Figure 4
From: Short range tracking of rainy clouds by multi-image flow processing of X-band radar data
(A) Picture of the X-band radar on the roof of Politecnico, in Turin. (B) Rainfall rate estimated from the measured reflectivity (the range of rainfall rate was limited to 10 mm per hour; spikes correspond to clutters). (C) Rainfall rate in a region in the East of Turin selected for further processing. (D) Smooth rainfall rate computed from the image in (C) by low pass filtering with a Gaussian mask with standard deviation equal to 1 pixel.