RF_Weights {CSTools} | R Documentation |

## Compute climatological weights for RainFARM stochastic precipitation downscaling

### Description

Compute climatological ("orographic") weights from a fine-scale precipitation climatology file.

### Usage

```
RF_Weights(
zclim,
latin,
lonin,
nf,
lat,
lon,
fsmooth = TRUE,
lonname = "lon",
latname = "lat",
ncores = NULL
)
```

### Arguments

`zclim` |
A multi-dimensional array with named dimension containing at least one precipiation field with spatial dimensions. |

`latin` |
A vector indicating the latitudinal coordinates corresponding to
the |

`lonin` |
A vector indicating the longitudinal coordinates corresponding to
the |

`nf` |
Refinement factor for downscaling (the output resolution is increased by this factor). |

`lat` |
Vector of latitudes. The number of longitudes and latitudes is expected to be even and the same. If not the function will perform a subsetting to ensure this condition. |

`lon` |
Vector of longitudes. |

`fsmooth` |
Logical to use smooth conservation (default) or large-scale box-average conservation. |

`lonname` |
A character string indicating the name of the longitudinal dimension set as 'lon' by default. |

`latname` |
A character string indicating the name of the latitudinal dimension set as 'lat' by default. |

`ncores` |
An integer that indicates the number of cores for parallel computations using multiApply function. The default value is one. |

### Value

An object of class 's2dv_cube' containing in matrix `data`

the
weights with dimensions (lon, lat).

### Author(s)

Jost von Hardenberg - ISAC-CNR, j.vonhardenberg@isac.cnr.it

### References

Terzago, S., Palazzi, E., & von Hardenberg, J. (2018). Stochastic downscaling of precipitation in complex orography: A simple method to reproduce a realistic fine-scale climatology. Natural Hazards and Earth System Sciences, 18(11), 2825-2840. doi: 10.5194/nhess-18-2825-2018.

### Examples

```
a <- array(1:2500, c(lat = 50, lon = 50))
res <- RF_Weights(a, seq(0.1 ,5, 0.1), seq(0.1 ,5, 0.1),
nf = 5, lat = 1:5, lon = 1:5)
```

*CSTools*version 5.2.0 Index]