[postgis-users] ST_StartPoint() for MultiLineStrings

[David William Bitner]

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 <pramsey at 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 <daithiquinn at 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
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-- 
************************************
David William Bitner
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