月度SPI和PDSI来自NCDC网站:

http://gis.ncdc.noaa.gov/

更长时间序列的PDSI(1901-2018)下载链接:

http://climexp.knmi.nl/selectfield_obs2.cgi?id=someone@somewhere

http://climexp.knmi.nl/select.cgi?id=someone@somewhere&field=scpdsi

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