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I have roads and trails in one shapefile (file A) and in a separate I have lines which show which trails are signposted (file 😎. Unfortunately the later is not very precise so it does not align well with the trail or road. Can I use FME to detect proximity and then create a new shapefile where this proximity is marked by "high-lighting" the relevant parts of the trails/roads in file A?

Hi @aron

Have a look at the NeighborFinder transformer for proximity analysis it will result in a distance attribute between the features.

Maybe look at the AnchoredSnapper, it will let you "snap" the signposted trail lines (file 😎 to your roads and trails (file A). Make sure to set the snapping type to Segment snapping.

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