[Qgis-developer] Unknown CRS problem

[Marco Hugentobler]

Hi Martin

> My idea was that if they have layers with unknown CRS, also the
> project's CRS would be set to unknown. So no reprojection would happen
> and no warnings shown. Even measuring could work to some degree -
> assuming planar coordinates, with unknown units. 

That sounds good to me (no reprojection and no warning shown in case of 
unknown CRS).

Regards,
Marco


Am Dienstag, 11. Januar 2011, um 10.38:56 schrieb Martin Dobias:
> On Tue, Jan 11, 2011 at 10:11 AM, Paolo Cavallini <cavallini at faunalia.it> 
wrote:
> > Il giorno mar, 11/01/2011 alle 11.05 +0200, Micha Silver ha scritto:
> >> > So if they work without reprojection, everything works smoothly, and
> >> > they do not see anything wrong with that.
> >> 
> >> Not entirely correct. As QGIS works now, each new project
> >> starts in Lon/Lat WGS84. If I all my layers are in the same
> >> projected CRS I don't notice any problem *until* I want to
> >> measure something ;-(
> > 
> > You are right, I was unclear: I meant, they do not see any problem if
> > they use other (proprietary) software. In qgis they have to define their
> > default CRS.
> 
> My idea was that if they have layers with unknown CRS, also the
> project's CRS would be set to unknown. So no reprojection would happen
> and no warnings shown. Even measuring could work to some degree -
> assuming planar coordinates, with unknown units. Warnings would be
> issued only when user explicitly does an action where known CRS is
> necessary - e.g. change project CRS, add a layer with different
> (known) CRS. There could be a "learn more" button leading to a brief
> explanation of CRS, projections and why is it good to have them in
> order - we could educate our users :)
> 
> Martin
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-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee