pysteps.utils.transformation.NQ_transform

pysteps.utils.transformation.NQ_transform(R, metadata=None, inverse=False, **kwargs)

The normal quantile transformation. Zero rain vales are set to zero in norm space.

Parameters:

R : array-like

Array of any shape to be transformed.

metadata : dict

Metadata dictionary containing the transform, zerovalue and threshold attributes as described in the documentation of pysteps.io.importers.

inverse : bool

Optional, if set to True, it performs the inverse transform

Returns:

R : array-like

Array of any shape containing the (back-)transformed units.

metadata : dict

The metadata with updated attributes.

Other Parameters:  

a : float, optional

The offset fraction to be used; typically in (0,1). Default : 0., i.e. it spaces the points evenly in the uniform distribution