The Precipitation Condition drought Index (PCI) is widely used for defining rainfall concentration and rainfall erosion. There are some papers and thesis available which have used this index. But none of them have mentioned any calculation procedure clearly. So if anyone can provide that or any such reference that explains clearly, it will be of immense help for me.
I appreciate any feedback you may have.
PCI ranges from 0 to 100 corresponding to changes in precipitation from extremely unfavourable to optimal. In case of a meteorological drought that has extremely low precipitation, the PCI is close or equal to 0, and at flooding conditions, the PCI is close to 100 Formula : PCI = 100 x (TRMM - TRMM min ) / (TRMM max - TRMM min) (Lingtong Du et al.)
TRMM: tropical rainfall measuring mission (TRMM) TRMM max and TRMM min are multiple year maximum TRMM and minimum TRMM for a pixel.
Regards
The calculations are done as suggested by Bachir Achour
The following paper might also help
Article Analysis of vegetation dynamics, drought in relation with cl...
Check the R Package "precintcon" and its documentations. This may help you.
I appreciate for your answer, dear Bachir Achour,
To examine the trend in the data series related to the PCI drought index, I used the Mann-Kendall test. Studies have shown that the presence of a sequential correlation in the time series will change the variance of S in the Mann-Kendall test and increase the possibility of no trend. To calculate the trend on a regional scale, I intend to use the regional Mann-Kendall mean statistic, so;
Do you recommend this method? If possible, please suggest sources or articles that have explicitly used that.
Best regard
Dear Vahid,
This is an excellent question. I think non-parametric trend tests like Mann-Kendall and Spearman’s rho can be used in your case.
Regards
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