http://link.springer.com/article/10.1007/s12517-016-2378-x

http://link.springer.com/article/10.1007/s12517-015-2185-9

http://link.springer.com/article/10.1007/s10661-016-5187-5

http://www.srs.fs.usda.gov/pubs/gtr/gtr_wo93b_009.pdf?

http://www.ajol.info/index.php/ejesm/article/view/129666

http://www.allresearchjournal.com/archives/2016/vol2issue1/PartG/1-13-140.pdf

http://chinaagrisci.com/Jwk_zgnykxen/EN/article/downloadArticleFile.do?attachType=PDF&id=10424

http://www.mdpi.com/2071-1050/8/4/346/htm

Hello,Eric Ariel L.Salas..thank for help me. 

Hello Abhishek Raj,

thank you

Hi Dear Mahin

Do you want to use GIS for calculating SPI due to input format of files?

I mean that Are your input files in nc4 or nc format?

Regards,

Nasrin

www.agrimetsoft.com