*4.2. Comparison of Di*ff*erent Z-R Relationships*

In this section, the *Z-R* relationships of different experiment areas are compared, as shown in Table 3. The *Z-R* relationships calculated in different studies vary with different measurement methods, different study areas and rainfall time and types. Previous studies have shown that parameter a has a very wide range of values. This is consistent with Kang [55] that the range of parameter a is 10–1200. The parameters a and b vary with different seasons and locations, as well as with the measurement methods. It can be concluded that there is a great variation in the parameters a and b at different places, and *Z-R* relationships should be determined according to different regions. The above analysis also shows that it is of great significance to further improve the accuracy of radar rain measurement inversion and to further study the microphysical characteristics of rainfall [56].


**Table 3.** Results of *Z*-*R* relationships in different study areas.
