Description

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.

Resources

Name	Format	Description	Link
Agroclimate Interactive Maps (French)	HTML		https://agriculture.canada.ca/atlas/agclimat
Agroclimate Interactive Maps (English)	HTML		https://agriculture.canada.ca/atlas/agclimate
Pre-packaged GeoTIF files (No linguistic component)	Unknown		https://agriculture.canada.ca/atlas/data_donnees/agClimate/data_donnees/tif/spei/
Data Product Specification (English)	PDF		https://agriculture.canada.ca/atlas/data_donnees/agClimate/supportdocument_documentdesupport/en/ISO_19131_AgClimate_-_Data_Product_Specification.pdf
Using AAFC Climate Services (English)	PDF		https://agriculture.canada.ca/atlas/data_donnees/agClimate/supportdocument_documentdesupport/en/Using%20AAFC%20Climate%20Services.pdf
Data Product Specification (French)	PDF		https://agriculture.canada.ca/atlas/data_donnees/agClimate/supportdocument_documentdesupport/fr/Donnees_agroclimat_-_SPC.pdf
Using AAFC Climate Services (French)	PDF		https://agriculture.canada.ca/atlas/data_donnees/agClimate/supportdocument_documentdesupport/fr/Utilisation%20des%20services%20climatologiques%20d'AAC.pdf
Standardized Precipitation Evapotranspiration Index (SPEI)	Ersi REST		https://agriculture.canada.ca/imagery-images/rest/services/agclimate/standardized_precipitation_evapotranspiration_index/ImageServer
Standardized Precipitation Evapotranspiration Index (SPEI)	Ersi REST		https://agriculture.canada.ca/imagery-images/rest/services/agclimat/indice_normalise_precipitations_moins_evapotranspiration/ImageServer

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