topic Re: Identify roads affected by barriers in ArcGIS Network Analyst Questions

Identify roads affected by barriers

Greta — Sat, 16 Sep 2023 22:40:14 GMT

It is possible to identify roads affected by a polygon barrier using Network analysis. I mean not only the roads that intersect the polygon but also those that do not touch the polygon but are also affected by the barrier.

Thanks

Re: Identify roads affected by barriers

DavidPike — Sun, 17 Sep 2023 18:54:11 GMT

Probably easiest to just run a Service Area analysis to identify unreachable areas after polygon barriers are applied https://pro.arcgis.com/en/pro-app/latest/help/analysis/networks/service-area-analysis-layer.htm

Note the 'Lines Feature Class' section in the help above. Set the output shape type to lines and you'll get only the traversable road segments returned. You can then just use that to select and delete or erase your original edges/roads input features - that will then return the non-traversable edges due to the barriers.

Also not you'd need to set a Cutoffs (analysis setting) or Breaks (input parameter) large enough to cover your intended possible area. If you don't do this, then your analysis could be misleading.

Re: Identify roads affected by barriers

JaySandhu — Tue, 19 Sep 2023 20:39:07 GMT

Can you use a GP tool like Select By Location and use the Intersect option to select all the streets that intersect your barrier polygons?

Jay Sandhu