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I'm currently performing an analysis in QGIS that involves calculating areas (see this question). In order to do so, I would like to work in an equal area projection, like EPSG:6933. I already set the project as a whole to this CRS in the Properties section.

Now, I'd like to convert all the relevant layers to this CRS. I'm starting off with the base layer - Esri Gray (light). When I do Export, Save as... and set it to EPSG:6933 in the menu (and tick off 'create VRT'), something goes wrong. I get the follow error message when I try to save the layer in the new projection:

                                    enter image description here

The output mode in the Save raster data as... menu was 'Raw data'.

Questions: how should I reproject the base (raster) layer correctly? And do I have to reproject all layers everytime, or is there a way to set the whole analysis in one layer setting?

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  • Since you wont calculate areas for a WMS service, you simply can rely on QGIS' on the fly reprojection.
    – Erik
    Sep 30, 2021 at 9:30
  • @Erik does that mean I don't have to manually reproject the base layer? And which layers do I have to manually reproject to the correct CRS, and which ones not?
    – Max Muller
    Sep 30, 2021 at 9:32
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    You need to reproject the ones you want to analyse - as long as they aren't already in a viable CRS.
    – Erik
    Sep 30, 2021 at 9:48
  • @Erik okay, but how do I reproject the base layer 'one the fly' ?
    – Max Muller
    Sep 30, 2021 at 10:33
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    Download them from OSM and reproject, or digitize them using a fitting CRS.
    – Erik
    Sep 30, 2021 at 11:22

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