Undistort to mercator stretches heatmap blobs
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- Dominant language
- TypeScript
- Stars
- 12.4k
- Forks
- 2.4k
- PR merge metrics
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Description
**mapbox-gl-js version**: 2.6.0-beta.2
**browser**:Any
### Steps to Trigger Behavior
1. Use `http://localhost:9966/debug/heatmap.html`
2. Set Projection `map.setProjection('equirectangular')`
3. Zoom in on high latitudes
### Expected Behavior
heatmap blobs maintain circular shape
### Actual Behavior
They get stretched to ellipses
https://user-images.githubusercontent.com/1449257/140562263-44920683-eb30-4a85-bb39-6ac8c9e93b0a.mov
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the issue from debug/heatmap.html using map.setProjection('equirectangular'), then zoom at high latitudes and compare the heatmap blobs with the expected circular shape. Trace the heatmap rendering and projection path to identify where the stretching occurs; done means blobs remain circular under this projection.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, typescript
- Domain
- data-visualization, frontend, web-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100