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I have a shapefile that contains station locations and another shapefile that is the geocoded origins of those who drove to the station. I would like to make a buffer around the station that shows the area where 90% of the vehicles came from so I can show the general drive access area for each station without the extreme outliers.

Again, from my current files I would like to create a raster or shapefile that shows the general catchment area of each station.

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    What software are you using?
    – user681
    Jan 17, 2014 at 22:00
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    Please provide some more information. One important detail is whether your shapefile that contains the origins also contains an attribute for the end station.
    – Get Spatial
    Jan 17, 2014 at 22:00
  • What GIS software and version are you using?
    – PolyGeo ♦
    Jan 17, 2014 at 22:01

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Calculate the distance to all origin points, select the 90% nearest and then do a convex hull calculation to get the catchment area. Exact steps depend upon your software.

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