[postgis-devel] length{,2d,3d}

[Mark Cave-Ayland]

> -----Original Message-----
> From: postgis-devel-bounces at postgis.refractions.net 
> [mailto:postgis-devel-bounces at postgis.refractions.net] On 
> Behalf Of Martin Daly
> Sent: 25 August 2004 12:01
> To: PostGIS Development Discussion
> Subject: RE: [postgis-devel] length{,2d,3d}
> 
> 
> Mark,
> 
> > Thanks for the pointers, as you suspected I was still looking
> > at just the original spec PDF. The case of a 2D -> 3D cast 
> > doesn't appear to be a problem, however it looks like there 
> > are some interesting functions to write around the spatial 
> > operators, for example collapsing a 3D geom to 2D, 
> > calculating the difference, and then interpolating the result 
> > back into 3D.... does GEOS already do this? :)
> 
> The document addresses this in section 3.1.4, below.
> 
> Regards,
> Martin


Hi Martin,

Sorry I obviously didn't ask my question in the right way; what I was
looking for was confirmation that GEOS could do this transformation,
i.e. does GEOS do the 3D <-> 2.5D conversion according to the spec, or
does it only accept 2D coordinates?


Kind regards,

Mark.

---

Mark Cave-Ayland
Webbased Ltd.
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