1

I have a polygon layer representing road surfacing layers. My task was to "thin out" the polygons in order to come up with a network of 'road centerlines' (dark green).

I generated this new polyline layer as follows in ArcMap:

  • Rasterized the road surfacing layer to a generously high resolution
  • Binarized the road surfacing layer where values of 1 indicate presence of road and values of 0 indicate no presence of road.
  • Thinned out the raster layer
  • Vectorized the thinned raster layer using "Raster to Polyline" tool

The result is conceptually OK since it does somehow find the centerlines of the polygons. However I am ending up with some really ugly artifacts as follows which originate from the thinned raster:

enter image description here

Zooming in a bit closer:

enter image description here

Now I am doubting whether this approach is appropriate, since it generates so many defects that would take an unreasonable amount of time to fix manually.

How can I either :

  • automate the fixing of these defects
  • prevent that these defects occur in the first place? I.e using another method for example...

1 Answer 1

1

First, you could use "collapse dual lines to centerline" if you had the advanced licence.

Concerning your method, you should use a larger maximum distance with your thin command. This would explain your artefacts.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.