EUDR GeoJSON warning: polygon winding order is wrong
Exterior rings should run counterclockwise and holes clockwise — the right-hand rule. Many tools export the opposite.
What the check requires
A warning — it does not block submission, but it can cause real problems downstream.
Why files fail this check
Winding order is invisible on a map, so exporters get it wrong constantly: shapefile conventions are the reverse of GeoJSON, and hand-built files rarely think about vertex direction at all.
Consumers differ in how strictly they read winding, so a wrong-way ring may render fine in one tool and misbehave in another — which is exactly the kind of ambiguity a filing should not carry.
How it gets fixed
The repair reverses the order of the vertices — no vertex moves, the boundary is identical. It is deterministic, so the free check applies it automatically on upload and records it in the repair log.
One edge case is left alone: a ring that spans more than half the globe (straddling the antimeridian) cannot be judged by the standard orientation test, so it is flagged for your attention instead of rewound.