[QGIS-Developer] projected CRS

[Stefan Giese (WhereGroup)]

Thank you Nyall

for clarifying. After sending my answer I realized that there can be 
projection which are not registered and have an official code

Best

Stefan

Am 14.10.2021 um 02:49 schrieb Nyall Dawson:
> On Wed, 13 Oct 2021 at 20:10, Stefan Giese (WhereGroup)
> <stefan.giese at wheregroup.com> wrote:
>> in python I would do it like this one:
>>
>> l = iface.activeLayer()
>> if l.crs().authid() != "":
>>      print(l.crs().authid ())
>> else:
>>      print("No projection")
> This isn't quite right -- e.g. a geographic CRS like WGS 84 will still
> have an authid ("EPSG:4326"). As Etienne pointed out .isGeographic()
> is the correct way to test that.
>
> I think here you might be trying to check instead if the layer has a
> valid CRS set (as opposed to "no CRS set"), which should be tested
> instead by:
>
> if not l.crs().isValid():
>       print("No CRS set")
>
> (Also noting that a perfectly valid CRS may not have an authid if it
> came from a custom wkt definition and isn't matched to any official
> registry entry)... phew!
>
> Nyall
>
>
>> Am 13.10.2021 um 11:50 schrieb pierluigi de rosa:
>>
>> Dear all,
>>
>> mayble a very simple question.
>> Is it possible to check quickly if a layer has a projected CRS or not?
>> in QgsCoordinateReferenceSystem I have not found a method able to do that check.
>> Thanks for your attention
>> Pierluigi
>>
>> --
>> Ing. Pierluigi De Rosa (PhD in Earth Science)
>> Contract Professor of Geographic Information System at University of Perugia
>> cel: 3497558268 / fax: 075 7823038
>> skype: pierluigi.derosa
>>
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>> --
>> Mit freundlichen Grüßen
>> Stefan Giese
>> Projektleiter/Consultant
>>
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-- 
Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant
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