Blue: Constructor of blue waveband

In photobiologyWavebands: Waveband Definitions for UV, VIS, and IR Radiation

Constructor of blue waveband

Description

Wavelength-range definitions for blue light according to ISO or as commonly used in plant or remote sensing applications.

Usage

Blue(std = "ISO")

Arguments

std	a character string "ISO", "Sellaro", "Broad", "RS" (remote sensing), or Landsat imagers, "LandsatTM", "LandsatETM", or "LandsatOLI".

Details

The different arguments passed to formal parameter std determine the range of wavelengths set as boundaries of the returned waveband object; "ISO" is 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.

Value

A waveband object defining a wavelength range.

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.

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 \Sexpr[results=rd]{tools:::Rd_expr_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. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1104/pp.110.160820")}.

See Also

new_waveband waveband

Other unweighted wavebands: Far_red(), Green(), IR(), Orange(), Purple(), Red(), UVA(), UVB(), UVC(), UV(), VIS(), Yellow()

Examples

Blue()
Blue("ISO")
Blue("Sellaro")

e_irrad(sun.spct, Blue()) # W m-2
q_irrad(sun.spct, Blue()) # mol m-2
q_irrad(sun.spct, Blue(), scale.factor = 1e6) # umol m-2

photobiologyWavebands documentation built on Oct. 24, 2023, 5:07 p.m.