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ResultsI need to know how to create roads vector center lines from raster using ArcGIS. I have tried to use Iso Cluster Unsupervised classification tool to classify raster and set it to 30 classes. After that Reclassify tool to filter the roads cells from other values. After that I have used "Raster to polyline" tool and checked the Simplify box, but the results are a lot of lines looking like a polygons (screenshot). I need it to be just one road center line. This is a classic topographic map and I have a lot of roads to process so this can`t be a semi-manual process, I need it automatically as much as that is possible.

Does anyone know better way to solve my problem?

  • Hi user104851, could you provide more details? Maybe a couple of printscreens of original raster and final product. That way we can try to give a better informed guess. Cheers – Roberto Santos Sep 3 '17 at 8:13
  • How big is your area? If not too large or complex, digitizing by hand can often be quicker and more accurate than trying to wrestle vector data out of rasters programatically. – MappaGnosis Sep 3 '17 at 8:44
  • That is a classic topographic map contains roads, railroads, waterways, cities, etc, The roads that I want to filter and create the center lines of it are red colored. Also that is a very big area. – user104851 Sep 3 '17 at 10:12
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    Make sure you edit your question with any clarifications. Don't put them in the comments. Do you have a lot of roads to process or can this be a semi-manual process? You could create polygons from the road rasters, then convert to line, clip off the ends, and use the tool 'collapse dual lines to centerline'. – jbalk Sep 6 '17 at 7:17
  • Welcome to GIS SE! As a new user be sure to take the Tour to learn about our focussed Q&A format. I recommend not thinking about GIS SE as being some sort of online GIS tutor. For your questions to be answered here they should as much as possible describe not just what you want to do, but precisely what you have tried and where you are stuck trying that. – PolyGeo Sep 6 '17 at 23:04
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I have solved the problem using ArcScan toolbox. Great tool, exactly what I need.

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