pysteps.extrapolation.interface.eulerian_persistence¶

pysteps.extrapolation.interface.eulerian_persistence(precip, velocity, num_timesteps, outval=nan, **kwargs)¶

A dummy extrapolation method to apply Eulerian persistence to a two-dimensional precipitation field. The method returns the a sequence of the same initial field with no extrapolation applied (i.e. Eulerian persistence).

Other Parameters:
Parameters:	precip : array-like Array of shape (m,n) containing the input precipitation field. All values are required to be finite. velocity : array-like Not used by the method. num_timesteps : int Number of time steps. outval : float, optional Not used by the method.
Returns:	out : array or tuple If return_displacement=False, return a sequence of the same initial field of shape (num_timesteps,m,n). Otherwise, return a tuple containing the replicated fields and a (2,m,n) array of zeros.
	return_displacement : bool If True, return the total advection velocity (displacement) between the initial input field and the advected one integrated along the trajectory. Default : False

References

[GZ02] Germann et al (2002)