Standardized Precipitation Evapotranspiration Index (SPEI) (ESRI REST)
View metadata and access the original ESRI REST file: Standardized Precipitation Evapotranspiration Index (SPEI).
- Format
- ESRI REST
- Access
- file-only
- Publisher-reported update
- 2025-07-21
The Standardized Precipitation Evapotranspiration Index (SPEI) is computed similarly to the SPI. The main difference is that SPI assesses precipitation variance, while SPEI also considers demand from evapotranspiration which is subtracted from any precipitation accumulation prior to assessment. Unlike the SPI, the SPEI captures the main impact of increased temperatures on water demand.
Data overview
- Formats
- ESRI REST
- Available actions
- Access original file