[postgis-devel] Testing on Windows PostGIS 1RC1

[Martin Davis]

  I thought it might be worth pointing out that LINESTRING (1 2, 1 2) is 
not invalid according to the OGC SFS.  Is it considered invalid in PostGIS?

On 9/22/2010 4:24 PM, strk wrote:
> On Thu, Sep 23, 2010 at 12:18:37AM +0200, Nicklas Avén wrote:
>
>> select st_snaptogrid('LINESTRING(1 2, 1 2)'::geometry, 0.1)
>>
>> So we don't get a parse error or an empty geometry, but... nothing
>>
>> Maybe empty geometry would be better?
> FWIW, that's an invalid geometry.
> ST_MakeValid would make it a POINT.
>
> But yes, SnapToGrid turns collapsed geomeries into NULLs,
> intentionally, as it was designed as a vector reduction tool.
>
> Dunno what would an empty give you more than the current NULL.
> Possibly a POINT would help you more.
>
> --strk;
>
>    ()   Free GIS&  Flash consultant/developer
>    /\   http://strk.keybit.net/services.html
> _______________________________________________
> postgis-devel mailing list
> postgis-devel at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-devel
>

-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022