SciTools
Compatibility with shapely 2.0 (remove usage of lgeos)
Rationale
See https://github.com/SciTools/cartopy/issues/2076.
It is actually relatively easy to remove the usage of shapely.geos.lgeos, which is removed in Shapely 2.0, as a first step to make cartopy compatible with Shapely 2.0 (without making use of new features).
I think this should actually be a safe change to include in a 0.21.1 bug-fix release, in case that would be planned.
Now, while this is a necessary change to run the test suite with Shapely 2.0, there are still some other failures, but for things that potentially can be fixed on Shapely's side (see https://github.com/SciTools/cartopy/issues/2076#issuecomment-1243294605 for details)
@jorisvandenbossche, thanks for the patch! I agree that this seems reasonable for a patch release. Can you revert all the pins throughout the documentation? https://github.com/SciTools/cartopy/commit/ad1ec1a4b901556a2111d6f87dbd09d9b4f920a2
Cartopy was not compatible with MPL 3.6 or Shapely 2.0, so we were trying to get ahead of the MPL 3.6 release. I am not opposed to turning this around for a quick v0.21.1 tag to remove the pin on Shapely though so more people can test.
Reverted the pins (and all required PRs on the Shapely side are now fixed)
I dug into the doc failure and it's from Matplotlib 3.6: matplotlib/matplotlib#24053.
The Shapely team just published version 2.0b1, so this might be a good point in time to publish this Cartopy improvement and (let the community) test them together. 😄
Yes, shapely 2.0b1 should contain all fixes to have this working.
You could replace the pip install git+https://github.com/shapely/shapely.git@main with pip install --pre