# airGR: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
# airGR: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
## Overview
## Overview
This package brings into R the hydrological modelling tools used at IRSTEA-Antony ([Catchment Hydrology research group](airGR website) of the HYCAR Research Unit, France), including rainfall-runoff models (**GR4H**, **GR4J**, **GR5J**, **GR6J**, **GR2M**, **GR1A**) and a snow accumulation and melt model (**CemaNeige**). Each model core is coded in FORTRAN to ensure low computational time. The other package functions (i.e. mainly the calibration algorithm and the computation of the efficiency criteria) are coded in R.
This package brings into R the hydrological modelling tools used at IRSTEA-Antony ([Catchment Hydrology research group](https://webgr.irstea.fr/en/home/) of the HYCAR Research Unit, France), including rainfall-runoff models (**GR4H**, **GR4J**, **GR5J**, **GR6J**, **GR2M**, **GR1A**) and a snow accumulation and melt model (**CemaNeige**). Each model core is coded in FORTRAN to ensure low computational time. The other package functions (i.e. mainly the calibration algorithm and the computation of the efficiency criteria) are coded in R.
## Installation
## Installation
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4. refer to the help for `ErrorCrit_NSE` and `CreateInputsCrit` to understand how the computation of an error criterion is prepared/made;
4. refer to the help for `ErrorCrit_NSE` and `CreateInputsCrit` to understand how the computation of an error criterion is prepared/made;
5. refer to the help for `Calibration_Michel`, run the provided example and then refer to the help for `CreateCalibOptions` to understand how a model calibration is prepared/made.
5. refer to the help for `Calibration_Michel`, run the provided example and then refer to the help for `CreateCalibOptions` to understand how a model calibration is prepared/made.
For more information and to get started with the package, you can refer to the vignette (`vignette("airGR")`) and go on the airGR [website](https://hydrogr.github.io/airGR/index.html).
For more information and to get started with the package, you can refer to the vignette (`vignette("airGR")`) and go on the [airGR website](https://hydrogr.github.io/airGR/index.html).