[QGIS-Developer] Projects without a CRS

[Harrissou]

Hi Andreas

I think there are some (partial?) answers in docs, in case you didn't read it yet.
https://docs.qgis.org/testing/en/docs/user_manual/introduction/qgis_configuration.html#crs-properties

Regards,
Harrissou

Le 1 juillet 2019 08:46:03 GMT+02:00, Andreas Neumann <a.neumann at carto.net> a écrit :
>Hi, 
>
>I am wondering about projects without a CRS. While a new project now
>always comes with a CRS (depending on the global CRS settings), the
>user
>can still explicitly disable a definition of a CRS in Menu "Project"
>-->
>"Properties" --> "CRS" 
>
>I have the following questions about projects without a CRS: 
>
>- what are the restrictions/limitations of projects without a CRS? 
>
>- assuming that a layer has a CRS (e.g. a Postgis layer that has a CRS)
>is loaded into a project that explictly has no CRS set - does QGIS
>still
>know the CRS of the Postgis layer or would it treat it as a CRS-less
>layer? 
>
>- does it still make sense to support projects without a CRS? If yes,
>what are the use cases? 
>
>- will it still be possible to have projects without a CRS or will this
>one day be deprecated 
>
>I personally do understand that it is not a good idea to have projects
>with no CRS defined, but I am trying to understand and convince my
>colleagues at my workplace that projects without a CRS are an absolute
>nogo. But maybe I am wrong and it still makes sense to support projects
>without a CRS. 
>
>One use case I could think of for projects without a CRS, is using QGIS
>for something that is planar, but not geographic in nature, e.g. a
>non-GIS topic, such as examining an image (let's say the enlarged view
>of an electron microscope of some small thing) where the user might
>want
>to "map" certain characteristics of the image, but the object itself is
>"mobile" (can move around) and is not fixed to a fixed position of the
>earth. 
>
>What are your thoughts about projects without a CRS? 
>
>Greetings, 
>
>Andreas

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