[Qgis-user] Need help with changing CRS

[Alexandre Neto]

Hi,

As David said, the key point here is that you should not change the layers'
CRS (unless it's wrong ofc). Keeping the data original CRS and changing the
project CRS will tell QGIS that on-the-fly transformation is needed for
that layer. This will make you layer, originally in EPSG:4326, look like
it's in the project CRS.

Alexandre Neto
User Support
www.qcooperative.net

A quarta, 18/08/2021, 05:19, Brian Gilhuly <brianlgilhuly at gmail.com>
escreveu:

> That did it, thanks.
>
> I think I previously tried changing the layer CRS, then the project.
>
> Brian
>
>
>
> *From:* David Strip <qgis-user at stripfamily.net>
> *Sent:* August 17, 2021 23:21
> *To:* Brian Gilhuly <brianlgilhuly at gmail.com>; qgis-user at lists.osgeo.org
> *Subject:* Re: [Qgis-user] Need help with changing CRS
>
>
>
> I'm not sure exactly what you did, but I am a bit concerned by this:
>
> Then I changed the CRS (layer and project)
>
> Try this:
>
> Start with a new project
>
> Add the Natural Earth Admin boundaries layer
>
> Select File->Properties->CRS
>
> Select Mollweide (or whatever you want), then click Apply.
>
>
>
> Note that we are not touching the CRS for the layer.
>
>
>
> I get a radically different projection than WGS 84 (EPSG:4326).
>
>
> On 8/17/2021 7:45 PM, Brian Gilhuly wrote:
>
> I need a world map on which to display country web statistics and, being
> in Canada, want to avoid projections like Mercator with their northern
> distortions. Something like Mollweide or Robinson is more what I am seeking.
>
>
>
> I downloaded the Natural Earth administrative borders map (WGS84) and
> opened it in QGIS 3.20 as the only layer in a new project. So far, so good.
>
>
>
> Then I changed the CRS (layer and project) to Mollweide (ESRI:54009) and
> the on-screen render changed hardly at all. It didn’t remain unchanged, but
> it still looks very much more like WGS84 than Mollweide. The same happens
> if I try to re-project to Robinson (ESRI:54030) or Winkel-Tripel
> (ESRI:54042).
>
>
>
> So far as I can tell, I have followed all the steps outlined in the online
> manual but there must be something obvious that I am missing.
>
>
>
> Can someone set me straight?
>
>
>
> Thanks,
>
> Brian Gilhuly
>
>
>
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