Description Usage Arguments Details Value Note Author(s) References See Also Examples

'su()' calculates daily solar radiation based on daily cloud coverage and temperature range using Supit-Van Kappel model.

1 |

`days` |
Vector of class 'Date' of length n. |

`lat` |
Latitude in decimal degrees. |

`lon` |
Longitude in decimal degrees. |

`extraT` |
Optional. Vector of length n of extraterrestrial solar radiation [MJm-2]. If 'NULL' then it is calculated by the function. Providing extraterrestrial solar radiation speeds up the computation |

`A` |
Supit-Van Kappel model coefficient 'A'. If 'NA' then A is derived from the map of interpolated coefficients estimated from Meteosat solar radiation data. See details. |

`B` |
Supit-Van Kappel model coefficient 'B'. If 'NA' then B is derived from the map of interpolated coefficients estimated from Meteosat solar radiation data. See details. |

`C` |
Supit-Van Kappel model coefficient 'C'. If 'NA' then C is derived from the map of interpolated coefficients estimated from Meteosat solar radiation data. See details. |

`tmax` |
Vector of length n containing daily maximum temperature [C]. |

`tmin` |
Vector of length n containing daily minumum temperature [C]. |

`CC` |
Vector of length n containing daily cloud coverage [octas]. |

Supit and Van Kappel proposed a method for estimating solar radiation from daily cloud coverage and temperature range. Model coefficients A, B and C (if not provided) are derived from interpolated Meteosat-based coefficients from Bojanowski et al. 2013.

Vector of length n of daily solar radiation [MJm-2].

'CC', 'Tmax', 'Tmin' can contain NA's, but length of vectors 'CC', 'Tmax', 'Tmin' and 'days' has to be the identical.

Jedrzej S. Bojanowski

Bojanowski, J.S., Vrieling, A., Skidmore, A.K., 2013. Calibration of solar radiation models for Europe using Meteosat Second Generation and weather station data. Agricultural and Forest Meteorology 176:1-9.

Supit, I. 1994. Global radiation. Publication EUR 15745 EN of the Office for Official Publications of the EU, Luxembourg.

Supit, I., Kappel, R.R. van, 1998. A simple method to estimate global radiation. Solar Energy, 63:147-160.

'sucal' to calibrate the model.

1 2 3 4 5 6 7 8 9 10 | ```
require(zoo)
data(Metdata)
tmax <- Metdata$meteo$TEMP_MAX
tmin <- Metdata$meteo$TEMP_MIN
cc <- Metdata$meteo$CLOUD_DAYTIME_TOTAL
days <- Metdata$meteo$DAY
lat <- Metdata$LATITUDE
lon <- Metdata$LONGITUDE
plot(zoo(su(days=days, lat=lat, lon=lon, extraT=NULL, A=NA, B=NA,
C=-NA, tmax=tmax, tmin=tmin, CC=cc),order.by=days))
``` |

sirad documentation built on May 31, 2017, 1:44 a.m.

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.