Short term cloud coverage prediction using ground-based all sky imaging

摘要

A method for predicting short-term cloud coverage includes a computer calculating an estimated cloud velocity field at a current time value based on sky images. The computer determines a segmented cloud model based on the sky images, a future sun location corresponding to a future time value, and sun pixel locations at the future time value based on the future sun location. Next, the computer applies a back-propagation algorithm to the sun pixel locations using the estimated cloud velocity field to yield propagated sun pixel locations corresponding to a previous time value. Then, the computer predicts cloud coverage for the future sun location based on the propagated sun pixel locations and the segmented cloud model.

主权项

1. A method for predicting short-term cloud coverage, the method comprising:
calculating, by a computer, an estimated cloud velocity field at a current time value based on a plurality of sky images; determining, by the computer, a segmented cloud model based on the plurality of sky images; determining, by the computer, a future sun location corresponding to a future time value; determining, by the computer, a plurality of sun pixel locations at the future time value based on the future sun location; applying, by the computer, a back-propagation algorithm to the plurality of sun pixel locations using the estimated cloud velocity field to yield a plurality of propagated sun pixel locations corresponding to a previous time value; and predicting, by the computer, cloud coverage for the future sun location based on the plurality of propagated sun pixel locations and the segmented cloud model.