I am trying to run an isochrone analysis in ArcGIS Online using Analysis > Use Proximity > Create Drive-Time Areas.

The resulting polygons are stretched North-South, I suspect this is due to the analysis being done in WGS 84 instead of a projected coordinate system.

Is there a way to fix this? Possibly by running the analysis using a projected coordinate system?


As per Vince's request:

I used the Create Drive-Time Areas analysis tool with the following parameters:

  • Walking Time (5 minutes)
  • Towards Facility
  • Areas from different points - Overlap
  • Use current map extent - Unchecked

There is no option available to specify performing geodesic calculations.

The study area is at approximately 53° North.

  • Analysis is generally done in the units in which the data is stored. – Vince Dec 20 '19 at 13:34
  • @Vince the point data I uploaded as the origin is in the correct projected coordinate system. – TeddyTedTed Dec 20 '19 at 13:43
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    On-the-fly reprojection is expensive. Is the hosted copy in the default Web Mercator or as a WGS84 geographic CS? – Vince Dec 20 '19 at 13:56
  • I think it's in Web Mercator but the actual shapefile I uploaded was in my local projection system – TeddyTedTed Dec 20 '19 at 14:08
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    Your question asserts that a geographic projection would skew to the north, but in fact, it would be Web Mercator which could do so. Please Edit the question to give details of the options you used (especially if offered the option to perform geodesic calculations), and of the extent of the data processing. Note that, since locations near the pole are smaller in area per square degree, it's not unexpected that distances would increase visually to the north. – Vince Dec 20 '19 at 19:57

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