[postgis-users] polygonize requirements

[strk at refractions.net]

On Fri, Apr 29, 2005 at 12:33:21PM +0200, Markus Schaber wrote:
> Hello,
> 
> According to the PostGIS manual, polygonize works with "GEOS >= 2.1.0".
> However, I get the following error message:
> 
> 
> logigis=# select polygonize('LINESTRING(1 1, 1 0, 0 0, 0 1, 1 1)');
> NOTICE:  GEOS library does not support required interface 3
>  polygonize
> ------------
> 
> (1 row)
> 
> logigis=# select postgis_full_version();
>                                          postgis_full_version
> 
> ------------------------------------------------------------------------------------------------------
>  POSTGIS="1.0.0" GEOS="2.1.1" PROJ="Rel. 4.4.9, 29 Oct 2004" USE_STATS
> DBPROC="0.3.0" RELPROC="0.3.0"
> (1 row)
> 
> 
> 
> It is a PostGIS debian package that was compiled by one of our admins
> for an AMD-64 Ubuntu machine.
> 

Did your admin built postgis against a precedent version of GEOS ?

strk=# select polygonize('LINESTRING(1 1, 1 0, 0 0, 0 1, 1 1)');
                                                                                                  polygonize                                                    
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 01070000000100000001030000000100000005000000000000000000F03F000000000000F03F000000000000F03F0000000000000000000000000000000000000000000000000000000000000000000000000000F03F000000000000F03F000000000000F03F
(1 row)

=# select postgis_full_version();

 POSTGIS="1.0.0" GEOS="2.1.1" PROJ="Rel. 4.4.8, 3 May 2004" USE_STATS DBPROC="0.2.1" RELPROC="0.3.0" (needs proc upgrade)


The (needs proc upgrade) should not be a problem as the NOTICE you see
is generated by C code, not plpgsql.

Check out contents of lwgeom/postgis_geos_version.h in the postgis
soruce tree, and see if it maches 2.1.1

--strk;