mapbox / mapbox/mapbox-gl-js

Cylindrical Albers projections break with parallels +-50

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#11,232 1 comment 0 reactions 0 assignees View on GitHub

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bug :lady_beetle:
Dominant language
TypeScript
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Description

Steps to Trigger Behavior
  1. Set the map projection to Albers with cylindrical parallels greater than 50 and less than -50 (e.g. [70, -70])
    projection: {
        name: 'albers',
        parallels: [-80, 80]
    }
Expected Behavior

The map should fill the screen, be legible and wrap as other cylindrical projections do.

Actual Behavior
Screen Shot 2021-11-04 at 7 13 05 PM

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the Albers configuration with cylindrical parallels such as [-80, 80], then compare its rendering with the other cylindrical projections mentioned in the issue. Done means the map fills the screen, remains legible, and wraps correctly for parallels beyond ±50.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
frontend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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