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Hi,

I have two polylines (representative of roads centerline) that have common geometries in some certain stretch of a road network. In ArcMap I can simply use "intersect" analysis and find the line segments that are intersecting each other. figure below is the demonstration of results that I can obtain from ArcGIS intersect analysis.

However, when I use "LineOnLineOverlay" transformer in FME and filter the results over the overlap counter attribute (by default, it is set to "_overlap"), the results are not similar at all (see the figure below).

In addition, I tried "intersector" transformer along with a similar filtering method and I got the similar results as the LineOnLineOverlap one.

Is there any alternative solution that I should try? Or is there a part that I am missing to take into account?

Best regards

It boils down to tolerance and precision between your two datasets. FME always works with full precision, meaning that if you compare two vertices that are 1/10mm apart they will be considered non-intersecting, even though they appear to be identical on screen.

You can either try to snap the two datasets together with a tiny tolerance, or you could buffer one of the lines with a tiny amount and use the LineOnAreaOverlayer in stead.

I'm sure there are also some other ways of doing it, but it depends on your specific requirements and your data.

The point on line overlayer does allow for a tolerance so one approach can be to convert one line to points, test whether points fall on the line then rebuild the line geometries from points with overlaps

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