The first 4 levels of the US Soil Taxonomy hierarchy (soil order, suborder, greatgroup, subgroup), presented as a data.frame (denormalized) and a list of unique taxa.
Usage
data(ST)Details
Ordered based on the unique letter codes denoting taxa from the 13th edition of the Keys to Soil Taxonomy.
References
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service. U.S. Department of Agriculture Handbook 436. https://www.nrcs.usda.gov/resources/guides-and-instructions/soil-taxonomy
Soil Survey Staff. 2014. Keys to Soil Taxonomy, 12th ed. USDA-Natural Resources Conservation Service, Washington, DC. https://www.nrcs.usda.gov/resources/guides-and-instructions/keys-to-soil-taxonomy