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Get Geomorphic/Surface Morphometry Data from Soil Data Access

Source: R/get_SDA_cosurfmorph.R
get_SDA_cosurfmorph.Rd

Get Geomorphic/Surface Morphometry Data from Soil Data Access or a local SSURGO data source and summarize by counts and proportions ("probabilities").

Usage

get_SDA_cosurfmorph(
  table = c("cosurfmorphgc", "cosurfmorphhpp", "cosurfmorphss", "cosurfmorphmr"),
  by = "mapunit.mukey",
  areasymbols = NULL,
  mukeys = NULL,
  WHERE = NULL,
  method = c("bygroup", "none"),
  include_minors = TRUE,
  miscellaneous_areas = FALSE,
  representative_only = TRUE,
  db = c("SSURGO", "STATSGO"),
  dsn = NULL,
  query_string = FALSE
)

Arguments

table

Target table to summarize. Default: "cosurfmorphgc" (3D Geomorphic Component). Alternate choices include cosurfmorphhpp (2D Hillslope Position), cosurfmorphss (Surface Shape), and cosurfmorphmr (Microrelief).

by

Grouping variable. Default: "mapunit.mukey"

areasymbols

A vector of soil survey area symbols (e.g. 'CA067')

mukeys

A vector of map unit keys (e.g. 466627)

WHERE

WHERE clause added to SQL query. For example: areasymbol = 'CA067'

method

character. One of: "ByGroup", "None"

include_minors

logical. Include minor components? Default: TRUE.

miscellaneous_areas

logical. Include miscellaneous areas (non-soil components) in results? Default: FALSE.

representative_only

logical. Include only representative Component Parent Material Groups? Default: TRUE.

db

Either 'SSURGO' (default) or 'STATSGO'. If 'SSURGO' is specified areasymbol = 'US' records are excluded. If 'STATSGO' only areasymbol = 'US' records are included.

dsn

Path to local SSURGO database SQLite database. Default NULL uses Soil Data Access.

query_string

Return query instead of sending to Soil Data Access / local database. Default: FALSE.

Value

a data.frame containing the grouping variable (by) and tabular summaries of counts and proportions of geomorphic records.

Details

Default table="cosurfmorphgc" summarizes columns geomposmntn, geomposhill, geomposflats, and geompostrce. table="cosurfmorphhpp" summarizes "hillslopeprof", table="cosurfmorphss" summarizes shapeacross and shapedown, and table="cosurfmorphmr" summarizes geomicrorelief.

Queries are a generalization of now-deprecated functions from sharpshootR package by Dylan Beaudette: geomPosMountainProbability(), geomPosHillProbability(), surfaceShapeProbability(), hillslopeProbability()

Similar summaries of SSURGO component surface morphometry data by series name can be found in fetchOSD(, extended=TRUE) or downloaded from https://github.com/ncss-tech/SoilWeb-data Full component data including surface morphometry summaries at the "site" level can be obtained with fetchSDA().

See also

fetchSDA() get_SDA_pmgroupname()

Author

Dylan E. Beaudette, Andrew G. Brown

Examples

if (FALSE) { # \dontrun{
 # Summarize by 3D geomorphic components by component name (default `by='compname'`)
 get_SDA_cosurfmorph(WHERE = "areasymbol = 'CA630'")

 # Whole Soil Survey Area summary (using `by = 'areasymbol'`)
 get_SDA_cosurfmorph(by = 'areasymbol', WHERE = "areasymbol = 'CA630'")

 # 2D Hillslope Position summary(using `table = 'cosurfmorphhpp'`)
 get_SDA_cosurfmorph('cosurfmorphhpp', WHERE = "areasymbol = 'CA630'")

 # Surface Shape summary (using `table = 'cosurfmorphss'`)
 get_SDA_cosurfmorph('cosurfmorphss', WHERE = "areasymbol = 'CA630'")

 # Microrelief summary (using `table = 'cosurfmorphmr'`)
 get_SDA_cosurfmorph('cosurfmorphmr', WHERE = "areasymbol = 'CA630'")
} # }