Enable 'on the fly' CRS transformation in QGIS 3?

Question

In QGIS 2.8 there is a clear button to 'enable on the fly CRS transformation' in the "project properties" for a new project. Seen here:

But in QGIS 3.0, I cannot find it to save my life.

Can anyone help?

I couldn't comment on the comment from gisnside but I found it to be very useful +1 if I could. Also I agree with AnsreasK, being able to turn off OTF would be very help to quickly identify layers with different projections as I do this often. — Scott, Mar 2, 2019 at 0:53
It would be great if someone could update the documentation and tutorials for 3.x that still refer to enabling OTF transformations. docs.qgis.org/3.4/en/docs/user_manual/working_with_projections/… — Adrian Birch, Mar 23, 2019 at 11:58
I have used on the fly reprojections for a few years with QGIS and it always worked very well until the NOOSA release. Now when I bring in raster files they don't reproject to the county coordinate systems that I have used for years. They used to in older versions of QGIS. It doesn't seem to matter if I bring in the rasters from and ESRI server or a local server. Has any one else had this problem or found a solution other than installing an older version of QGIS? — stephennicholson, May 2, 2019 at 16:44
This does not really answer the question. If you have a different question, you can ask it by clicking Ask Question. You can also add a bounty to draw more attention to this question once you have enough reputation. - From Review — whyzar, May 2, 2019 at 19:07

Andre Silva · Accepted Answer · 2018-05-31 15:07:11Z

20

In QGIS 3.0, on-the-fly (OTF) reprojection is always enabled (https://issues.qgis.org/issues/11644).

Andre Silva

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answered May 7, 2018 at 22:15

ndawson

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There is no option anymore to deactivate the the OTF? This is crazy! For a GIS program this is ridiculous.
– AndreasK
Nov 19, 2018 at 13:41
@AndreasK Can you list any cases when OTF reprojection should NOT be used?
– Aurus Huang
Nov 26, 2018 at 0:57
15

Every time when there is the possibility that your layers are in a different coordinate system! With the OTF ON&OFF you could immediately see that you have layers with different coordinate systems in your project. As I gave courses to hundreds of people, I know that people look for super-easy ways. That said QGIS3 is in many many way more complicated (more clicks) than QGIS2. The new checkbox (instead of OTF!!!) --> "No Projection" is almost unexplainable and doesn't make sense in 99.999% of all cases.
– AndreasK
Nov 26, 2018 at 18:31
1

Deactivating this option is good to see the source coordinates : I support the fact it's very useful. @AndreasK the workaround is just to select "no projection" for your project ;)
– gisnside
Feb 27, 2019 at 14:00

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