Compute the area of GeoJSON geometries.
Ported to Elixir from mapbox/geojson-area (javascript).
The package can be installed by adding geojson_area to your list of
dependencies in mix.exs:
def deps do
[
{:geojson_area, "~> 0.1.0"}
]
endgeometry_area/1 supports any GeoJSON geometry:
755640.4952324519 = GeoJSON.Area.geometry_area(%{
type: "Polygon",
coordinates: [
[
[139.7755122184753, 35.721064511354726],
[139.76765871047974, 35.71514121326722],
[139.76913928985596, 35.70895612333854],
[139.77330207824707, 35.71014091012367],
[139.7796106338501, 35.71869524495784],
[139.7755122184753, 35.721064511354726]
]
]
})Specialized functions such as ring_area/1, polygon_area/1 or
multi_polygon_area/1 can work directly on coordinates:
3571505.5755534363 = GeoJSON.Area.ring_area([
[139.7643756866455, 35.65645937572578],
[139.78179931640625, 35.633720988098574],
[139.75862503051758, 35.623256366178964],
[139.7643756866455, 35.65645937572578]
])