DEM: Example Digital Elevation Model
Description
The west, east, north, and south bounding coordinates are about
-115.4, -111.4, 44.5, and 42.2 decimal degrees, respectively.
Grid resolution is 500 by 500 meter.format
An object of SpatialGridDataFrame-class with 323,724
points (coordinates) and a single data attribute (elevation).
Geographic coordinates are in units of meters, in conformance
with the North American Datum of 1927, and placed in a
Albers Equal-Area Conic projection; standard parallels 42.83, 44.16;
central meridian -113.00, false easting 200,000 meters; false northing 0.source
The National Elevation Dataset (http://ned.usgs.gov/{NED})
1-arc-second raster. Dataset resampled to 10 arc-seconds using a
cubic convolution assignment.