[Freegis-list] How to display Swedish RT90 data and convert it?

[Daniel Tourde]

Hello,

I am a newbie to the GIS world and to FreeGIS.
I have a "simple" problem but i don't know how to solve it. Maybe
someone can give me some hints or advice.

I am living in Sweden and I have access to digital Swedish maps
(topographic scale 1:50000). As far as I understood it uses the Swedish
topographic system called RT90. All the details about this format are
given in this web page:
http://www.lm.se/geodesi/refsys/rt/rt_projections.htm

The data I have are of the following type:
dk_10gso.dbf  dk_10gso.sbn  dk_10gso.sbx  dk_10gso.shp  dk_10gso.shx
...



Now I would like to visualise, concatenate (maps are pretty small and I
need to merge some of these maps) and export these data to other
formats. 
The program who would use these data can import AutoCAD DXF files,
Polyline TXT File (CAD Layer) and Terrain 3CD, 3TX files (Micropath
type).


I have build up Grass5pre1 on my Linux box but I am not really sure it
is the right tool and I have difficulties using it (to import and export
data, visualisation... ).
Could anyone help me with the first steps and tell me which program
would be the best fitted to my need and how I could proceed.

Thanks in advance



			Daniel Tourde
-- 
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Daniel TOURDE                             E-mail : daniel.tourde at foi.se
                                             Tel : +46 (0)8-55 50 43 44
                                        Cellular :  +46 (0)70-849 93 40
   FOI, Swedish Defence Research Agency; Aeronautics Division - FFA
       Dept. of Wind Energy and Aviation Environmental Research
SE-172 90 Stockholm, Sweden                     Fax : +46 (0)8-25 34 81
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