Boule

Use the ellipsoid and coordinate convention attached to the actual observations. An ellipsoid is a reference surface; choosing WGS84 does not transform coordinates from another datum or reference epoch.

Inputs and conventions

For the 0.6 API, coordinates are a tuple (longitude, latitude, height) for geodetic input: angles in degrees, ellipsoidal height in metres. Spherical input uses geocentric latitude and radius in metres, not elevation. Orthometric height above a geoid requires a separate geoid model before use as ellipsoidal height.

Choose an existing ellipsoid such as WGS84 or GRS80 from source metadata, or define a documented body with consistent parameters. Do not infer the ellipsoid from a column merely called height.

Gravity and coordinate conversion