求算标准化降水指数SPI值的MATLAB程序，用于求算综合气象干旱指数CI值(Calculate the standardized precipitation index SPI value program)

计算土壤湿度缺失指数SMDI以及蒸散发亏缺指数用于干旱研究(Calculation of soil moisture deficit index SMDI and evapotranspiration deficit index ETDI for drought research)

MATLAB绘制干旱指数面积图，标准化降水指数（Standardized Precipitation Index，简称SPI）采用加利福尼亚大学欧文分校的code计算。(Drawing drought index area map with MATLAB. The standardized precipitation index (SPI) is calculated using the code of the University of California, Irvine.)