Fwd: Re: [GRASS-dev] VTK export for lat-long locations

["Sören Gebbert"]

-------- Original-Nachricht --------
Datum: Tue, 06 Mar 2007 16:06:18 +0100
Von: "Sören Gebbert" <soerengebbert at gmx.de>
An: Benjamin Ducke <benjamin.ducke at ufg.uni-kiel.de>
CC: 
Betreff: Re: [GRASS-dev] VTK export for lat-long locations

Hi Benjamin,
please dont use the vtk export modules with lat/lon projections.
The vtk export modules in grass are not 
usable with lat/lon projections right now.
I think i should put this info to the html docs.

The lat/lon coordiantes are used to define the coordinates for each point.
VTK interpret these coordinates as planimetric and not as lat/lon.
This is not that bad for x,y coordinates, but for the height (z coordinate).
Because if x and y lat/lon coordiantes are of type [54.001/34.002] and the
height varies from 0m - 500m you will get a senseless result.

I still dont know exactly how to implement a meaningful 
lat/lon ->planimetric coordinate transformation to get rid 
fo this behaviour.

Any suggestions are welcome.

Best regards
Soeren


-------- Original-Nachricht --------
Datum: Tue, 06 Mar 2007 15:57:17 +0100
Von: Benjamin Ducke <benjamin.ducke at ufg.uni-kiel.de>
An: GRASS devel <grass-dev at grass.itc.it>
CC: 
Betreff: [GRASS-dev] VTK export for lat-long locations

> Hi everyone,
> 
> I just tested r.out.vtk in a lat-long location and all I got when I
> loaded the VTK file in Paraview (2.6.0), was a single line of data
> projecting through the origin of the coordinate system.
> 
> Does anyone have any experiences with VTK/Paraview and lat-long data?
> 
> Thanks,
> 
> Benjamin
> 
> 
> -- 
> Benjamin Ducke, M.A.
> Archäoinformatik
> (Archaeoinformation Science)
> Institut für Ur- und Frühgeschichte
> (Inst. of Prehistoric and Historic Archaeology)
> Christian-Albrechts-Universität zu Kiel
> Johanna-Mestorf-Straße 2-6
> D 24098 Kiel
> Germany
> 
> Tel.: ++49 (0)431 880-3378 / -3379
> Fax : ++49 (0)431 880-7300
> www.uni-kiel.de/ufg
> 
> _______________________________________________
> grass-dev mailing list
> grass-dev at grass.itc.it
> http://grass.itc.it/mailman/listinfo/grass-dev

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