[postgis-users] Polygon and north pole

[Paul Ramsey]

The IsValid function does not exist unless you have JTS/GEOS support.  
Your geometry has nothing to do with this error message.

On the topic of your geometry, you can insert it, but in a planar  
interpretation of lon/lat, which is what we have, it will not be  
handled "right" in every case, and if it self-intersects in planar  
space (a common situation for pole-covering things) it will be  
"invalid". It will still be storable, though.

P

On 16-Jul-07, at 4:30 AM, Jørn Vegard Røsnes wrote:

> Hi,
>
> is it possible to insert polygons into PostGIS where the polygon  
> "cross" the
> north pole?
>
> Example:
>
> select isvalid('POLYGON((152.991022 78.938867,79.710092  
> 68.321799,-50.514656
> 62.226884,-9.980464 56.376708, 152.991022 78.938867))');
> ERROR:  isvalid:: operation not implemented - compile PostGIS with  
> JTS or GEOS
> support
>
> Will it help to compile PostGIS with GEOS/JTS support?
>
> cheers
> Jørn Vegard Røsnes
>
>
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