heyoka.model.geo2cart

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heyoka.model.geo2cart#

heyoka.model.geo2cart(geo: Iterable[expression], ecc2: float = 0.006694379990197619, R_eq: float = 6378137.0) → list[expression]#

Transform geodetic coordinates into Cartesian coordinates.

Added in version 7.3.0.

This function will convert the input geodetic coordinates geo (height, latitude, longitude) into Cartesian coordinates. The input height is expected in the same units as R_eq, while latitude and longitude are expected in radians.

A few checks are run on the input arguments. Specifically:

  • the number of geodetic variables (i.e., the length of geo) must be three,

  • ecc2 must be finite and non-negative,

  • R_eq must be finite and positive.

The default values for R_eq and ecc2 are taken from the WGS84 model.

Parameters:

  • geo – expressions for the geodetic components.

  • ecc2 – the reference ellipsoid eccentricity squared.

  • R_eq – the reference ellipsoid equatorial radius.

Returns:

the expressions for the Cartesian coordinates [x, y, z] in the same units as R_eq.

Raises:

ValueError – if one or more input arguments are malformed, as explained above.

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