get_ssurgo

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.

template

A character string naming the study area.

label

A character string indicating where raw downloaded files should be put.
The directory will be created if missing. Defaults to "./RAW/SSURGO/".

raw.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/".

extraction.dir

If an extraction for this template and label already exists, should a new one be created? Defaults to FALSE.

force.redo

This is an efficient method for spatially merging several different soil survey areas
as well as merging their tabular data.

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: Download and crop data from the NRCS SSURGO soils database.

Description

Usage

Arguments

Value

Details