[Qgis-user] On-the-Fly Projections Versus Manual Re-projections

[Nicolas Cadieux]

Hi,
Indeed, in QGIS 3, on the fly is default. You can change that in the project properties by going to project/properties/CRS select No Projection.  It’s not exactly like turning off on the fly in QGIS 2 it does help when trying to trouble shoot projections or if you want to mesure distances in a Euclidian space.

Good call.
Nicolas



>> Le 1 nov. 2018 à 15:58, Fernando M. Roxo da Motta <petro at roxo.org> a écrit :
>> 
>> Em qui, 2018-11-01 às 13:02 -0400, Aj Hollenbach escreveu:
>> Hi QGIS Community,
>> 
>> I have what I believe may be a fairly straight-forward question on
>> coordinate reference systems and projections in QGIS. I am currently
>> working on some maps in the southern Philippines and thus have set my
>> "project-level" coordinate reference system (CRS) to EPSG 3125. I have
>> noticed, however, that when I open a vector file or raster file that is
>> loaded into this project, the CRS still reads as EPSG 4326. Thus, my
>> question is whether it is necessary to "manually" go in and change the
>> EPSG of each new layer to EPSG 3125 (i.e. use the Warp Tool for a raster
>> file or the "Reproject Layer" tool for a vector file), or if there is
>> any issue with leaving them as EPSG 4326. I note that I am not having
>> any issues "seeing" the newly added files--meaning the "on-the-fly"
>> projection seems to be working fine. Appreciate any insights that you
>> might have.
> 
>  Well, Nicolas gave you an answer tha may apply to your case.
> 
>  By the the side, it seems that Qgis3 does on the fly re-projection
> automagically, it seems that there is no way to turn this off.  Even so,
> when you look to layer properties it will state what thw original
> projection was.   That is, if your layer was produced in EPSG 4326 and is
> loaded in a EPSG 3125 project, Qgis3 will re-project it to the project
> reference system, but keep informing you the original projection of the
> layer.
> 
>  In this case you most probably will have to do nothing.
> 
> 
>  HTH.
> 
> 
>> 
>> Regards,
>> Allen
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> 
> 
>  Roxo
> 
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