The SPI analysis is following the training conducted in 28 Jan 2020 by NASA ARSET on Application of GPM IMERG Reanalysis for Assessing Extreme Dry and Wet Periods. Link: https://appliedsciences.nasa.gov/join-mission/training/english/arset-applications-gpm-imerg-reanalysis-assessing-extreme-dry-and-wet
I will keep the old guideline (jupyter notebook and markdown files) in this repo although some steps might not work, and I have plan to revise it soon. In the meantime, use the new guideline.
Follow the complete guideline here:
Benny Istanto | UN World Food Programme, Indonesia
Thanks to Yanmarshus Bachtiar for CDO's tips and Ridwan Mulyadi for IMERG shell script.