vislim

0th

Percentile

R function for computing the limit of visibility of an object given its height

The function allows to plot the angular size of an object (in degrees) against the distance from the observer, and to compute at which distance from the observer the angular size of the object hits the limit of human visual acuity (0.01667 degrees).

Keywords
vislim
Usage
vislim(vis.degree = 0.01667, targ.h)
Arguments
vis.degree

Limit of human visual acuity (0.01667 by default).

targ.h

Target size (=height in meters).

Details

The function returns: -a plot displaying the decay in angular size as function of the object's distance from the observer; a black dot represents the distance at which the angular size hits the limit of human visual acuity; -the value (in km) of the visibility limit.

Aliases
  • vislim
Examples
# NOT RUN {
# calculate the visibility limit of an object of size 6m, and store the result (20.62 km)
#in the 'limit' object
limit <- vislim(targ.h=6)

# }
Documentation reproduced from package GmAMisc, version 1.0.0, License: GPL (>= 2)

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