pysteps.verification.spatialscores.fss

pysteps.verification.spatialscores.fss(X_f, X_o, thr, scale)

Compute the fractions skill score (FSS) for a deterministic forecast field and the corresponding observation.

Parameters:

X_f : array_like

Array of shape (n,m) containing the forecast field.

X_o : array_like

Array of shape (n,m) containing the reference field (observation).

thr : float

Intensity threshold.

scale : int

The spatial scale in px. In practice they represent the size of the moving window that it is used to compute the fraction of pixels above the threshold.

Returns:

out : float

The fractions skill score between 0 and 1.

References

[RL08], [EWW+13]