aqp: horizonColorIndices – R documentation

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horizonColorIndices

Horizon Color Indices

Description

Calculate basic horizon-level color indices for a SoilProfileCollection. Basic indices do not require aggregation over the whole profile or comparison to a "reference" (e.g. parent material) color. Includes Hurst (1977) Redness Index, Barron-Torrent Redness Index (1986) and Buntley-Westin Index (1965). This is a wrapper method around several horizon-level indices. See the individual functions for more details.

Usage

horizonColorIndices(p, hue = "m_hue", value = "m_value", chroma = "m_chroma")

Arguments

`p`	A SoilProfileCollection
`hue`	Column name containing moist hue; default: "m_hue"
`value`	Column name containing moist value; default: "m_value"
`chroma`	Column name containing moist chroma; default: "m_chroma"

Value

A data.frame containing unique pedon and horizon IDs and horizon-level color indices.

Author(s)

Andrew G. Brown.

Examples

data(sp1)

# promote sp1 data to SoilProfileCollection
depths(sp1) <- id ~ top + bottom

# move site data
site(sp1) <- ~ group

# compute indices
# merged into `sp1` with left-join on hzidname(sp1)
horizons(sp1) <- horizonColorIndices(sp1, hue="hue", value="value", chroma="chroma")

# visualize
par(mar=c(0, 1, 3, 1))
plot(sp1, color='hurst_redness')
plot(sp1, color='barron_torrent_redness')
plot(sp1, color='buntley_westin')

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