Dependencies free QGIS ellipsoidal area calculation reproduced in JavaScript.
import { calculateArea, geojsonArea } from '@nextgis/area';const area = geojsonArea(geojson);const area2 = calculateArea([ [51.82, 63.8], [43.48, 55.62], [75.38, 59.13], [51.82, 63.8], // the first and last positions MUST contain identical values]);
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Dependencies free QGIS ellipsoidal area calculation reproduced in JavaScript.
Example