chaosmagpy.coordinate_utils.basevectors_use¶
- chaosmagpy.coordinate_utils.basevectors_use(theta, phi)[source]¶
Computes the unit base vectors of local orthogonal coordinate system USE (Up-South-East) on the spherical surface (theta, phi) with respect to the standard geographic coordinate system (GEO).
- Parameters:
- thetandarray, shape (…)
Geocentric colatitude in degrees \((0^\circ, 180^\circ)\), i.e. exclude poles.
- phindarray, shape (…)
Geocentric longitude in degrees.
- Returns:
- use_1, use_2, use_3ndarray, shape (…, 3)
USE unit base vectors. The leading dimension agrees with the shape of
theta
orphi
, while the last dimension contains the unit vector components in terms of GEO.