气象干旱指标计算程序，已经集成为arcgis工具箱，导入后即可使用 也可在py环境下直接运行(The meteorological drought indicator calculation program has been integrated into the arcgis toolbox and can be used after import. Can also run directly in py environment)

CSIC官网的spei小程序，用于计算标准化降水蒸散指数SPEI，内涵小程序使用说明和测试数据(The spei applet of CSIC website is used to calculate the standardized precipitation evapotranspiration index (spei), the instruction and test data of the content applet)

实现日SPEI标准化降水蒸散指数的数据,此程序中蒸发使用彭曼公式计算(the program can be used to calculate the daily SPEI value)