RE: RE: RE: [mapserver-users] Gauss-Krüger

[Daiane Fraga]

Hi,

Thanks for the answers!
I'll gather all the information and I'll try to adapt to my problem.
I'll post more information about the problem when I get some results or when
I get more information.
Thank you very much for the help!

Daiane Fraga




---------------------------------------------
From: Jan Hartmann <j.l.h.hartmann at uva.nl>
Date: 2010/11/16
Subject: Re: [mapserver-users] Gauss-Krüger
To: Daiane Fraga <daiane.a.fraga at gmail.com>
Cc: Fuchs Juan Carlos <jfuch at indec.mecon.gov.ar>,
mapserver-users at lists.osgeo.org


 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coordinate system outdated (the maps are dated from 1908).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>
Date: 2010/11/12
Subject: RE: [mapserver-users] Gauss-Krüger
To: Daiane Fraga <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]
*Enviado el:* Viernes, 12 de Noviembre de 2010 12:03 p.m.
*Para:* 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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