Turfjs / Turfjs/turf

@turf/centroid does not take the earth curvature into account

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@turf/centroid
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]);

image

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First steps

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  4. 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

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