wradlib.qual.beam_block_frac

wradlib.qual.beam_block_frac(th, bh, a)

Partial beam blockage fraction.

Note

Code was migrated from nguy/PyRadarMet.

From Bech et al. (2003), Eqn 2 and Appendix

Parameters:

• th (float or numpy.ndarray) – Terrain height [m]

• bh (float or numpy.ndarray) – Beam height [m]

• a (float or numpy.ndarray) – Half power beam radius [m]

Returns:

pbb (float or numpy.ndarray) – Partial beam blockage fraction [unitless]

Examples

>>> pbb = beam_block_frac(th,bh,a) 

See Beam Blockage Calculation using a DEM.

Note

This procedure uses a simplified interception function where no vertical gradient of refractivity is considered. Other algorithms treat this more thoroughly. However, this is accurate in most cases other than the super-refractive case.

See the the half_power_radius function to calculate variable a.

The heights must be the same units!