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Keys to Soil Taxonomy Criteria (13th Edition)

Source: R/data-documentation.R
ST_criteria_13th.Rd

A lookup table relating taxon codes to specific criteria from the Keys to Soil Taxonomy (13th Edition)

Usage

data(ST_criteria_13th)

Format

An object of class list of length 3153.

Details

A list containing one element per taxon code at order to subgroup level. Each element contains a data.frame with 1 row per criterion, and 8 columns:

Each data.frame contains the following columns:

  • content (text content of criterion)

  • chapter (chapter number)

  • page (page number)

  • key (key name or level)

  • taxon (taxon name)

  • code (taxon code)

  • clause (sequence number of criterion within taxon)

  • logic (logical meaning of criterion)

    • One of:

      • FIRST (first)

      • OR (either this criterion OR the next criterion at same level)

      • END (end of hierarchical key)

      • NEW (go to new page/taxon specified)

      • AND (this criterion AND the next criterion at same level)

      • HAVE (criteria that must be met)

      • LAST (end of subgroup key)

References

Soil Survey Staff. 2022. Keys to Soil Taxonomy, 13th ed. USDA-Natural Resources Conservation Service. https://www.nrcs.usda.gov/resources/guides-and-instructions/keys-to-soil-taxonomy