[pgrouting-users] polygons of drivingDistance

Ko Nagase nagase at georepublic.co.jp
Mon Jan 4 04:17:47 PST 2016

Hi Jakob,

Are you using pgRouting v2.1 ?
If so, could you try to specify same alpha value (except 0) in both cases ?

[pgr_pointsAsPolygon — pgRouting Manual (2.1.0)]

I guess that different optimal alpha value are used in the cases.

If specifying same alpha value doesn't solve the problem, please
create a ticket on
Github(https://github.com/pgRouting/pgrouting/issues) and upload
coordinate records(*.sql or *.csv)
to somewhere.



2016-01-04 20:24 GMT+09:00 Jakob Miksch <jakob.miksch at posteo.eu>:
> Dear List,
> I calculated the pgr_DrivingDistance for two costs (10 min, 20min). Then I
> used pgr_pointsAsPolygon  in order to get polygons out of my points. Usually
> it works well, but sometimes the polygon with the "lower" cost covers some
> areas which the polygon with "higher" cost does NOT cover. Here is an
> example:
> https://www.dropbox.com/s/tblyp7q4sp56sla/Error%20Alphashape.png?dl=0
> (green=low cost   red=high cost)
> My goal is that polygons with "lower" cost are completely inside polygons
> with "higher" cost.
> How would you approach this issue?
> Best,
> Jakob
> _______________________________________________
> Pgrouting-users mailing list
> Pgrouting-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/pgrouting-users

Ko Nagase (長瀬 興)
Georepublic Japan
mail: nagase at georepublic.co.jp
web: http://georepublic.co.jp

More information about the Pgrouting-users mailing list