Description Usage Arguments Author(s) References Examples

Estimates the cloudiness of the atmosphere by scaling to atmospheric transmissivity

1 2 | ```
EstCloudiness(Tx=(-999), Tn=(-999), trans=NULL, transMin = 0.15,
transMax = 0.75, opt = "linear")
``` |

`Tx` |
maximum daily temperature [C] |

`Tn` |
minimum daily temperature [C] |

`trans` |
transmissivity of the atmosphere (value between 0-1) |

`transMin` |
Transmissivities equal and below this value will return a cloudiness value of 1 (for linear approximation) |

`transMax` |
Transmissivities equal and above this value will return a cloudiness value of 0 (for linear approximation) |

`opt` |
Currently there are two options: "linear" (Campbell 1985) and "Black" (1956) |

M. Todd Walter, Josephine Archibald

Campbell G.S. (1985) Soil Physics with Basic: Transport Models for Soil Plant Systems. Elsevier, New York

Black, J.N. (1956) The Distribution of Solar Radiation over the Earth's Surface. Theoretical and Applied Climatology 7:2 165-189

1 2 | ```
EstCloudiness(trans=0.2)
EstCloudiness(20,12,opt="Black")
``` |

```
Loading required package: operators
Attaching package: 'operators'
The following objects are masked from 'package:base':
options, strrep
Loading required package: topmodel
Loading required package: DEoptim
Loading required package: parallel
DEoptim package
Differential Evolution algorithm in R
Authors: D. Ardia, K. Mullen, B. Peterson and J. Ulrich
Loading required package: XML
[1] 0.9166667
[1] 0.4054344
```

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