Calculation of the Water Deficit Index (WDI) and the Evaporative Fraction (EF) on Rasters R package wdiEF version 1.0.4 Provides functions to calculate the Water Deficit Index (WDI) and the Evaporative Fraction (EF) using geospatial raster data such as fractional vegetation cover (FVC) and surface-air temperature difference (TS-TA). The package automates regression-based edge fitting and produces continuous spatial maps of surface moisture and evaporative dynamics. Software Imports: dplyr, stats, terra Suggests: testthat (>= 3.0.0) Gaelle Hamelin <gaelle.hamelin@institut-agro.fr> Comprehensive R Archive Network (CRAN) Gaelle Hamelin [aut, cre] (ORCID: <https://orcid.org/0009-0007-2148-7937>) GPL-3 2025-10-20 application/tgz https://CRAN.R-project.org/package=wdiEF doi:10.32614/CRAN.package.wdiEF