ST_criteria_13th {SoilTaxonomy} | R Documentation |
Keys to Soil Taxonomy Criteria (13th Edition)
Description
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