aqp: contrastClass – R documentation

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contrastClass

Soil Color Contrast

Description

Determine soil color contrast class according to methods outlined in the Soil Survey Manual. This function is typically called from colorContrast() which is simpler to use and provides more information.

Usage

contrastClass(v1, c1, v2, c2, dH, dV, dC, verbose = FALSE)

Arguments

`v1`	Munsell value of first color
`c1`	Munsell chroma of first color
`v2`	Munsell value of second color
`c2`	Munsell chroma of second color
`dH`	delta Hue
`dV`	delta Value
`dC`	delta Chroma
`verbose`	return a list for testing rules/cases

Details

This function is fully vectorized but expects all inputs have the same length.

Value

A vector of color contrast classes (ordered factor). A list when verbose is TRUE.

Author(s)

D.E. Beaudette

References

Soil Survey Technical Note 2

Examples

## standard use, result is an ordered factor
# 10YR 6/3 vs 5YR 3/4
contrastClass(v1=6, c1=3, v2=3, c2=4, dH=2, dV=3, dC=1)

## verbose output, useful for testing rules/cases
# 10YR 6/3 vs 5YR 3/4
contrastClass(v1=6, c1=3, v2=3, c2=4, dH=2, dV=3, dC=1, verbose = TRUE)

aqp

Algorithms for Quantitative Pedology

v1.29

GPL (>= 3)

Authors

Dylan Beaudette [aut, cre], Pierre Roudier [aut, ctb], Andrew Brown [aut, ctb]

Initial release

2021-04-05