wradlib.georef.misc.bin_distance¶
-
wradlib.georef.misc.
bin_distance
(r, theta, sitealt, re, ke=1.3333333333333333)¶ Calculates great circle distance from radar site to radar bin over spherical earth, taking the refractivity of the atmosphere into account.
\[s = k_e r_e \arctan\left( \frac{r \cos\theta}{r \cos\theta + k_e r_e + h}\right)\]where \(h\) would be the radar site altitude amsl.
Parameters: - r (
numpy.ndarray
) – Array of ranges [m] - theta (scalar or
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) – site altitude [m] amsl.
- 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: distance (
numpy.ndarray
) – Array of great circle arc distances [m]- r (