pysteps.cascade.decomposition.decomposition_fft

pysteps.cascade.decomposition.decomposition_fft(X, filter, **kwargs)

Decompose a 2d input field into multiple spatial scales by using the Fast Fourier Transform (FFT) and a bandpass filter.

Parameters:

X : array_like

Two-dimensional array containing the input field. All values are required to be finite.

filter : dict

A filter returned by a method implemented in pysteps.cascade.bandpass_filters.

Returns:

out : ndarray

A dictionary described in the module documentation. The number of cascade levels is determined from the filter (see pysteps.cascade.bandpass_filters).

Other Parameters:  

fft_method : str or tuple

A string or a (function,kwargs) tuple defining the FFT method to use (see pysteps.utils.interface.get_method()). Defaults to “numpy”.

MASK : array_like

Optional mask to use for computing the statistics for the cascade levels. Pixels with MASK==False are excluded from the computations.