[postgis-users] Followup: AsSVG and precision control

strk at refractions.net strk at refractions.net
Thu Jan 13 07:14:24 PST 2005

Actually I've already set the code to Klaus' behaviour:

 * Revision 1.4  2004/10/15 09:41:22  strk
 * changed precision semantic back to number of decimal digits

Just didn't go in the 0.9 branch..

There are no plans for another release in the 0.9 branch, so
you should probably wait for 1.0 to come out.


On Thu, Jan 13, 2005 at 02:56:52PM +0100, Andreas Neumann wrote:
> Hello,
> I would like to continue the thread between Klaus and strk from October 
> 2004.
> http://postgis.refractions.net/pipermail/postgis-users/2004-October/005954.html
> Klaus wrote a patch (http://svg.cc/pg/assvg/assvg-0.5.1.patch) that 
> allows better precision control than the version distributed with the 
> official postgis distribution.
> From what I read in the thread I have the impression that strk maybe 
> misunderstood the intention from Klaus.
> With Klaus' patch one can specifically set the nr of decimal places (the 
> places after the decimal point) to say 1, while with the old version 
> distributed with Postgis one cannot specifically control the decimal 
> places, but only the overall number of digits including the decimal 
> places. I think Klaus patch is more elegant and should be made the 
> default version in Postgis.
> To illustrate the problem with the old solution:
> say the coordinate range in your project varies from 500 to 500000, in 
> AsSvg you specify that you want 8 digits, than the coordinates with 500 
> will have more decimal places (5 decimal places, more accurate) than the 
> coordinates with say 400000 (2 decimal places, less accurate), which 
> means, that you have a varying accuracy over the whole project. I don't 
> think that this is the behaviour that the Postgis/SVG users want.
> So, please, if possible, if you could make Klaus patch 
> (http://svg.cc/pg/assvg/assvg-0.5.1.patch) the default AsSVG function in 
> the official Postgis distribution, that would really help.
> Thanks for your help!
> Andreas
> -- 
> --
> ---------------------------------------------- 
> Andreas Neumann - Department of Cartography 
> Swiss Federal Institute of Technology (ETH) 
> ETH Hoenggerberg, CH-8093  Zurich, Switzerland 
> Phone: ++41-1-633 3031, Fax: ++41-1-633 1153 
> e-mail: neumann at karto.baug.ethz.ch 
> www: http://www.karto.ethz.ch/neumann/ 
> SVG.Open: http://www.svgopen.org/ 
> Carto.net: http://www.carto.net/
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