Autoregressive Neural Network for Cloud Concentration Forecast from Hemispheric Sky Images

Table 2

Statistic indicator comparison between the new ANN forecast model and the persistence forecast model for the 50 manually selected pictures.

Simulation’s time	Model	RMSE (cloud amount)	MAE (cloud amount)
5 minutes (from 145 different pictures)	ANN	51	43	0.96
	Persistence	70	61	0.79