Pre-packaged GeoTIF files (No linguistic component)

View metadata and access the original GEOTIF file: Pre-packaged GeoTIF files (No linguistic component).

Format

GEOTIF

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.

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