[Qgis-user] proj file and QGIS

["António M. Rodrigues"]

Hi,

If I am not mistaken (and this is only from experience), the PROJ does  
not "need" to have the correct infromation about the projection / 
coordinate system for a specific shapefile to be displayed correctly

When this happens, the solution I've used is to trash the PROJ.  
Afeter, I use "vector->Data Management Tools->Define current  
projection" and tell QGIS what the projection is.

This is necessary when exporting to new projection. Otherwise QGIS  
will (naturally) make a mess of things.

Only from intuition, I would say QGIS cannot guess the projection of a  
given shapefile. It just reads coordinates of objects. In theory we  
can call and projection whatever we want and define it how we wish.

Hope this helps,
António

On Feb 22, 2010, at 11:53 AM, Werner Macho wrote:

> To all developers! correct me if i am wrong.
>
> It seems to me that sometimes QGIS does not "understand" the proj  
> file if it comes from ESRI products ..
> I have had a simmilar problem with some data here when Otto Dassau  
> helped me cleaning out the problem ..
>
> But to be honest - I'm completely with you when you say QGIS should  
> at least set the projection somehow automatically.
> IIRC we had such discussions a few month ago .. So probably this is  
> a topic for the hackfest in Pisa?
> Paolo? What do you think about it?
>
> regards
> Werner
>
> Am 22.02.2010 12:32, schrieb Yves Jacolin:
>> Hello,
>>
>> It seems i get a strange (for me) behaviours with QGIS.
>>
>> Does QGIS is supposed to read proj file and use it as projection  
>> data when
>> opening a shapefile?
>>
>> I have never seen QGIS get the correct projection for a shapefil,  
>> but it seems
>> QGIS should do it. Am I wrong?
>>
>> Thanks,
>>
>> Y.
>>
>
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