get_ssurgo_study_area

A Raster* or Spatial* object to serve 
as a template for cropping. If missing, whose study area is returned

template

A character string indicating the SSURGO study area to be downloaded.

area

A character string indicating the date of the most recent update to the SSURGO 
area for these data. This information may be gleaned from the SSURGO Inventory (<code><a rd-options="" href="/link/get_ssurgo_inventory?package=FedData&version=2.0.8" data-mini-rdoc="FedData::get_ssurgo_inventory">get_ssurgo_inventory</a></code>).

date

A character string indicating where raw downloaded files should be put.
The directory will be created if missing.

raw.dir


<code>get_ssurgo_study_area</code> returns a named list of length 2:
<ol>
<li> "spatial": A <code>SpatialPolygonsDataFrame</code> of soil mapunits 
in the template, and 
</li>
<li> "tabular": A named list of <code><a rd-options="" href="/link/data.frame?package=FedData&version=2.0.8" data-mini-rdoc="FedData::data.frame">data.frame</a>s</code> with the SSURGO tabular data.
</li>
</ol><p></p><p></p>

Functions to automate downloading geospatial data available from
several federated data sources (mainly sources maintained by the US Federal
government). Currently, the package allows for retrieval of five datasets:
The National Elevation Dataset digital elevation models (1 and 1/3 arc-second;
USGS); The National Hydrography Dataset (USGS); The Soil Survey Geographic
(SSURGO) database from the National Cooperative Soil Survey (NCSS), which is
led by the Natural Resources Conservation Service (NRCS) under the USDA; the
Global Historical Climatology Network (GHCN), coordinated by National Climatic
Data Center at NOAA; and the International Tree Ring Data Bank. Additional
data sources are in the works, including global DEM resources (ETOPO1, ETOPO5,
ETOPO30, SRTM), global soils (HWSD), MODIS satellite data products, the National
Atlas (US), Natural Earth, PRISM, and WorldClim.

get_ssurgo_study_area: Download and crop the spatial and tabular data for a SSURGO study area.

Description

Usage

Arguments

Value