[pgrouting-users] Pgrouting-users Digest, Vol 83, Issue 16

[James Keener]

Thanks for your response Vicky!

I think I've figured out what the issue is: I'm not too bright!

I was expecting all reachable edges to be selected, but I was wrong.

All usable VERTICES are selected.

Cheers! and Thank you very much!

Jim

Aside:

I had originally built and installed from 0a8be6a

I've since purged the files from

/usr/lib/postgresql/9.3/lib/ and /usr/share/postgresql/9.3/extension/
and built and installed a14a70d which should be HEAD of develop_2_1_0 on
git://github.com/pgRouting/pgrouting.git


On 08/29/2015 12:19 AM, pgrouting-users-request at lists.osgeo.org wrote:
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>    1. Re: pgr_drivingdistance problem (Vicky Vergara)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Fri, 28 Aug 2015 23:19:12 -0500
> From: Vicky Vergara <vicky_vergara at hotmail.com>
> To: pgRouting users mailing list <pgrouting-users at lists.osgeo.org>
> Subject: Re: [pgrouting-users] pgr_drivingdistance problem
> Message-ID: <BAY177-W30521CFE1B5B17FE5E53BA8A6D0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hello Jim
> 
> I executed your query, I am not getting the same results as you are.
> Right now we are in the process of releasing pgRouting 2.1
> I used the pgr_DrivingDistance developed for the 2.1 version.
> The github branch develop has the latest but its changing a lot during this days.
> 
> Vicky
> 
> 
> 
> Date: Fri, 28 Aug 2015 20:45:45 -0400
> From: jim at jimkeener.com
> To: pgrouting-users at lists.osgeo.org; postgis-users at lists.osgeo.org
> Subject: [pgrouting-users] pgr_drivingdistance problem
> 
> 
>   
> 
>     
>   
>   
>     When I run pgr_drivingdistance
>     on an small extract (578 rows) (attached) from an extract
>       of Pennsylvania's osm pbf file not all edges are being
>     followed.
>     I first downloaded the pbf. Then I imported it with osm2pgrouting
>     
>       osmosis --read-pbf file=pennsylvania-latest.osm.pbf --write-xml pennsylvania-latest.osm
> osm2pgrouting -file pennsylvania-latest.osm -conf /usr/share/osm2pgrouting/mapconfig.xml -dbname osm3 -user jim -skipnodes -passwd hunter2
> 
>     
>     and then running
>     
>       CREATE TABLE smallways AS
>   SELECT * FROM ways 
>   WHERE ST_DISTANCE(the_geom, ST_GEOMFROMTEXT('POINT(-79.900121 40.448889)', 4326)) < 0.2;
> 
>     
>     and creating the appropriate indices to build a test environment
>     (the output of which
>     is the small extract (578 rows)(attached)).
>     To test pgr_drivingdistance, I did the following:
>     
>       CREATE OR REPLACE VIEW testing AS 
>   SELECT gid,
>     the_geom
>   FROM ( SELECT
>           seq,
>           id1 AS vertext_id,
>           id2 AS gid,
>           cost
>          FROM pgr_drivingdistance(
>           'SELECT gid AS id, source, target, 
>                   length AS cost, reverse_cost 
>            FROM smallways', 
>           179103,
>           0.5,
>           false, 
>           true) ) t
>   INNER JOIN smallways USING (gid);
> 
>     
>     and then loading that view into QGIS, I see the following:
>     
>     
>     Why are some edges not being selected? I initially thought it was
>     the (source, target) (labels in screenshot) ordering,
>     but that doesn't seem to be the case, as some edges such as 148517
>     to the SW of the annotated starting point, seems to be in good
>     order.
>     
> 
>       
> 
>       Jim
> 
>     
>   
> 
> 
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