[postgis-users] Re: GEOS Installation Testing Help

[Darren Houston]

Interesting.

>From Steffen's suggestion I tried:

SELECT intersection('POINT(1 1)', 'POINT(1 1)');

and PostgreSQL/PostGIS returned:

SRID=-1;POINT(1 1)

Well, unless a PostGIS programmer says otherwise, or I'm given a Geos
specific query that fails, I will almost definitely say that I have a
working Geos 1.0 install (with PostGIS). My PostgreSQL 7.3X was
installed fresh with my Linux operating system install (with no link to
lstdc++). So, there is a way to get around having to re-install
PostgreSQL from source.

I have also used other Geos functions such as boundry() buffer()
isvalid() and issimple() with success.

Thank you Steffen for your query.

Darren H.

> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net
> To: PostGIS Users Discussion
> Sent: 12/5/03 12:31 AM
> Subject: Re: [postgis-users] GEOS Installation Testing Help
>
> Darren,
>
> > I tried;
> >
> > SELECT geomunion(
> >         'GEOMETRYCOLLECTION(POINT(0 0), LINESTRING(1 1))',
> >         'POINT(0 0)'
> > );
> >
> > and I received this error;
> >
> > NOTICE:  IllegalArgumentException: This method does not support
> > GeometryCollection arguments
> > ERROR:  GEOS union() threw an error!
> >
> > PostgreSQL isn't affected by the error.
>
> It is correct and necessary that you receive this error. The test is
> looking
> for this error message. If it wouldn't be there, the PostgreSQL server
> backend most probably would crash.
>
> Here's another simple query that tests for GEOS (but doesn't return
> an error message):
>
> select intersection('POINT(1 1)', 'POINT(1 1)');
>
> This should return POINT(1 1)
>
> Steffen
>
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>


--
Darren Houston

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