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

[Bernhard Reiter]

Hi Daniel,

The name of the data files your mentioned hint that the data is
available in shapefile-format. There are several methods to look
at shapefiles. GRASS can import them. mapserver can use them.

I suggest openmap or sketch (including geo-object plugin)
to look at them first. 

The RT90 seems to be a datum based on Bessel 1841 used with 
Transverse Mercator (Gauss-Krüger) projects.
I am not sure if GRASS supports this directly, but is also might not
be necessary depending on your task.

If you only want to create nice looking maps without serious GIS
analysis sketch might be your best bet.
If you need serious GIS you should go with GRASS, but this will
require some learning as gis are not used for simple tasks.

Bernhard

On Thu, Sep 13, 2001 at 01:45:22PM +0200, Daniel Tourde wrote:
> 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
> -- 
> ***********************************************************************
> 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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