@turf/centroid does not take the earth curvature into account
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- Dominant language
- TypeScript
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Description
The implementation of @turf/centroid is not taking the earth curvature into account.
Thus, the result is wrong when calculating the centroid of "big" polygons, or at high altitudes.
Reproduced with Turf version 7.1 running at https://turf-sandbox.netlify.app/ with the following code :
const p = turf.point([-30., 50.]);
const circ = turf.circle(p, 4000)
const p2 = turf.centroid(circ)
return turf.featureCollection([p,p2]);
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
Start at the @turf/centroid package entry point and reproduce the reported Turf 7.1 example with the large circle. Determine how centroid is currently calculated and define the expected result for large polygons or high-altitude cases; done means the centroid accounts for earth curvature and the existing behavior remains covered by tests.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, typescript
- Domain
- data
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100