I'd rather keep it as it is, or even have it throw an exception. If you want all endpoints use ST_Boundary (which should be extended to support boundary node rule, btw).
I was also thinking that ST_StartPoint could probably be improved to avoid full detoasting of the geometry... --strk; On Thu, Sep 27, 2012 at 08:06:38AM -0700, Martin Davis wrote: > In which case why not just extend ST_StartPoint to include this > behaviour? Always nicer to keep the function list as short as > possible. > > On 9/27/2012 7:31 AM, David William Bitner wrote: > >Perhaps to match a number of people's expectations, there should > >be an ST_First Point() that is basically > >ST_StartPoint(ST_GeometryN(ST_Multi(geometry),1)) > > > > > > > >On Tue, Sep 25, 2012 at 4:08 PM, Paul Ramsey <pram...@opengeo.org > ><mailto:pram...@opengeo.org>> wrote: > > > > When ST_NumGeometries == 1, you can run ST_StartPoint on > > ST_GeometryN(geom,1). Where ST_NumGeometries > 1 you are in > > "interpretation land". What's the start point of a geometry with two > > lines? > > > > P. > > > > On Tue, Sep 25, 2012 at 1:38 PM, David Quinn > > <daithiqu...@gmail.com <mailto:daithiqu...@gmail.com>> wrote: > > > As ST_StartPoint( multilinestring ) returns NULL for PostGIS 2.0 > > > (http://postgis.refractions.net/docs/ST_StartPoint.html ), what > > > approach can be used to identify the start and end points of a > > > multilinestring? > > > > > > Thanks, > > > David > > > _______________________________________________ > > > postgis-users mailing list > > > postgis-users@postgis.refractions.net > > <mailto:postgis-users@postgis.refractions.net> > > > http://postgis.refractions.net/mailman/listinfo/postgis-users > > _______________________________________________ > > postgis-users mailing list > > postgis-users@postgis.refractions.net > > <mailto:postgis-users@postgis.refractions.net> > > http://postgis.refractions.net/mailman/listinfo/postgis-users > > > > > > > > > >-- > >************************************ > >David William Bitner > > > > > >_______________________________________________ > >postgis-users mailing list > >postgis-users@postgis.refractions.net > >http://postgis.refractions.net/mailman/listinfo/postgis-users > > > > > >No virus found in this message. > >Checked by AVG - www.avg.com <http://www.avg.com> > >Version: 2012.0.2221 / Virus Database: 2441/5293 - Release Date: 09/26/12 > > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
