FIX: Change PlateCarree vector handling #1920
Closed
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
If a PlateCarree projection is used for transforming vectors, users likely have their data in longitude/latitude for the locations and the measurement of the field is in North/South. To handle this situation with PlateCarree requires an additional scaling by the latitude of the point. This also requires some additional care for handling points near the pole when applying this scaling.
I haven't updated the image tests yet, as I thought it might be easiest to leave them failing for now so people can download the diff and see what they look like. Overall, I think this is an improvement, but it comes at the cost of special-casing the PlateCarree transform. We could also add a keyword argument 'latlon=True', or something similar to keep this as an opt-in and not change any of the old behavior.
closes #1179