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I need to extract faces (or polygons) from my road network and calculate their areas.

I mainly use ArcPy.

If it needs to be converted to graph structure, include it as well.

closed as off-topic by PolyGeo Jan 10 at 4:43

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  • To clarify, you want to convert your roads (lines) into polygons and calculate their areas? – Joseph Oct 1 '14 at 12:29
  • yes. in other words, I want to build the polygons surrounded by the segments of the road network. – msc87 Oct 1 '14 at 12:34
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    To create block polygons from road network lines you would use the road network as the input to the Features to Polygons tool help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//…, The lines need to actually touch or cross and fully enclose an area to form a polygon. Cul-de-sacs will not split a polygon and will be surrounded within a polygon, because they do not enclose an area. – Richard Fairhurst Oct 1 '14 at 14:09
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    I believe the equilavent to what @RichardFairhurst has correctly suggested in QGIS is the SAGA function: Convert lines to polygons. – Joseph Oct 2 '14 at 9:13
  • @RichardFairhurst I think you should copy/paste your comment as an answer. – PolyGeo Aug 5 '16 at 22:23
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To create block polygons from road network lines you would use the road network as the input to the Features to Polygons tool help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//…, The lines need to actually touch or cross and fully enclose an area to form a polygon. Cul-de-sacs will not split a polygon and will be surrounded within a polygon, because they do not enclose an area.

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