[pgrouting-users] polygons of drivingDistance

[Ko Nagase]

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)]
http://docs.pgrouting.org/2.1/src/driving_distance/doc/dd_points_as_polygon.html#pgr-points-as-polygon

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.

Regards,

Ko


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