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HWSD topsoil USDA texture code to texture-class crosswalk.

Source: R/datasets_balances.R
hwsd_texture_usda.Rd

Maps the HWSD (Harmonized World Soil Database) topsoil USDA texture code t_usda_tex (the TEXTURE_USDA field, integers 1 to 13) to the canonical USDA texture-class name keying soil_hydraulic_by_texture. read_soil_hydraulic() uses it to translate each grid cell's dominant HWSD texture code into its hydraulic properties. HWSD splits clay into a heavy-clay (code 1) and a light-clay (code 3) class; both map to the single USDA "clay" class of the standard 12-class system, matching how the WHEP HWSD preparation pipeline collapses them.

Usage

hwsd_texture_usda

Format

A tibble with columns:

t_usda_tex

HWSD topsoil USDA texture code (integer 1 to 13).

usda_texture_class

Canonical USDA texture class (snake_case), one of the classes in soil_hydraulic_by_texture.

Source

HWSD topsoil USDA texture-code legend as documented for the local HWSD extract in the WHEP spatial-input preparation pipeline (inst/scripts/prepare_spatialize_all.R), following the Harmonized World Soil Database version 2.0 D_TEXTURE_USDA class ordering. FAO & IIASA (2023). Harmonized World Soil Database version 2.0. Rome and Laxenburg. doi:10.4060/cc3823en .

Examples

hwsd_texture_usda
#> # A tibble: 13 × 2
#>    t_usda_tex usda_texture_class
#>         <int> <chr>             
#>  1          1 clay              
#>  2          2 silty_clay        
#>  3          3 clay              
#>  4          4 silty_clay_loam   
#>  5          5 clay_loam         
#>  6          6 silt              
#>  7          7 silt_loam         
#>  8          8 sandy_clay        
#>  9          9 loam              
#> 10         10 sandy_clay_loam   
#> 11         11 sandy_loam        
#> 12         12 loamy_sand        
#> 13         13 sand