setHemi: Generate a hemiphoto object
In YplantQMC: Plant architectural analysis with Yplant and QuasiMC.

Description Usage Arguments Author(s) References See Also

Construct an object that contains information on shading by the canopy, as measured with hemi-spherical photographs ('hemiphotos'). Reads one of two formats. See YplantQMC website for example files, and the instruction manual for more background.

setHemi(canfile, canopytrans = 0.02)
evalHemi(hemi, altitude = NULL, azimuth = NULL, 
	met = NULL, degrees = TRUE)
## S3 method for class 'yphemi'
plot(x, met=NULL, sungap=TRUE,
	projection=c("iso","flat"), warn=TRUE, bordercol='black', ...)

`canfile`	A canopy file (see Vignette for format example).
`canopytrans`	Minimum transmission of canopy (when gap fraction = 0).
`hemi`	An object generated with `setHemi`.
`altitude,azimuth`	Viewing altitude and azimuth.
`met`	Optionally, a `ypmet` object.
`degrees`	Whether altitude and azimuth were given in degrees (if FALSE, radians).
`x`	For `plot.yphemi`, a `yphemi` object
`sungap`	If TRUE, and a `ypmet` object is used, plots the sun along the path, with the size relative to the gap fraction
`projection`	If 'iso', each altitude bin has the same width in the plot (Default). If 'flat', projection is as seen from above.
`warn`	If TRUE and sungap=TRUE, warns when gap fractio is very low.
`bordercol`	Color of the grid separating the sky sectors. Use `NA` to omit borders.
`...`	Further arguments passed to plot.default