黄土高原1km分辨率逐8天标准化降水蒸散指数(SPEI)数据集(2000-2019年)

本数据集包括中国2000–2019年逐8天尺度的标准化降水蒸散指数（Standardized Precipitation Evapotranspiration Index, SPEI），共计882个图层。数据基于中国气象局国家气象信息中心提供的“中国地面气候资料日值数据V3.0”（http://cdc.cma.gov.cn/）站点观测资料，经插值计算获得。逐8天SPEI在一定程度上平衡了日尺度的波动与长期趋势，能够有效反映中短期干旱过程的发生与演变，为区域水资源管理和生态系统研究提供支撑。

This dataset contains the 8-day-scale Standardized Precipitation Evapotranspiration Index (SPEI) across China from 2000 to 2019, totaling 882 raster layers. The data is derived from the daily station observational data of the "Daily Surface Climate Dataset of China V3.0" (http://cdc.cma.gov.cn/) provided by the National Meteorological Information Center, China Meteorological Administration, via spatial interpolation. The 8-day-scale SPEI balances daily-scale fluctuations and long-term trends to a certain extent, effectively reflecting the occurrence and evolution of medium- and short-term drought processes, and providing support for regional water resources management and ecosystem research.