Multiple polygons created with Isochrone

[yingtaoxie]

Hi,
I am trying to create some isochrones with the package, but the resulting map always includes more than 1 polygons for a single point. Is there a reason why multiple polygons rather than just one are created?

The code I am using looks similar to the package sample:
iso <- osrmIsochrone(loc = c(36.8032934, -1.2567891), breaks = seq(from = 0, to = 10, by = 10), res = 100)

[e-kotov]

This is probably a side effect of the mechanism for isochrone creation in osrm package: OD matrix sampling, rasterisation, then contour lines are created from the raster... therefore you see these artefacts.

Try playing around with the res argument.

Here's an overview of the possible isochrone generation techniques (in Python...). It may be useful for understanding that osrm approach is not the only one out there.
http://kuanbutts.com/2017/12/16/osmnx-isochrones/

[rCarto]

thx for the reply @e-kotov