[postgis-users] Well done with GEOS & QGIS!!!

[Martin Davis]

Thanks, Brent (for pieces which apply to me....  8^)

And if you use JUMP you can use it to perform the isValid test as well  
(it's built on essentially the same codebase as GEOS)  8^)

Martin

Brent Wood wrote:
> Instead of asking for help or features, just for a change I figured I'd pass on
> some thanks for something working perfectly (touch wood, fingers crossed....
> :-)
>
> I just ran difference() & got a GEOS error:
> NOTICE:  TopologyException: found non-noded intersection between 173.56
> -35.3436, 173.558 -35.3364 and 173.56 -35.3412, 173.557 -35.3388 173.559
> -35.3407
> ERROR:  GEOS difference() threw an error!
>
> It sort of made sense, & suggested there was a topology error in my polygon.
> I ran isvalid() & got a false on the very polygon I was using in difference,
> along with the message:
> NOTICE:  Self-intersection at or near point 173.559 -35.3407
>
> Wow!!! All I needed to know! 
>
> Opened it up in QGIS, zoomed in & there it was, make it editable, drag some
> vertices around to fix the error, save it, re-run the SQL & it worked
> perfectly.
>
> Fantastic to see this level of useability, interoperability  & topology support
> coming out of these tools.
>
>
> Kudos to all you developers out there!!!
>
>
> Cheers,
>
>   Brent Wood 
>
>
>
>
>
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>   

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