EUDR GeoJSON warning: declared area does not match the polygon
The Area property and the area measured from the polygon geometry tell two different stories — one of them is wrong.
What the check requires
A warning — it does not block submission, but it can cause real problems downstream.
Why files fail this check
The usual causes: an Area value copied from an old survey while the boundary was re-mapped, a unit mix-up (acres or square metres declared as hectares), or a geometry defect that inflates or shrinks the measured area.
The divergence does not block submission, but it is exactly the kind of inconsistency a competent authority notices — a filing should not contradict itself.
How it gets fixed
Only you know which number is right, so nothing is changed automatically. The free check shows the measured hectares for every polygon on the map — compare it with your declared value and correct whichever side is wrong at the source.
If the declared value was in different units, convert it to hectares; if the boundary is wrong, re-map the plot.