Isochrone polygon not capturing edges properly

When generating isochrones near Thames some edges are not properly included in the generated isochrone polygon. Initially i used the car profile and got the following result.

Screenshot 2021-09-07 at 16.45.06

Then I thought that this is happening as the paths at the edges are foot paths so cars are not allowed. So i changed the profile to be “foot walking” but I still get the edges excluded (see here)

For comparison it seems the mapbox isochrone service is fairly good at that.

Screenshot 2021-09-07 at 16.52.16

So it seems that nodes at the edges are excluded for some reason. Is there any kind of configuration that could fix that?

Hey,

this has to do with how the polygon is being created from the actually reachable points on the road network.
This issue has a brief explanation.

This will even lead to different isochrones if different distances with intervals are requested, that result in the same “partial” isochrones. In the following, a 1km, the 1km of a 2km and the 1km of a 4 km isochrone is shown:

I have opened an issue about this, feel free to follow the discussion there.

Best regards