mapbox / mapbox/mapbox-gl-js

Abrupt colorGreenspace changes at zoom level 11

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auto-triaged bug :lady_beetle:
Dominant language
TypeScript
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Description

### mapbox-gl-js version

v3.19.0

### Browser and version

chrome 145.0.7632.117

### Expected behavior

There should be less of a color change when zooming at level 11. The transition in v3.9.3 and v3.11.1 seem to have a smooth color fade, while v3.19.0 does not.

https://github.com/user-attachments/assets/9fe6b24f-db2e-430b-8d1c-f1a19c9b52ff

https://github.com/user-attachments/assets/7fef75c6-611b-4af3-b720-86468a2a3782

As a temporary fix, I added a zoom-based interpolation to control the opacity of `colorGreenspace`

map.on('zoom', () => {

const transitionZoom = map?.getZoom() ?? 3.5;

if (baseMapStyle !== 'satellite') {
const minOpacityValue = 0.25;
const maxOpacityValue = 0.9;
const startZoom = 6;
const endZoom = 11;

const zoomInterpolationFactor = Math.min(
1,
Math.max(0, (transitionZoom - startZoom) / (endZoom - startZoom)),
);
const opacity = Number(
(
maxOpacityValue -
zoomInterpolationFactor * (maxOpacityValue - minOpacityValue)
).toFixed(2),
);

map?.setConfigProperty('basemap', 'colorGreenspace', `hsla(115, 60%, 84%, ${opacity})`);
}
});

### Actual behavior

The colors change abruptly at zoom level 11. Seems to happen when the map adds more detail.

https://github.com/user-attachments/assets/454e0054-3e22-421e-b382-5aa5370e2125

https://github.com/user-attachments/assets/43f1b599-9ede-474f-a0e3-9d64dd52046b

### Link to the demonstration

_No response_

### Steps to trigger the unexpected behavior

1. zoom to level 11
2. Zoom in and out where the map adds more detail

### Relevant log output

```shell

```

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

Reproduce the abrupt colorGreenspace change in mapbox-gl-js v3.19.0 by zooming around level 11, then compare it with v3.9.3 and v3.11.1. Trace how basemap colorGreenspace and added map detail are handled across that zoom boundary; done means the transition is as smooth as the expected behavior shown in the issue.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
computer-graphics, 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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