MATLAB Answers


How to calculate standardized precipitation index (SPI).

Asked by Govind Kumar on 19 Jun 2019
Latest activity Answered by Chad Greene
on 17 Jul 2019
I have rainfall data in .mat format. Data is 2D matrix mxn where m are row representing m days and n is column representing n locations. I wanted to calculated SPI for each location as well as whole country. Please do not suggest any softweaer.


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yes matlab is softwear but i mentioned this because sometimes people provide link to download softwear instead of solution in matlab. SPI mean standardized precipitation index. It is a drought index which is used for drought trend analysis.
Well, what's the actual definition one could use to calculate from? We're not all specialists in various fields...
What have you tried so far?
They're fitting multiple distributions to find best fit of precipitation data over the given time period, then using that to compute a percentile.
Search the FileExchange; there are several submissions there that should at least give you a head start...this won't be a five-minute exercise.

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1 Answer

Answer by Chad Greene
on 17 Jul 2019

Hi Govind,
You might want to check out the spei function in the Climate Data Toolbox for Matlab.


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