polygons along with spikes

For the spikes:

Have a look at the SpikeRemover transformer, specifically the Remove Spike Iteratively parameter. I've never actually used that transformer, but the language in the documentation seems like it might help you.

If you don't actually want to change the geometry but the SpikeRemover gives you useful information about the spike count, you could give the features a UniqueID either with the UUIDGenerator or the Counter. Then after you have extracted the spike count , relate it back to the original feature using FeatureMerger.

-OR-

You could extract the original geometry first using the GeometryExtractor, then after getting the spike info, replace the geometry with the original using GeometryReplacer.

For the self-intersections (bowties):

I would have thought the GeometryValidator would have called these out using the Self-Intersection in 2d. Did you set the parameter for Check for Self-touching polygons to Yes?

For the spikes:

Have a look at the SpikeRemover transformer, specifically the Remove Spike Iteratively parameter. I've never actually used that transformer, but the language in the documentation seems like it might help you.

If you don't actually want to change the geometry but the SpikeRemover gives you useful information about the spike count, you could give the features a UniqueID either with the UUIDGenerator or the Counter. Then after you have extracted the spike count , relate it back to the original feature using FeatureMerger.

-OR-

You could extract the original geometry first using the GeometryExtractor, then after getting the spike info, replace the geometry with the original using GeometryReplacer.

For the self-intersections (bowties):

I would have thought the GeometryValidator would have called these out using the Self-Intersection in 2d. Did you set the parameter for Check for Self-touching polygons to Yes?

HI, thanks for the suggestion but I don't think that will resolve my query. I'd like to identify them only, not remove them.... unless I've misunderstood

@jez​ I just realized you uploaded your source data. Take a look at this workbench. It should get you pointed in the right direction to calculate both the spike and self-intersects counts.