Ensemble-Based Data Assimilation with GR Hydrological Models R package airGRdatassim version 0.1.4 CRAN Task View: Hydrology (https://CRAN.R-project.org/view=Hydrology) Add-on to the 'airGR' package which provides the tools to assimilate observed discharges in daily GR hydrological models. The package consists in two functions allowing to perform the assimilation of observed discharges via the Ensemble Kalman filter or the Particle filter as described in Piazzi et al. (2021) <doi:10.1029/2020WR028390>. Software Depends: airGR (>= 1.6.9.27) Imports: graphics, grDevices, stats, utils Suggests: knitr, markdown, rmarkdown Olivier Delaigue <airGR@inrae.fr> Comprehensive R Archive Network (CRAN) Gaia Piazzi [aut] (ORCID: <https://orcid.org/0000-0002-4167-0794>), Olivier Delaigue [aut, cre] (ORCID: <https://orcid.org/0000-0002-7668-8468>), Guillaume Thirel [ctb] (ORCID: <https://orcid.org/0000-0002-1444-1830>), Maxime Logez [ctb] (ORCID: <https://orcid.org/0000-0001-9843-0495>) GPL-2 2025-04-04 application/tgz https://CRAN.R-project.org/package=airGRdatassim doi:10.32614/CRAN.package.airGRdatassim