For the second method, radiation with wavelengths smaller than 3 cm strong weakened by rain, the relationship between the degree of weakness and area of precipitation intensity with the horizontal size of the precipitation region along the direction of wave radar transmitters are almost linear. This fact can be used to measure the intensity of rain on average between the beginning and end of the distance which the wave mediathrough. Song, because of the practical difficulty of creating a good spatial resolution to measure precipitation intensity for all the rain this technique should not be used for professional development.
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