Function polygonRingArea

polygonRingArea<M extends Properties = Properties>(
coords: VectorLineString<M>,
planetRadius: number,
): number
Calculate the approximate area of the polygon ring if were it projected onto the planet. Note that this area will be positive if ring is oriented counter-clockwise, otherwise it will be negative.

Reference: Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion Laboratory, Pasadena, CA, June 2007 https://trs.jpl.nasa.gov/handle/2014/40409
Type Parameters
- M extends Properties = Properties
Parameters
- coords: VectorLineString<M>
  ring Coordinates in lon-lat space
- planetRadius: number
  the radius of the planet (Earth by default)
Returns number
- The approximate signed geodesic area of the polygon in square meters.