How to calculate SPI drought index for last 30 years using rainfall grid data?
Follow these articles
Article Comparison of the Performance of Six Drought Indices in Char...
http://www.wamis.org/agm/meetings/wies09/S62-Khanna.pdf
For calculation I recomend R using the SPEI - Package
https://cran.r-project.org/web/packages/SPEI/SPEI.pdf
You can performe:
SPEI Standardized Precipitation-Evapotranspiration Index
SPI Standardized Precipitation Index
Tutorial can be found her: Research HOW TO USE: Package 'SPEI' For BASIC CALCULATIONS
Dear Das
You can easily calculate it with DMAP and MDM tools. If you want calculate SPI for middle-East by AgMERRA precipitation data with 0.25degree*0.25degree resolution, by using MDM tool you can compute SPI very soon an get Excel files for your outputs.
See the bellow links which are so useful and you can also customize your demand through the link.
If you have other questions let me know:
https://agrimetsoft.com/drought%20monitoring%20and%20prediction.aspx
https://agrimetsoft.com/MDM.aspx
Also, in DMAP you can as well calculate more than 18 drought indices. It is really easy and user-friendly.
Cheers,
Nasrin
There is several gauges that you can use it such as AgMerra, CPC, TRMM, Gleam, .... but the format of data in all gauges is netcdf and you can use Netcdf-Extractor and "Open NC File" for extract data from netcdf files. Also you can use Matlab, NCl, NCO, etc.
In other hands, there is a paper in researchgate that use AgMerra for calculating 8 drought indices.
https://www.researchgate.net/publication/320467560_Estimation_of_meteorological_drought_indices_based_on_AgMERRA_precipitation_data_and_station-observed_precipitation_data?_sg=_dTIOsm72WFWBCy2BJ6jmp3fXP8smwODTFeXonouxTyK5mbI14gSscVVR7kaDWPXf3QXSL_Bf4VO15CDCxcmccSG0AKCWW8ZR7h8QUhG.SGW6SUZ0X_Omgd-tetFG3aTxRjefb_7Pn4HytiZI0mcNgJiaKvgvM8Szw4nqigE-19RPNwv6XJW56t4tT5s5gA
and you can read this paper for knowing about 4 gauges.
Article Evaluation of different gridded rainfall datasets for rainfe...
This maybe useful for your needs: https://agrimetsoft.com/mdm.aspx
You can use R with SPEI package
or Drought Indices Calculator (DrinC) software ( http://drought-software.com/ )
Please follow this video. It is very useful.
https://www.youtube.com/watch?v=dLpmUVDRFbM
For SPI calculation in MATLAB, we can get its code through file Exchange method.
We have worked on this issue in these manuscripts that can serve you: Article Systematization of the calculation of the Standardized Preci...
Dear Dr Sandipan Das . See the following useful link: https://library.wmo.int/doc_num.php?explnum_id=7768
Kindly check also the following good link: https://gmao.gsfc.nasa.gov/research/subseasonal/atlas/SPI-html/SPI-description.html
Check https://library.wmo.int/doc_num.php?explnum_id=7768
https://www.droughtmanagement.info/standardized-precipitation-index-spi/
Also check https://www.mdpi.com/2073-4433/12/5/603/pdf
https://journals.ametsoc.org/view/journals/apme/53/10/jamc-d-14-0032.1.xml
Check on this website
http://www.wamis.org/agm/pubs/SPI/WMO_1090_EN.pdf
It is calculated at weekly interval. But dry spell between first moisture to current determine the drought.
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