Fix spelling of Potsdam datum

[dg0yt]

No description provided.

[dg0yt]

This is required to fix existing PROJ specs for German Gauß-Krüger with +datum=potsdam. Otherwise PROJ just reports proj_create: unknown datum potsdam.

Using +datum=postdam doesn't work either, due to an "unknown elliptical parameter". So I don't see how I could work around this bug from the application side.

[rouault]

we'll apply it after 6.2.0 release, unless @kbevers sees that as a RC blocker ?
You can probably workaround by replacing +datum=potsdam by +ellps=bessel +nadgrids=@BETA2007.gsb since that's actually what the datum is expanded into

[dg0yt]

You can probably workaround by replacing +datum=potsdam by +ellps=bessel +nadgrids=@BETA2007.gsb since that's actually what the datum is expanded into

Thanks, I will try that later.

I'm under the impression that some API use cases are not covered well by unit tests. I came to this bug with the new API because with the old API, we face an issue with +init=epsg:2056 (CH1903+).

[dg0yt]

You can probably workaround by replacing +datum=potsdam by +ellps=bessel +nadgrids=@BETA2007.gsb since that's actually what the datum is expanded into

👍 Works for me.