wradlib Documentation - Bitbucket
wradlib Documentation - Bitbucket
wradlib Documentation - Bitbucket
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<strong>wradlib</strong> <strong>Documentation</strong>, Release 0.1.1<br />
Parameters gateset : array<br />
multidimensional array. The range gates (over which iteration has to be performed) are<br />
supposed to vary along the last dimension so, e.g., for a set of l radar images stored<br />
in polar form with m azimuths and n range-bins the input array’s shape can be either<br />
(l,m,n) or (m,l,n) data has to be provided in decibel representation of reflectivity [dBZ]<br />
a : float<br />
b : float<br />
l : float<br />
proportionality factor of the k-Z relation ( k = a ∗ Z b ). Per default set to 1.67e-4.<br />
exponent of the k-Z relation ( k = a ∗ Z b ). Per default set to 0.7.<br />
length of a range gate [km]. Per default set to 1.0.<br />
mode : string<br />
controls how the function reacts, if the sum of signal and attenuation exceeds the threshold<br />
thrs Possible values: ‘warn’ : emit a warning through the module’s logger but<br />
continue execution ‘zero’ : set offending gates to 0.0 ‘nan’ : set offending gates to nan<br />
Any other mode and default setting will raise an Exception.<br />
thrs : float<br />
threshold, for the sum of attenuation and signal, which is deemed unplausible.<br />
Returns pia : array<br />
Array with the same shape as gateset containing the calculated attenuation [dB] for<br />
each range gate.<br />
Raises AttenuationOverflowError :<br />
Exception, if attenuation exceeds thrs and no handling mode is set.<br />
References<br />
[Hitschfeld1954]<br />
3.12.2 <strong>wradlib</strong>.atten.correctAttenuationKraemer<br />
<strong>wradlib</strong>.atten.correctAttenuationKraemer(gateset, a_max=0.000167, a_min=2.33e-<br />
05, b=0.7, n=30, l=1.0, mode=’zero’,<br />
thrs_dBZ=59.0)<br />
Gate-by-Gate attenuation correction according to Stefan Kraemer [Kraemer2008].<br />
Parameters gateset : array<br />
Multidimensional array, where the range gates (over which iteration has to be performed)<br />
are supposed to vary along the last dimension so, e.g., for a set of l radar<br />
images stored in polar form with m azimuths and n range-bins the input array’s shape<br />
can be either (l,m,n) or (m,l,n).<br />
Data has to be provided in decibel representation of reflectivity [dBZ].<br />
a_max : float<br />
3.12. Attenuation Correction 59