[pgrouting-users] Error message- isring() should only be called on a LINE

[Daniel Kastl]

Hi Julien,

pgRouting can only handle LINESTRING. If you really have MULTILINESTRING
geometries, how would you define the source and target node? You would
have more than one for source/target but just one column for each.

J answered such a question on Stackexchange:
http://gis.stackexchange.com/questions/116414/take-from-multilinestring-the-start-end-points/116444#116444

Hope that helps,
Daniel


On 30/11/15 03:11, Julien Lacroix wrote:
> Hello Daniel, > > i've run into the exact same error message today and in fact, my
geom column is MULTILINESTRING. > Did i have to convert my edge geom to
LINESTRING for using them proper in pgRouting? > > Sincerely, > Julien >
> Hi Bob,
>
> The error complains, that "st_isRing(st_linemerge(geom))" should be
> called on LINESTRING geometries only.
>
> What is your geometry type of your "geom" column?
> Is it MULTILINESTRING?
>
> Best regards,
> Daniel
>
>
>
> On 06/10/15 06:07, Bistrais, Bob wrote:
> > I am trying to build a statewide road network for analysis with
> > pgRouting.  I ran pgr_createTopology, and it reported OK.
>
> > Next I tried to run pgr_analyzeGraph, and got an error.
>
>
>
> > Here is the command I input:
>
> > SELECT
> > pgr_analyzeGraph('ng_roads',0.0001,the_geom:='geom',id:='gid',source:=
> 'sourceroute',target:='targetroute');
>
>
>
>
> > And here is the error message:
>
> > NOTICE:  Analyzing for ring geometries. Please wait...
>
> > ERROR:  isring() should only be called on a LINE
>
> > CONTEXT:  SQL statement "SELECT count(*)  FROM public.ng_roads
>
> > WHERE true   AND (true) and st_isRing(st_linemerge(geom))"
>
> > PL/pgSQL function pgr_analyzegraph(text,double
> > precision,text,text,text,text,text) line 309 at EXECUTE statement
>
>
>
> > -What should I do about this?  Can I still perform pgRouting
> > analysis with these roads?
>
>
>
> > _______________________________________________ Pgrouting-users
> > mailing list Pgrouting-users at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/pgrouting-users
>
>
> -- Georepublic UG & Georepublic Japan
> eMail: daniel.kastl at georepublic.de
> Web: http://georepublic.info
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