Add `SoilTaxonomyLevels()`

ncss-tech / SoilTaxonomy

A System of Soil Classification for Making and Interpreting Soil Surveys

https://ncss-tech.github.io/SoilTaxonomy/

GNU General Public License v3.0

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Closed brownag closed 1 year ago

brownag commented 1 year ago

get ordinal or nominal factors with taxonomic groups as labels
will be useful for applications like SoilTaxonomyDendrogram() in {sharpshootR}