[mapserver-users] Gauss-Krüger

[Jan Hartmann]

If your map is from 1908, there is a change that its projection is not 
in the official modern EPSG table. In that case you need to derive the 
whole PROJ4 definition from the legend of the map. As a rule, this is 
not difficult, as the theoretical definitions of the common projection 
have been known for a long time, it's just a matter of discovering which 
particular set of parameters has been chosen for this map. In my 
experience with old Dutch maps the main difficulty is finding out which 
ellipsoid has been used. In your case, a map of 1908 can in no way have 
had a WGS84 datum. You probably have to project it to a modern 
projection with the original ellipsoid, and from that to WGS84.

Can you give any details of the maps you are working with and whether 
their legends say something said about the projection? Are they part of 
a larger map series?

Jan

On 11/16/10 12:02, Daiane Fraga wrote:
> Hi,
>
> I understand what you say. But this is not my question. I'm with a map 
> in a coordinate system outdated (the maps are dated from 1908). And 
> I'm using an application that interacts with Google Maps, which has 
> caused problems. Did you know how to do some kind of conversion from 
> the Mapserver?
> We can do a conversion to the WGS 1984, but it has to be done manually 
> for each map.
> I'm not sure that may maps have a known Mapserver projection.
>
> I'm using this:
>     PROJECTION
>         "init=epsg:26915"
>         "proj=latlong"
>         "ellps=WGS84"
>         "datum=WGS84"
>     END
>
>
> Thanks!
>
> Daiane Fraga
>
>
>
>
> ---------- Forwarded message ----------
> From: *Fuchs Juan Carlos* <jfuch at indec.mecon.gov.ar 
> <mailto:jfuch at indec.mecon.gov.ar>>
> Date: 2010/11/12
> Subject: RE: [mapserver-users] Gauss-Krüger
> To: Daiane Fraga <daiane.a.fraga at gmail.com 
> <mailto:daiane.a.fraga at gmail.com>>
>
>
> Hi Daiane
> You have to find in Prij.4 the right EPSG code for your maps
> in wich country / region are you interested?
> yust to sart with ...
> in the .map you have to insert two groups of code
> in the header (first zone) goes the poyection of the map you are producing
> PROJECTION
>   "init=epsg:heregoesyourcode"
> END
> for each Layer you call to build the map
> Layer
> ....
> PROJECTION
>   "init=epsg:heregoesyourcodeof thesourcelayer"
> END
> ....
> end
> hope it help someway
> Cheers
> JC
>
>     -----Mensaje original-----
>     *De:* Daiane Fraga [mailto:daiane.a.fraga at gmail.com
>     <mailto:daiane.a.fraga at gmail.com>]
>     *Enviado el:* Viernes, 12 de Noviembre de 2010 12:03 p.m.
>     *Para:* mapserver-users at lists.osgeo.org
>     <mailto:mapserver-users at lists.osgeo.org>
>     *Asunto:* [mapserver-users] Gauss-Krüger
>
>     Hello,
>
>     Did someone have any problems using Mapserver with Gauss-Krüger?
>     I know that Mapserver is compatible with proj.4 library and the
>     proj.4 library supports Gauss-Krüger. But I dont know how to use it.
>     Somebody could help me?
>
>     Thanks.
>
>     Daiane
>
>
>
>
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