wradlib.georef.misc.bin_altitude(r, theta, sitealt, re, ke=1.3333333333333333)

Calculates the height of a radar bin taking the refractivity of the atmosphere into account.

Based on the bin altitude is calculated as

$h = \sqrt{r^2 + (k_e r_e)^2 + 2 r k_e r_e \sin\theta} - k_e r_e$
Parameters
• r (numpy:numpy.ndarray) – Array of ranges [m]

• theta (scalar or numpy:numpy.ndarray broadcastable to the shape) – of r elevation angles in degrees with 0° at horizontal and +90° pointing vertically upwards from the radar

• sitealt (float) – Altitude in [m] a.s.l. of the referencing radar site

• re (float) – earth’s radius [m]

• ke (float) – adjustment factor to account for the refractivity gradient that affects radar beam propagation. In principle this is wavelength- dependent. The default of 4/3 is a good approximation for most weather radar wavelengths

Returns

altitude (numpy:numpy.ndarray) – Array of heights of the radar bins in [m]