import numpy as np
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[docs]
def azimuth_to_en(azimuth):
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"""Convert azimuth (clockwise from north) to east and north unit vector.
Parameters
----------
azimuth : float
Azimuth in decimal degrees.
Returns
-------
east : float
East component of unit vector.
north : float
North component of unit vector.
Notes
-----
Calculation uses a spherical approximation.
"""
r_az = np.radians(azimuth)
return (np.sin(r_az), np.cos(r_az))