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How to produce drive time polygons from polygon edge? (Network Analyst)

Question asked by ab18g16 on Mar 30, 2019
Latest reply on Apr 1, 2019 by jsandhu-esristaff

Hi all. I am creating a map showing food desert locations with Oxfordshire within ArcMap using the network analyst tool. I have a polygon of Oxfordshire and point data showing the location of large supermarkets across the UK. I also have OS road data with time of travel calculated. I want to be able to determine which of large supermarket points are within 25 minutes of the edge of the Oxfordshire boundary, so I can remove those not of interest to my study. Not sure what the best way of doing this is, apologies if my explanation is not clear. Any thoughts would be greatly appreciated.