Retrieve Soil Series Extent Maps from SoilWeb

This function downloads a generalized representations of a soil series extent from SoilWeb, derived from the current SSURGO snapshot. Data can be returned as vector outlines (sf object) or gridded representation of area proportion falling within 800m cells (SpatRaster object). Gridded series extent data are only available in CONUS. Vector representations are returned with a GCS/WGS84 coordinate reference system and raster representations are returned with an Albers Equal Area / NAD83 coordinate reference system (EPSG:5070).

Usage

seriesExtent(
  s,
  type = c("vector", "raster"),
  timeout = 60,
  as_Spatial = getOption("soilDB.return_Spatial", default = FALSE)
)

Arguments

s

a soil series name, case-insensitive

type

series extent representation, 'vector': results in an sf object and 'raster' results in a SpatRaster object

timeout

time that we are willing to wait for a response, in seconds

as_Spatial

Return sp (SpatialPolygonsDataFrame) / raster (RasterLayer) classes? Default: FALSE.

Value

An R spatial object, class depending on type and as_Spatial arguments

References

https://casoilresource.lawr.ucdavis.edu/see/

Author

D.E. Beaudette

Examples

if (FALSE) {
  
  # specify a soil series name
  s <- 'magnor'
  
  # return an sf object
  x <- seriesExtent(s, type = 'vector')
  
  # return a terra SpatRasters
  y <- seriesExtent(s, type = 'raster')
  
  library(terra)
  if (!is.null(x) && !is.null(y)) {
    x <- terra::vect(x)
    # note that CRS are different
    terra::crs(x)
    terra::crs(y)
  
    # transform vector representation to CRS of raster
    x <- terra::project(x, terra::crs(y))
  
    # graphical comparison
    par(mar = c(1, 1 , 1, 3))
    plot(y, axes = FALSE)
    plot(x, add = TRUE)
  }
}