Ouranosinc / xscen / 17412019148

90%

push

github

Rotate vectors - get crs (#635)

<!-- Please ensure the PR fulfills the following requirements! -->
<!-- If this is your first PR, make sure to add your details to the
AUTHORS.rst! -->
### Pull Request Checklist:
- [ ] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features).
- [x] (If applicable) Tests have been added.
- [x] This PR does not seem to break the templates.
- [x] CHANGELOG.rst has been updated (with summary of main changes).
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added.

### What kind of change does this PR introduce?
Two new functions in `xs.spatial`
* `rotate_vectors` to rotate vectors from their native grid axes to
actual S-N W-E axes. Mostly useful for wind that comes out of some
models. Can also do the opposite rotation.
* `get_crs` to get a cartopy crs from a grid mapping variable. This is
only temporary, waiting for my PR in cartopy: SciTools/cartopy#2548.

### Does this PR introduce a breaking change?
No.

### Other information:
@aslibese fyi

40 of 41 new or added lines in 3 files covered. (97.56%)

4098 of 4649 relevant lines covered (88.15%)

6.08 hits per line