download_ned_tile

A character string representing the desired resolution of the NED. "1"
indicates the 1 arc-second NED (the default), while "13" indicates the 1/3 arc-second dataset.

An integer representing the northing (latitude, in degrees north of the equator) of the northwest corner of the tile to 
be downloaded.

tileNorthing

An integer representing the westing (longitude, in degrees west of the prime meridian) of the northwest corner of the tile to 
be downloaded.

tileWesting

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

raw.dir


Tiles are specified by a resolution, northing, and westing; northing and westing refer to the 
northwest corner of each NED tile, in degrees; tiles are 1x1 degree.
Tiles are downloaded in zipped ESRI ArcGrid format. <code>downloadNED</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_ned_tile: Download a zipped tile from the 1 (~30 meter) or 1/3 (~10 meter) arc-second National Elevation Dataset.

Description

Usage

Arguments

Value