% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/SSURGO_FUNCTIONS.R
\name{get_ssurgo}
\alias{get_ssurgo}
\title{Download and crop data from the NRCS SSURGO soils database.}
\usage{
get_ssurgo(template, label, raw.dir = "./RAW/SSURGO",
  extraction.dir = paste0("./EXTRACTIONS/", label, "/SSURGO"),
  force.redo = FALSE)
}
\arguments{
\item{template}{A Raster* or Spatial* object to serve 
as a template for cropping; optionally, a vector of area names [e.g., c('IN087','IN088')] may be provided.}

\item{label}{A character string naming the study area.}

\item{raw.dir}{A character string indicating where raw downloaded files should be put.
The directory will be created if missing. Defaults to './RAW/SSURGO/'.}

\item{extraction.dir}{A character string indicating where the extracted and cropped SSURGO shapefiles should be put.
The directory will be created if missing. Defaults to './EXTRACTIONS/SSURGO/'.}

\item{force.redo}{If an extraction for this template and label already exists, should a new one be created? Defaults to FALSE.}
}
\value{
A named list containing the 'spatial' and 'tabular' data.
}
\description{
This is an efficient method for spatially merging several different soil survey areas
as well as merging their tabular data.
}
\details{
\code{get_ssurgo} returns a named list of length 2:
\enumerate{
\item 'spatial': A \code{SpatialPolygonsDataFrame} of soil mapunits 
in the template, and 
\item 'tabular': A named list of \code{\link{data.frame}s} with the SSURGO tabular data.
}
}
\examples{
\dontrun{
# Extract data for the Village Ecodynamics Project 'VEPIIN' study area:
# http://village.anth.wsu.edu
vepPolygon <- polygon_from_extent(raster::extent(672800,740000,4102000,4170000), 
     proj4string='+proj=utm +datum=NAD83 +zone=12')

# Get the NRCS SSURGO data (USA ONLY)
SSURGO.VEPIIN <- get_ssurgo(template=vepPolygon, label='VEPIIN')

# Plot the VEP polygon
plot(vepPolygon)

# Plot the SSURGO mapunit polygons
plot(SSURGO.VEPIIN$spatial, lwd=0.1, add=T)

# Or, download by Soil Survey Area names
SSURGO.areas <- get_ssurgo(template=c('CO670','CO075'), label='CO_TEST')

# Let's just look at spatial data for CO675
SSURGO.areas.CO675 <- SSURGO.areas$spatial[SSURGO.areas$spatial$AREASYMBOL=='CO075',]

# And get the NED data under them for pretty plotting
NED.CO675 <- get_ned(template=SSURGO.areas.CO675, label='SSURGO_CO675')

# Plot the SSURGO mapunit polygons, but only for CO675
plot(NED.CO675)
plot(SSURGO.areas.CO675, lwd=0.1, add=T)
}
}