Locate points that are snapped to an edge of a line but not a vertex or end point

Can you turn all your lines into points with the chopper with maximum vertices set to 1 and then use the PointOnPointOverlayer to identify any points that don't overlap?

Several options with slightly different outcomes / specialties:

• PointOnLineOverlayer
• Intersector
• TopologyBuilder

If you need some notion of tolerance, consider the NeighborFinder.

Thnaks for your answer, but I don't think this method will identify those point that actually fall on the line though, just points that don't fall on a vertex or end point. There will be points in the data that aren't on the line at all and I'm not interested in those.

Posted before finishing, once you have identified points that don't overlap with end points or vertexs you can then use the point on line overlayer to identy which fall on the line.

I had tried PointOnLineOverlayer earlier, but with a point tolerance of 0, so again this only seemed to work where points matched existing vertices of the lines. If I slightly increase this tolerance it seems to use the additional points

I think I am going to take another look at the PointOnLineOverlayer. I had originally used it but with a point tolerance of 0 so it was only breaking the lines where points matched existing vertices on the line. Tweaking this setting seems to generate results more along the lines of what I am hoping for.

Hi @iew, generally FME computes spatial relationships with full precision of the floating point number. It's different from other softwares such as ArcGIS, which are lenient to a slight computational error. Since there is an unavoidable computational error always in any calculation, the PointOnLineOverlayer with tolerance of 0 cannot determine whether a point is located on a line except some special cases (e.g. the case where the point exactly matches a vertex of the line, or the line is exactly parallel to the X or Y axis). Try setting a slight tolerance, e.g. 1e-8 or so, to the tolerance parameter.