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).

seriesExtent(s, type = c("vector", "raster"), timeout = 60)

Arguments

s

a soil series name, case-insensitive

type

series extent representation, vector results in a SpatialPolygonsDataFrame object and raster results in a raster object

timeout

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

References

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

Author

D.E. Beaudette

Examples

# \donttest{
if(requireNamespace("curl") &
   requireNamespace("sf") &
   requireNamespace("terra") &
   curl::has_internet()) {
  
  # required packages
  library(sf)
  library(terra)
  
  # 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')
  
  if (!is.null(x) && !is.null(y)) {
    # note that CRS are different
    sf::st_crs(x)
    terra::crs(y)
  
    # transform vector representation to CRS of raster
    x <- sf::st_transform(x, terra::crs(y))
  
    # graphical comparison
    par(mar = c(1, 1 , 1, 3))
    plot(y, axes = FALSE)
    
    # no fill color
    plot(x['series'], add = TRUE, col = NA)
  }
  
}
#> Linking to GEOS 3.8.0, GDAL 3.0.4, PROJ 6.3.1; sf_use_s2() is TRUE
#> terra 1.5.34

# }