[postgis-devel] Z() function

[strk]

On Wed, Aug 11, 2004 at 12:43:59PM -0400, Carl Anderson wrote:
> David Blasby wrote:
> 
> >It should be returning 0.
> >
> >PostGIS stores everything as x,y,z points.  If you give it only (x,y)
> >it'll set z to 0.
> >
> >The LWGEOM objects are smarter about this.
> >
> >dave
> >
> > 
> >
> I get 1.7e-308 about 1/4 of the time.
> 
> it creeps into data  through custom functions and
> makes JUMP very unhappy.
> 
> Should I try turning off compiler optimizations?
> 
> C.

Carl, please check documentation for your 'strtod'
function. WKT parser uses strtod and sets Z to 0.0 if
it sets the second argument to the same value of the
first argument. This conforms to ANSI C.

ref: postgis_inout.c:439

--strk;

> 
> 
> 
> 
> -- 
> Carl Anderson
> GIS Manager Fulton County, Georgia
> carl.anderson at co.fulton.ga.us
> 404.730.8026
> 
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