Wavelength-range definitions for green light according to ISO or as commonly used in plant or remote sensing applications.
Details
The different arguments passed to formal parameter std
determine the range of wavelengths set as boundaries of the returned
waveband
object; "ISO"
is an standardized
definition based on human colour vision; "Sellaro"
and
"Broad"
are non-standard but used in plant sciences; "RS"
is
non-standard but frequently used in remote sensing; the remaining
definitions are for the published wavelength sensitivity range of imagers
(cameras) in the Landsat satellite missions.
Note
The bands are defined as square windows, these can be applied to spectral data to obtain the "true" values, but they do not simulate the sensitivity of broad-band sensors or the spectral transmittance of ionic filters. Some band-pass interference filters may have very sharp cut-in and cut-off, and their effect can be approximated by a square window, but filters based on light absorption will show gradual tails and bell-shaped wavelength-windows. The Landsat instruments have very steep cut-in and cut-off slopes and are well approximated.
When released, this package will replace the package UVcalc.
References
Aphalo, P. J., Albert, A., Björn, L. O., McLeod, A. R., Robson, T. M., Rosenqvist, E. (Eds.). (2012). Beyond the Visible: A handbook of best practice in plant UV photobiology (1st ed., p. xxx + 174). Helsinki: University of Helsinki, Department of Biosciences, Division of Plant Biology. ISBN 978-952-10-8363-1 (PDF), 978-952-10-8362-4 (paperback). Open access PDF download available at doi:10.31885/9789521083631 .
ISO (2007) Space environment (natural and artificial) - Process for determining solar irradiances. ISO Standard 21348. ISO, Geneva.
Sellaro, R., Crepy, M., Trupkin, S. A., Karayekov, E., Buchovsky, A. S., Rossi, C., & Casal, J. J. (2010). Cryptochrome as a sensor of the blue/green ratio of natural radiation in Arabidopsis. Plant physiology, 154(1), 401-409. doi:10.1104/pp.110.160820 .
Examples
Green()
#> Green.ISO
#> low (nm) 500
#> high (nm) 570
#> weighted none
Green("ISO") # 500 to 570
#> Green.ISO
#> low (nm) 500
#> high (nm) 570
#> weighted none
Green("Sellaro") # 500 to 570 nm
#> Green.Sellaro
#> low (nm) 500
#> high (nm) 570
#> weighted none
e_irrad(sun.spct, Green()) # W m-2
#> E_Green.ISO
#> 49.2686
#> attr(,"time.unit")
#> [1] "second"
#> attr(,"radiation.unit")
#> [1] "total energy irradiance"
q_irrad(sun.spct, Green()) # mol m-2
#> Q_Green.ISO
#> 0.0002201989
#> attr(,"time.unit")
#> [1] "second"
#> attr(,"radiation.unit")
#> [1] "total photon irradiance"
q_irrad(sun.spct, Green(), scale.factor = 1e6) # umol m-2
#> Q_Green.ISO
#> 220.1989
#> attr(,"time.unit")
#> [1] "second"
#> attr(,"radiation.unit")
#> [1] "total photon irradiance"