## To help you get started, we’ve selected a few wradlib examples, based on popular ways it is used in public projects.

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``````xyz : :class:`numpy:numpy.ndarray`
Array of shape (..., 3). Contains cartesian coordinates.
Destination Spatial Reference System (Projection).
Defaults to wgs84 (epsg 4326).
"""
# if site altitude is present, use it, else assume it to be zero
try:
centalt = sitecoords[2]
except IndexError:
centalt = 0.

# if no radius is given, get the approximate radius of the WGS84
# ellipsoid for the site's latitude
if re is None:
# Set up aeqd-projection sitecoord-centered, wgs84 datum and ellipsoid
# use world azimuthal equidistant projection
projstr = ('+proj=aeqd +lon_0={lon:f} +x_0=0 +y_0=0 +lat_0={lat:f} ' +
'+ellps=WGS84 +datum=WGS84 +units=m +no_defs' +
'').format(lon=sitecoords[0], lat=sitecoords[1])

else:
# Set up aeqd-projection sitecoord-centered, assuming spherical earth
# use Sphere azimuthal equidistant projection
projstr = ('+proj=aeqd +lon_0={lon:f} lat_0={lat:f} +a={a:f} '
'+b={b:f} +units=m +no_defs').format(lon=sitecoords[0],
lat=sitecoords[1],
a=re, b=re)

``````
``````Returns
-------
r : :class:`numpy:numpy.ndarray`
Array of xyz.shape. Contains the radial distances.
theta: :class:`numpy:numpy.ndarray`
Array of xyz.shape. Contains the elevation angles.
phi : :class:`numpy:numpy.ndarray`
Array of xyz.shape. Contains the azimuthal angles.
"""

# get the approximate radius of the projection's ellipsoid
# for the latitude_of_center, if no projection is given assume
# spherical earth
try:
lat0 = proj.GetProjParm('latitude_of_center')
except Exception:
re = 6370040.

# calculate xy-distance
s = np.sqrt(np.sum(xyz[..., 0:2] ** 2, axis=-1))

# calculate earth's arc angle
gamma = s / (re * ke)

# calculate elevation angle theta
numer = np.cos(gamma) - (re * ke + alt) / (re * ke + xyz[..., 2])
denom = np.sin(gamma)
theta = np.arctan(numer / denom)

r = (re * ke + xyz[..., 2]) * denom / np.cos(theta)``````