[geotk] Re: Gaus Conform Projection

theuns theunsheydenrych at gmail.com
Tue Sep 15 09:16:57 EDT 2009

Thanks Martin

I also found the one you send in the link below, and yes it looks like
its more for the preserve of angles, not area.

Any chance of the projection being implemented in Geotk?

Thanks for time, and response.

On Tue, 2009-09-15 at 15:01 +0200, Martin Desruisseaux wrote:
> theuns a écrit :
> > On the map they give the projection as:
> > Gauss Conform Projection, Central Meridian 23° East, Hartebeesthoek 94
> > Datum(WGS84 Spheriod)
> > 
> > Is this what you meant by using the Universal Transverse Mercator?
> Apparently not. "Gauss-Kruger" and "Gauss-Boaga" are synonymous of UTM, but 
> according the page below "Gauss Conform" is really a different beast:
>      http://www.dwaf.gov.za/iwqs/gauss/node4.html
> www.epsg-registry.org is down right now so I can not check the details of that 
> projection, but I don't think that "Gauss Conform" is implemented in Geotk.
> > And that this would preserve area for the specific region around 23°
> > East?
> I don't know for "Gauss Conform". But for the Mercator projections, they do not 
> preserve area. They preserve angles instead. But if you don't move far away from 
> 23°, the simple Mercator projection may be an acceptable approximation.
> They were some guidline about how to setup a "personal" Mercator projection with 
> the "latitude true scale" of your choice here:
> http://lists.osgeo.org/pipermail/geotoolkit/2009-September/000160.html
> I need to reformat that content in a "how to" guide, but in the main time 
> hopefully the above may be of some help?
> 	Martin

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