pysteps.downscaling.rainfarm.downscale¶

pysteps.downscaling.rainfarm.downscale(precip, alpha=None, ds_factor=16, threshold=None, return_alpha=False)¶

Downscale a rainfall field by a given factor.

Parameters

precip: array_like: Array of shape (m,n) containing the input field. The input is expected to contain rain rate values.
alpha: float, optional: Spectral slope. If none, the slope is estimated from the input array.
ds_factor: int, optional: Downscaling factor.
threshold: float, optional: Set all values lower than the threshold to zero.
return_alpha: bool, optional: Whether to return the estimated spectral slope alpha.

Returns

r: array_like: Array of shape (m*ds_factor,n*ds_factor) containing the downscaled field.
alpha: float: Returned only when return_alpha=True.

Notes

Currently, the pysteps implementation of RainFARM only covers spatial downscaling. That is, it can improve the spatial resolution of a rainfall field. However, unlike the original algorithm from Rebora et al. (2006), it cannot downscale the temporal dimension.

References

[RFvHP06]