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wradlib Documentation, Release 0.1.1 cappi UNDER DEVELOPMENT: Create a CAPPI from sweep data with multiple elevation angles 3.11.1 wradlib.vpr.cappi wradlib.vpr.cappi(data, sitecoords, elevs, levels, dx, dy, maxvert, maxhoriz, projstr) UNDER DEVELOPMENT: Create a CAPPI from sweep data with multiple elevation angles Parameters data : float ndarray with shape (num elevations, num azimuth angles, num range bins) sitecoords : sequence of three floats indicating the radar position (latitude in decimal degrees, longitude in decimal degrees, height a.s.l. in meters) elevs : sequence of elevation angles corresponding to first dimension of data levels : sequence of floats target altitudes for CAPPI (in meters) dx : float horizontal resolution of CAPPI in x direction dy : float horizontal resolution of CAPPI in y direction maxvert : float maximum vertical distance threshold - the next data bin must be closer to the target location than maxvert in order to assign a value maxhoriz : float maximum horizontal distance threshold - the next data bin must be closer to the target location than maxhoriz in order to assign a value projstr : proj.4 projection string Returns output : float ndarray of shape (number of levels, number of x coordinates, number of y coordinates) 3.12 Attenuation Correction correctAttenuationHB correctAttenuationKraemer correctAttenuationHJ correctAttenuationConstrained constraint_dBZ constraint_PIA Gate-by-Gate attenuation correction according to Hitschfeld & Bordan Gate-by-Gate attenuation correction according to Stefan Kraemer Gate-by-Gate attenuation correction based on Stefan Kraemer Gate-by-Gate attenuation correction based on the iterative approach of Constraint callback function for correctAttenuationConstrained. Constraint callback function for correctAttenuationConstrained. 3.12.1 wradlib.atten.correctAttenuationHB wradlib.atten.correctAttenuationHB(gateset, coefficients={‘a’: 0.000167, ‘b’: 0.7, ‘l’: 1.0}, mode=’‘, thrs=59.0) Gate-by-Gate attenuation correction according to Hitschfeld & Bordan [Hitschfeld1954] 58 Chapter 3. Library Reference
wradlib Documentation, Release 0.1.1 Parameters gateset : array multidimensional array. The range gates (over which iteration has to be performed) are supposed to vary along the last dimension so, e.g., for a set of l radar images stored in polar form with m azimuths and n range-bins the input array’s shape can be either (l,m,n) or (m,l,n) data has to be provided in decibel representation of reflectivity [dBZ] a : float b : float l : float proportionality factor of the k-Z relation ( k = a ∗ Z b ). Per default set to 1.67e-4. exponent of the k-Z relation ( k = a ∗ Z b ). Per default set to 0.7. length of a range gate [km]. Per default set to 1.0. mode : string controls how the function reacts, if the sum of signal and attenuation exceeds the threshold thrs Possible values: ‘warn’ : emit a warning through the module’s logger but continue execution ‘zero’ : set offending gates to 0.0 ‘nan’ : set offending gates to nan Any other mode and default setting will raise an Exception. thrs : float threshold, for the sum of attenuation and signal, which is deemed unplausible. Returns pia : array Array with the same shape as gateset containing the calculated attenuation [dB] for each range gate. Raises AttenuationOverflowError : Exception, if attenuation exceeds thrs and no handling mode is set. References [Hitschfeld1954] 3.12.2 wradlib.atten.correctAttenuationKraemer wradlib.atten.correctAttenuationKraemer(gateset, a_max=0.000167, a_min=2.33e- 05, b=0.7, n=30, l=1.0, mode=’zero’, thrs_dBZ=59.0) Gate-by-Gate attenuation correction according to Stefan Kraemer [Kraemer2008]. Parameters gateset : array Multidimensional array, where the range gates (over which iteration has to be performed) are supposed to vary along the last dimension so, e.g., for a set of l radar images stored in polar form with m azimuths and n range-bins the input array’s shape can be either (l,m,n) or (m,l,n). Data has to be provided in decibel representation of reflectivity [dBZ]. a_max : float 3.12. Attenuation Correction 59
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