download_nhd_subregion

A 4-character string indicating the HUC4 NHD subregion to download.

area

A character string defining the resolution of the NHD to download.
Either "medium" (the default), or "high".

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

raw.dir


HUC4 subregion are specified by a unique character string, best obtained using the <code><a rd-options="" href="/link/get_huc4?package=FedData&version=2.0.8" data-mini-rdoc="FedData::get_huc4">get_huc4</a></code> function.
<code>download_nhd_subregion</code> returns the path to the downloaded zip file.


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.

download_nhd_subregion: Download a zipped NHD HUC4 subregion.

Description

Usage

Arguments

Value