How to calculate standardized precipitation index (SPI).
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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
on 19 Jun 2019
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
on 19 Jun 2019
Edited: dpb
on 20 Jun 2019
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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