[postgis-devel] Is ST_IsValid OGC or not OGC?

[Paul Ramsey]

ST_IsValid is *not* an OGC defined function, but verifies that the
input geometry conforms to the structures and relationships for
geometry described in the OGC simple features specification.

P.

On Mon, Oct 5, 2009 at 12:39 PM, Mateusz Loskot <mateusz at loskot.net> wrote:
> Hi,
>
> The manual [1] documents ST_IsValid as follows::
>
> "This method implements the OpenGIS Simple Features
> Implementation Specification for SQL."
>
> The same manual says about ST_IsSimple this:
>
> "This method implements the OpenGIS Simple Features Implementation
> Specification for SQL. OGC SPEC s2.1.1.1"
>
> Not very different, is it? However, perhaps the chapter number
> makes a big difference and it indicates the ST_IsSimple is official OGC
> function.
>
> Back to ST_IsValid, what does that sentence above exactly mean?
> Does it mean it is "based on notes from OGC spec" or does it mean it is
> one of the officially documented OGC functions (as ST_IsSimple is)?
>
> The ST_IsValid is nowhere mentioned in the following three documents:
> OGC 06-104r3, OGC 05-134 and OGC 99-049.
> So, the PostGIS manual is somewhat confusing to me.
>
> I would appreciate clarification.
>
> Best regards,
>
> [1] http://postgis.org/documentation/manual-1.4/ST_IsValid.html
> --
> Mateusz Loskot, http://mateusz.loskot.net
> Charter Member of OSGeo, http://osgeo.org
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