How can I calculate the standardised precipitation index (3 months and 6 months) with excel?

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Mohamed Elmehdi Saidi

hello.

look at :

http://www.ncl.ucar.edu/Document/Functions/Built-in/dim_spi_n.shtml

Hadda Ladji

Thanks very much Pr Saidi.

Andreas Schlueter

Hi Mohamed,

If you have access to MATLAB, there are several packages available:

try:

https://de.mathworks.com/matlabcentral/fileexchange/26018-standardized-precipitation-index

https://de.mathworks.com/matlabcentral/fileexchange/51080-nonparametric-standardized-precipitation-index--spi-

https://de.mathworks.com/matlabcentral/fileexchange/26018-standardized-precipitation-index?focused=5141825&tab=function

Good luck!

Andreas

Thank you very mach Mr Andreas Schlueter for your help.

Mohammad Mahdi Jafari Zavareh

Hi hadda

You can calculate it easily by satellite image without download it with GEE.

It will calculated by 2 datasets, MODIS & CHIRPS from 1month to 48 months SPI

https://un-spider.org/advisory-support/recommended-practices/recommended-practice-drought-monitoring-spi/step-by-step

BEST REGARD