How to calculate standardized precipitation index (SPI).

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Govind Kumar
Govind Kumar 2019-6-19
回答： Chad Greene 2019-7-17
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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dpb
dpb 2019-6-19
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?
dpb
dpb 2019-6-19
编辑：dpb 2019-6-20
Turns out this is quite a lot of work...see https://journals.ametsoc.org/doi/full/10.1175/JAMC-D-14-0032.1 and the definitive (apparently) work https://climate.colostate.edu/pdfs/relationshipofdroughtfrequency.pdf
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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回答（1 个）

Chad Greene
Chad Greene 2019-7-17
Hi Govind,
You might want to check out the spei function in the Climate Data Toolbox for Matlab.
Chad

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