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 field.

Parameters

  • X_f (array_like) – Array of shape (m, n) containing the forecast field.

  • X_o (array_like) – Array of shape (m, n) containing the observation field.

  • thr (float) – The intensity threshold.

  • scale (int) – The spatial scale in pixels. In practice, the scale represents the size of the moving window that it is used to compute the fraction of pixels above the threshold.

Returns

out – The fractions skill score between 0 and 1.

Return type

float

References

[RL08], [EWW+13]