Generate a vector of USDA soil texture codes or class names, sorted according to approximate particle size
SoilTextureLevels(which = "codes", simplify = FALSE)'codes' (texture codes) or 'names' (texture class names)
Return 12-class factor levels (TRUE) or 21-class factor levels (default: FALSE)? The 12-class system does not separate sands, loamy sands and sandy loams into sand fraction variants (e.g. "very fine sandy loam" in the 21-class system is "sandy loam" in 12-class system)
an ordered factor
# class codes
SoilTextureLevels()
#> [1] cos s fs vfs lcos ls lfs lvfs cosl sl fsl vfsl l sil si
#> [16] scl cl sicl sc sic c
#> 21 Levels: cos < s < fs < vfs < lcos < ls < lfs < lvfs < cosl < sl < ... < c
# class names
SoilTextureLevels(which = 'names')
#> [1] coarse sand sand fine sand
#> [4] very fine sand loamy coarse sand loamy sand
#> [7] loamy fine sandy loamy very fine sand coarse sandy loam
#> [10] sandy loam fine sandy loam very fine sandy loam
#> [13] loam silt loam silt
#> [16] sandy clay loam clay loam silty clay loam
#> [19] sandy clay silty clay clay
#> 21 Levels: coarse sand < sand < fine sand < ... < clay
# simpler class names
SoilTextureLevels(which = 'names', simplify = TRUE)
#> [1] sand loamy sand sandy loam loam
#> [5] silt loam silt sandy clay loam clay loam
#> [9] silty clay loam sandy clay silty clay clay
#> 12 Levels: sand < loamy sand < sandy loam < loam < silt loam < ... < clay