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I want to calculate the travel time (based on walking time) from locations to the closest N points of another dataset. Then I want to create a hull around those N closest points per location

Is this possible? How can this be done?

The software does not really matter; I have access to QGIS, FME, ArcGIS, R, python; any other software is fine with me. However, I do not know where to start.

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    Isochrones are about time. Isodistances are about travel distance. What do you really want to do, without using the term "isochrone"? – bugmenot123 Jul 18 at 8:57
  • I have different locations (where to vote) and I want to know which are the closest 1000 voters (based on time). And then I want to create a polygon based on the points. – Stefan Jul 18 at 9:02
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    So you want to calculate the travel time from locations to the closest N points of another dataset. And you also want to create a hull around those N closest points per location. – bugmenot123 Jul 18 at 9:05
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    Then update your question accordingly ;) – bugmenot123 Jul 18 at 9:11
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    That is done. Thanks – Stefan Jul 19 at 9:34
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With Qgis and ArcGIS, you can use network analyst tools. Use the Origin Destination Matrixes from here

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You can do something like that in FME Workbench. Here you have step-by-step instruction at knowledge.safe.com: It probably would need some modification for your purpose.

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