Fix choropleth horizontal line artifacts on projected maps#668
Merged
cvanelteren merged 2 commits intomainfrom Mar 30, 2026
Merged
Fix choropleth horizontal line artifacts on projected maps#668cvanelteren merged 2 commits intomainfrom
cvanelteren merged 2 commits intomainfrom
Conversation
Use Cartopy's project_geometry() instead of transform_points() for choropleth polygon projection. transform_points() projects vertices independently without geometric awareness, so polygons crossing the antimeridian (e.g. Russia) produce path segments that jump across the entire map, rendering as visible horizontal lines. project_geometry() properly splits and clips polygons at projection boundaries before converting to matplotlib paths, eliminating the artifacts on all projections (Robinson, Mercator, Mollweide, etc.).
Codecov Report❌ Patch coverage is
📢 Thoughts on this report? Let us know! |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
Fix an issue where choropleths were not rendering properly for anti-meridian plots.