relative_AM

Approximate relative air mass (AM) from sun elevation or
sun zenith angle.

Definitions of classes, methods, operators and functions for use
in photobiology and radiation meteorology and climatology. Calculation of
effective (weighted) and not-weighted irradiances/doses, fluence rates,
transmittance, reflectance, absorptance, absorbance and diverse ratios and
other derived quantities from spectral data. Local maxima and minima: peaks,
valleys and spikes. Conversion between energy-and photon-based units.
Wavelength interpolation. Astronomical calculations related solar angles and
day length. Colours and vision. This package is part of the 'r4photobiology'
suite, Aphalo, P. J. (2015) <doi:10.19232/uv4pb.2015.1.14>.

Pedro Aphalo

photobiology

Photobiological Calculations

Pedro J. Aphalo

Titta K. Kotilainen

Glenn Davis

Agnese Fazio

relative_AM function

<dl><dt>elevation.angle, zenith.angle</dt>
<dd>numeric vector Angle in degrees for the
sun position. An argument should be passed to one and only one of
<code>elevation_angle</code> or <code>zenith_angle</code>.</dd>
<dt>occluded.value</dt>
<dd>numeric Value to return when elevation angle is
negative (sun below the horizon).</dd></dl>

Arguments

Relative Air Mass (AM) — relative_AM

<dl>

<dt>elevation.angle, zenith.angle</dt>
<dd>numeric vector Angle in degrees for the
sun position. An argument should be passed to one and only one of
<code>elevation_angle</code> or <code>zenith_angle</code>.</dd>


<dt>occluded.value</dt>
<dd>numeric Value to return when elevation angle is
negative (sun below the horizon).</dd>

</dl>

relative_AM: Relative Air Mass (AM)

Description

Usage

Arguments

Details

References

Examples