Figure 4

Upper row – an example of tracking of open (green box) and closed (yellow box) cellular cloud fields.
Left – Meteostat Second Generation (MSG) satellite, SEVIRI image of clouds over the south subtropical Atlantic ocean, off the coast of Angola and Namibia Sept. 1 2010, at 8am GMT. Right – as in the left figure at 11:45 GMT. Lower row - illustration of the clear optimum in ao and bo estimations for best similarity between two sequential satellite images. Lower left: the normalised-by-mean-differences matrix of the open cell box (marked in green on the upper row) showing a clear optimum in image similarity between the image on the left and the subsequent one. Lower right – as in the example at left, but for the closed-cell (yellow) box.