Simulate plausible soil colors based on proportions by Munsell "chip", or using a seed Munsell chip and threshold specified via CIE2000 color contrast metric.

simulateColor(method = c("dE00", "proportions"), n, parameters, SPC = NULL)

Arguments

method

simulation method, see details

n

number of simulated colors per horizon

parameters

a list, format depends on method:

  • proportions: output from aggregateColor

  • dE00: formatted as list(m = '7.5YR 3/3', thresh = 5, hues = c('7.5YR'))

Where m is a single representative Munsell chip, thresh is a threshold specified in CIE2000 color contrast (dE00), and hues is a vector of allowed Munsell hues.

SPC

SoilProfileCollection, attempt to modify SPC with simulated colors

Value

a list, unless SPC is specified, then a SoilProfileCollection object

Author

D.E. Beaudette

Examples


# m: representative or most likely color
# thresh: dE00 threshold
# hues: allowed Munsell hues
p <- list(
  'A' = list(m = '7.5YR 3/3', thresh = 5, hues = c('7.5YR')),
  'BA' = list(m = '7.5YR 4/4', thresh = 8, hues = c('7.5YR')),
  'Bt1' = list(m = '7.5YR 4/4', thresh = 8, hues = c('5YR', '7.5YR')),
  'Bt2' = list(m = '5YR 4/5', thresh = 8, hues = c('5YR', '7.5YR')),
  'Bt3' = list(m = '10YR 4/6', thresh = 10, hues = c('10YR', '7.5YR')),
  'Cr' = list(m = '2.5G 6/2', thresh = 15, hues = c('2.5G', '2.5GY', '2.5BG'))
)

# simulate
(cols <- simulateColor(method = 'dE00', n = 10, parameters = p))
#> $A
#>  [1] "7.5YR 3/4" "7.5YR 3/3" "7.5YR 3/3" "7.5YR 3/3" "7.5YR 3/3" "7.5YR 3/3"
#>  [7] "7.5YR 3/2" "7.5YR 3/4" "7.5YR 3/3" "7.5YR 3/4"
#> 
#> $BA
#>  [1] "7.5YR 4/4" "7.5YR 4/4" "7.5YR 4/5" "7.5YR 4/6" "7.5YR 4/3" "7.5YR 4/2"
#>  [7] "7.5YR 4/4" "7.5YR 4/4" "7.5YR 4/6" "7.5YR 4/4"
#> 
#> $Bt1
#>  [1] "5YR 4/4"   "7.5YR 4/4" "5YR 4/5"   "7.5YR 4/4" "5YR 4/6"   "7.5YR 4/4"
#>  [7] "5YR 4/4"   "7.5YR 4/3" "7.5YR 4/3" "7.5YR 4/6"
#> 
#> $Bt2
#>  [1] "5YR 4/4" "5YR 4/5" "5YR 4/6" "5YR 4/5" "5YR 4/3" "5YR 4/5" "5YR 4/5"
#>  [8] "5YR 4/5" "5YR 4/7" "5YR 4/5"
#> 
#> $Bt3
#>  [1] "10YR 4/12"  "10YR 3/7"   "10YR 4/12"  "7.5YR 4/13" "10YR 4/6"  
#>  [6] "10YR 4/8"   "7.5YR 4/8"  "10YR 4/8"   "10YR 3/9"   "10YR 4/11" 
#> 
#> $Cr
#>  [1] "2.5G 7/1"  "2.5G 5/2"  "2.5G 6/2"  "2.5G 6/2"  "2.5G 6/1"  "2.5G 5/1" 
#>  [7] "2.5BG 5/1" "2.5G 5/1"  "2.5G 6/4"  "2.5GY 7/3"
#> 

# preview
previewColors(parseMunsell(unlist(cols)), method = 'MDS')


# another example, this time using a larger dE00 threshold
p <- list(
  'A' = list(m = '7.5YR 3/3', thresh = 20, hues = c('10YR', '7.5YR', '5YR'))
)

# simulate
set.seed(54654)
cols <- simulateColor(method = 'dE00', n = 200, parameters = p)

# flatten
cols <- unlist(cols)

# tabulate, sort: most frequent color should be 7.5YR 3/3
sort(table(cols), decreasing = TRUE)
#> cols
#>  7.5YR 3/3   10YR 2/3    5YR 3/3  7.5YR 3/2  7.5YR 3/6   10YR 3/3   10YR 4/3 
#>         20          7          7          5          5          4          4 
#>    5YR 3/4    5YR 3/5  7.5YR 3/4   10YR 2/1   10YR 2/4   10YR 2/7   10YR 3/1 
#>          4          4          4          3          3          3          3 
#>  10YR 3/10   10YR 3/5    5YR 4/8    5YR 4/9  7.5YR 2/2  7.5YR 3/1  7.5YR 3/5 
#>          3          3          3          3          3          3          3 
#>   10YR 1/3   10YR 3/2   10YR 3/6   10YR 3/9   10YR 4/1   10YR 4/7   10YR 5/2 
#>          2          2          2          2          2          2          2 
#>    5YR 1/3    5YR 1/4    5YR 2/2    5YR 2/3    5YR 2/4    5YR 2/5    5YR 3/2 
#>          2          2          2          2          2          2          2 
#>    5YR 3/9   5YR 4/11    5YR 4/3    5YR 4/4    5YR 4/5    5YR 5/2  7.5YR 2/5 
#>          2          2          2          2          2          2          2 
#>  7.5YR 2/6  7.5YR 3/7  7.5YR 3/9  7.5YR 4/2  7.5YR 4/4  7.5YR 4/9  7.5YR 5/4 
#>          2          2          2          2          2          2          2 
#>   10YR 1/2   10YR 1/4   10YR 2/2   10YR 2/5   10YR 3/4   10YR 3/7   10YR 3/8 
#>          1          1          1          1          1          1          1 
#>  10YR 4/10  10YR 4/11  10YR 4/12   10YR 4/6   10YR 4/8   10YR 4/9   10YR 5/3 
#>          1          1          1          1          1          1          1 
#>   10YR 5/4    5YR 1/1    5YR 1/2    5YR 1/5    5YR 1/7    5YR 2/1   5YR 2/10 
#>          1          1          1          1          1          1          1 
#>    5YR 2/6    5YR 2/7    5YR 2/8    5YR 3/1   5YR 3/12    5YR 3/8    5YR 4/1 
#>          1          1          1          1          1          1          1 
#>   5YR 4/13   5YR 4/14    5YR 4/2    5YR 4/6    5YR 4/7    5YR 5/3    5YR 5/4 
#>          1          1          1          1          1          1          1 
#>    5YR 5/5  7.5YR 1/1  7.5YR 1/2  7.5YR 1/3  7.5YR 2/3  7.5YR 2/7  7.5YR 3/8 
#>          1          1          1          1          1          1          1 
#>  7.5YR 4/1 7.5YR 4/10 7.5YR 4/13  7.5YR 4/5  7.5YR 4/6 
#>          1          1          1          1          1 

# review colors
previewColors(parseMunsell(cols))


# what does a dE00 threshold look like on 3 pages of hue?
contrastChart('7.5YR 3/3', hues = c('10YR', '7.5YR', '5YR'), thresh = 20)