[Qgis-developer] Shapefile: prj vs qpj (CRS info)

[benoit-3 at bc-consult.com]

 Hi John,


 On Tue, 1 Mar 2011 10:35:48 -0800, "John C. Tull" <jctull at gmail.com> 
 wrote:
> Hi Benoit,
>
> Has a ticket been filed?


 Not yet. Will do it now.

 And to confirm, yes, it only appears in Trunk (since at least the last 
 15 revisions, not sure exactly). Versions <= 1.6 works as expected.

 Regards,
 Benoit


>
> Cheers,
> John
>
> On Mar 1, 2011, at 9:53 AM, Benoit wrote:
>
>> Hi John,
>>
>> Thanks for your report and confirmation of this behaviour.
>>
>> I'm on windows7 64bits at work and winXP 32bits at home. On both it 
>> is OSGeo4W trunk. So it seems it is not OS dependent.
>>
>> Regards,
>> Benoit
>>
>>
>> On 01 Mar 2011, at 18:56, "John C. Tull" <jctull at gmail.com> wrote:
>>
>>> Hi Benoit,
>>>
>>> I can confirm this behavior for me as well. It seems to have crept 
>>> into trunk in the past month or two. I have been banging my head on 
>>> this as it is very frustrating. Shapefiles with associated prj, gdal 
>>> recognizes the CRS, but QGIS seems to ignore it.
>>>
>>> Let's look at the OS we are using. I am on OS X with William's 
>>> frameworks. I build following the OS X build instructions. Any chance 
>>> you are on the same build environment or is it another OS?
>>>
>>> Cheers,
>>> John
>>>
>>> On Mar 1, 2011, at 8:41 AM, Benoit wrote:
>>>
>>>> Hi Paolo,
>>>>
>>>> I agree with you.
>>>>
>>>> Furthermore, the behaviour should depend on the option selected in
>>>> Settings/Options->CRS tab:
>>>>
>>>> Option: "Prompt for CRS" should ask the user to define the CRS of 
>>>> the
>>>> loaded file if, and only if, it is not defined. Unfortunately if 
>>>> you
>>>> only have a prj file, QGIS asks you to define the CRS. QGIS only
>>>> recognises the qpj file.
>>>>
>>>> Option: "Project wide default CRS will be used". Here again the 
>>>> prj file
>>>> is not recognised and the shapefile is given the project CRS. It 
>>>> is fine
>>>> when both have the same CRS but lead to wrong location if they 
>>>> don't and
>>>> "on-the-fly" projection has been enabled.
>>>>
>>>> Option: "Global default CRS displayed below will be used". Again, 
>>>> the
>>>> prj file is not recognised and the shapefile is given the global 
>>>> default
>>>> CRS.
>>>>
>>>> I have this problem when I want to import a shapefile (in a 
>>>> projected
>>>> CRS) into a project having a Google Mercator CRS and OTF enabled.
>>>>
>>>> Can this be confirmed by someone, or am I doing something wrong?
>>>>
>>>> Regards,
>>>> Benoit
>>>>
>>>>
>>>>
>>>> On 01/03/2011 16:57, Paolo Cavallini wrote:
>>>>> Il giorno mar, 01/03/2011 alle 08.26 -0500, 
>>>>> benoit-3 at bc-consult.com ha
>>>>> scritto:
>>>>>
>>>>>> Yes, there is a CRS definition difference between prj and qpj.
>>>>>> But, if you only have a prj file you can rename it to qpj. QGIS 
>>>>>> does
>>>>>> not complain and displays the shapefile at the correct location.
>>>>>> So the way to go forward, at least for me, would be to rename 
>>>>>> all the
>>>>>> shapefiles *.prj to *.qpj in order to use them in QGIS.
>>>>> This is not the correct behaviour: QGIS should use qpj when 
>>>>> present,
>>>>> otherwise prj, if nothing is available it should apply the 
>>>>> default, as
>>>>> chosen by the user from the menu Options.
>>>>> If the behaviour you describe is confirmed (in my case it is 
>>>>> not), then
>>>>> it's a bug.
>>>>> All the best.
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>>>