IsoriX (version 0.4-1)

GetElev: Download an elevation raster from internet

Description

This function allows for the download of an elevation raster from internet. By default, it downloads the "Global Multi-resolution Terrain Elevation Data 2010" from our server. The file was orifginally downloaded from: http://topotools.cr.usgs.gov/gmted_viewer/ and converted into a tif file by us.

Usage

GetElev(
	path=NULL,
	address=NULL,
	overwrite=FALSE,
	verbose=interactive()
	)

Arguments

path

A string indicating where to store the file on the hard drive

address

A string indicating where to download the file from

overwrite

A logical indicating if an existing file should be re-downloaded

verbose

A logical indicating whether information about the progress of the procedure should be displayed or not while the function is running. By default verbose is TRUE if users use an interactive R session and FALSE otherwise.

Source

http://topotools.cr.usgs.gov/gmted_viewer/

Details

In the argument "path" is not provided, the file will be stored in the current working directory. The function can create new directories, so you can also indicate a new path. To download the elevation we prepared, leave the address to NULL.

Examples

## To download the high resolution
## raster in your current working
## directory, just type:
## GetElev()