For the second method, the radiation with wavelengths less than 3 cm was weakened by rain, the relationship between the degree of impairment and rainfall intensity integrated with the horizontal size of the rain along the direction of propagation of radar almost linear. This fact can be used to measure the average rainfall intensity between the start and end point of the distance which the wave travels
through. However, because of the practical difficulties of creating better spatial resolution to measure rainfall intensity for all the rain this technique should not be developed for operational use.
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