Function polygonArea

polygonArea<
    M = Record<string, unknown>,
    D extends Properties = Properties,
    P extends Properties = Properties,
>(
    polygon:
        | VectorPolygon<D>
        | VectorPolygonGeometry<D>
        | VectorFeature<M, D, P, VectorPolygonGeometry<D>>,
    planetRadius?: number,
): number
Find the area of a polygon. Assumes geometry is in Lon-Lat space
Type Parameters
- M = Record<string, unknown>
- D extends Properties = Properties
- P extends Properties = Properties
Parameters
- polygon:
      | VectorPolygon<D>
      | VectorPolygonGeometry<D>
      | VectorFeature<M, D, P, VectorPolygonGeometry<D>>
  the polygon
- planetRadius: number = EARTH_RADIUS
  the radius of the planet (Earth by default)
Returns number
- The approximate signed geodesic area of the polygon in square meters.