wradlib.trafo.kdp_to_r(kdp, f, a=129.0, b=0.85)[source]#

Estimating rainfall intensity directly from specific differential phase.

The general power law expression has been suggested by [Ryzhkov et al., 2005].

The default parameters have been set according to [Bringi et al., 2001].


Please note that this way, rainfall intensities can become negative. This is an intended behaviour in order to account for noisy \(K_{DP}\) values.

  • kdp (float or numpy.ndarray) – \(K_{DP}\) as array of floats

  • f (float) – radar frequency [GHz]

    • Standard frequencies in X-band range between 8.0 and 12.0 GHz,

    • Standard frequencies in C-band range between 4.0 and 8.0 GHz,

    • Standard frequencies in S-band range between 2.0 and 4.0 GHz.

  • a (float) – linear coefficient of the power law

  • b (float) – exponent of the power law


output (numpy.ndarray) – array of rainfall intensity