[postgis-users] Well done with GEOS & QGIS!!!
pcreso at pcreso.com
Wed May 9 20:13:50 PDT 2007
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
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
Fantastic to see this level of useability, interoperability & topology support
coming out of these tools.
Kudos to all you developers out there!!!
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