[QGIS-Developer] projected CRS

[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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