View source: R/fragmentSieve.R
fragmentSieve | R Documentation |
Sieve applies thresholds to a numeric vector of fragment diameter values, returning fragment size classes. Particle diameter thresholds are evaluated as d < threshold
.
fragmentSieve(
diameter,
sieves = NULL,
ordered = FALSE,
prefix = "",
new_names = NULL,
...
)
diameter |
numeric. Vector of diameters of coarse fragments to "sieve". Default |
sieves |
leave as |
ordered |
logical. Return as an ordered factor. |
prefix |
character. Add a prefix to result names? Default: |
new_names |
Optional: apply new labels to result classes. Should match length of |
... |
additional arguments to |
character. Size class labels based on names of sieves
, new_names
, and prefix
(if specified).
Soil Science Division Staff. 2017. Soil survey manual. C. Ditzler, K. Scheffe, and H.C. Monger (eds.). USDA Handbook 18. Government Printing Office, Washington, D.C.
fragmentClasses()
# use a simplified version of the USDA system
# common within NRCS/SPSD and NCSS
fragmentSieve(c(30, 125, 180, 500, 1000))
# pararock fragments
fragmentSieve(c(30, 125, 180, 500, 1000), prefix = 'para')
# result as an ordered factor
fragmentSieve(c(30, 125, 180, 500, 1000), ordered = TRUE)
# USDA system, flat size classes
fragmentSieve(c(30, 125, 180, 500, 1000), flat = TRUE)
# alternative classification systems
fragmentSieve(c(30, 125, 180, 500, 1000), sys = 'usda')
fragmentSieve(c(30, 125, 180, 500, 1000), sys = 'international')
fragmentSieve(c(30, 125, 180, 500, 1000), sys = 'unified')
fragmentSieve(c(30, 125, 180, 500, 1000), sys = 'aashto')
fragmentSieve(c(30, 125, 180, 500, 1000), sys = 'mod.wentworth')
# custom fragment labels / diameter
fragmentSieve(
c(30, 125, 180, 500, 1000),
sieves = c(clumps = 50, chunks = 300, blocks = 100000)
)
# unnamed sieves, generic labels used
fragmentSieve(c(10, 50), sieves = c(30, 70))
fragmentSieve(c(10, 50), sieves = c(30, 70), ordered = TRUE)
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