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Using ArcMap, is it possible calculate distance from a postcode (point) to nearest polygon using a road network layer (polyline)? As opposed to just calculating Euclidean distance?

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You can do this using the Network Analyst Extension.

  • Build a network using your road layer (requires network analyst extension)
  • Identify nearest polygon using point distance tool or near tool (or use existing point if known)
  • Add nearest polygon point and postcode point as stops in the network solver
  • then compute a route distance from your post code point to the nearest polygon. Total_length gives you distance along road. see sample below.

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