[Qgis-developer] Unknown CRS problem

Micha Silver micha at arava.co.il
Tue Jan 11 04:39:17 EST 2011


On 11/01/2011 11:31, Marco Hugentobler wrote:

>> 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 ;-(
> True, your suggestion to add the possibility to set a default CRS for the map
> would be useful.
>
> There will always be problems at some point if the layers / map CRS are not
> properly set. I just want to avoid more complications compared to the current
> situation if this is not the case ( because it happens so frequently in
> practice ).

The ArcMap method of setting the project CRS based on the 
first layer that the user loads might be best. It's a 
"dumbed-down" solution that assumes the user doesn't 
understand what he's doing, but it will nicely cover those 
cases where all the data is in only one CRS.


> Regards,
> Marco
>
>
> Am Dienstag, 11. Januar 2011, um 10.05:18 schrieb Micha Silver:
>> On 11/01/2011 10:19, Paolo Cavallini wrote:
>>> Il giorno mar, 11/01/2011 alle 00.43 +0100, Martin Dobias ha scritto:
>>>> Ideally if all the data from government is in the same CRS, no
>>>> reprojecting will happen - because the project CRS will be the same as
>>>> the CRS of individual layers (thus no warning would be issued).
>>> The problem here is that many organization keep most of their data in
>>> the same projection, but without a .prj file.
>>> 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 ;-(
>>
>> Regards,
>> Micha
>>
>>> All the best.
>


-- 
Micha Silver
http://www.surfaces.co.il/
Arava Development Co.  +972-52-3665918



More information about the Qgis-developer mailing list