[Qgis-user] How QGIS handles on-the-fly projection?

[Régis Haubourg]

Hi ,

the render in QGIS is always done on the fly, there is no caching of 
prerendered data, except for online webservices.

PROJ is indeed the library doing the job.

Régis

On 27/02/2024 14:00, Ionut Ungurianu via QGIS-User wrote:
> Hi!
>
> I’m looking to understand  in a more advanced way how QGIS handles on-the-fly projection.
> In my case I set the project crs in epsg:3857 and I have a raster layer in epsg:4326. In this case what is happening with the layer?
>
> I know that it’s based on PROJ, but I’m wondering what is actually happening in the back-end, what is happening in the map canvas, how is the layer render, is being resampled every time you pan the map or do zoom in/out ...
>
> So, if someone can help with a detailed explanation, I would really appreciate it.
>
> Thanks in advance!
>
> All the best!
> Ionut
> _______________________________________________
> QGIS-User mailing list
> QGIS-User at lists.osgeo.org
> List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20240228/30df2b51/attachment.htm>