Description Usage Arguments Details Author(s) References See Also Examples
This is a version of star()
function that only works with the output of 'Ahmes' 1.0. This function calculates the percentage of potential exposure of flat, tilted surfaces to direct solar radiation. It is equivalent to the ratio of the surface projected area to total surface area, but instead of using area data it uses spatial position angles (pitch, roll and course or tilt and course), geographical coordinates, hour and date information. This function implements equation 3 in Escribano-Rocafort et al. (2014).
1 | star.app(x, lat, long, tz)
|
x |
Output of 'Ahmes' 1.0, a .csv file. |
lat |
A vector with the latitude of each observation in decimal format. If all observations correspond to the same latitude, |
long |
A vector with the longitude of each observation in decimal format. If all observations correspond to the same longitude, |
tz |
A vector with the time zone of each observation. If all observations correspond to the same time zone, |
This function calls fixfile
internally before calculating STAR. However, it does not modify the original dataset. To have a permanent fixed version of the data, use new.file<-fixfile(your.data)
. If using new.file
within the package, be aware that the argument Ahmes
should be set to FALSE
.
Agustina Ventre-Lespiaucq and Silvia Santamaria Bueno.
Escribano-Rocafort, A.G., Ventre-Lespiaucq, A.B., Granado-Yela, C., Lopez-Pintor, A., Delgado, J.A., Munoz, V., Dorado, G.A., Balaguer, L. (2014). Simplifying data acquisition in plant canopies- Measurements of leaf angles with a cell phone. Methods in Ecology and Evolution 5:132-140. doi:10.1111/2041-210X.12141.
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