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in a coordinate system outdated (the maps are dated from 1908).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* <jf...@indec.mecon.gov.ar
<mailto:jf...@indec.mecon.gov.ar>>
Date: 2010/11/12
Subject: RE: [mapserver-users] Gauss-Krüger
To: Daiane Fraga <daiane.a.fr...@gmail.com
<mailto:daiane.a.fr...@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.fr...@gmail.com
<mailto:daiane.a.fr...@gmail.com>]
*Enviado el:* Viernes, 12 de Noviembre de 2010 12:03 p.m.
*Para:* mapserver-users@lists.osgeo.org
<mailto:mapserver-users@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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