Sidereon.Geodesic (Sidereon v0.23.0)

WGS84 geodesic direct and inverse solves.

Angles are degrees and distances are metres at this boundary. The underlying solver is Karney's WGS84 geodesic implementation from sidereon-core.

Summary

direct_result()

Direct geodesic result.

inverse_result()

Inverse geodesic result.

Solve the WGS84 direct geodesic problem.

Solve the WGS84 inverse geodesic problem.

@type direct_result() :: %{lat2_deg: float(), lon2_deg: float(), azi2_deg: float()}

Direct geodesic result.

@type inverse_result() :: %{s12_m: float(), azi1_deg: float(), azi2_deg: float()}

Inverse geodesic result.

@spec direct(number(), number(), number(), number()) ::
  {:ok, direct_result()} | {:error, Sidereon.Geodesic.GeodesicError.t()}

Solve the WGS84 direct geodesic problem.

Inputs are point 1 latitude, longitude, forward azimuth, and geodesic distance. Returns point 2 latitude, longitude, and forward azimuth.

@spec inverse(number(), number(), number(), number()) ::
  {:ok, inverse_result()} | {:error, Sidereon.Geodesic.GeodesicError.t()}

Solve the WGS84 inverse geodesic problem.

Inputs are point 1 latitude and longitude followed by point 2 latitude and longitude, all in degrees. Returns geodesic distance and forward azimuths.