dem {inldata}

Digital Elevation Model

Description

The digital elevation model (DEM) for the Idaho National Laboratory and its vicinity in eastern Idaho. A DEM is a representation of the land surface that uses a digital grid to describe the elevation values of the terrain.

Usage

dem

Format

A compressed SpatRaster class object with layer:

elevation

Land-surface elevations in feet above the North American Vertical Datum of 1988 (NAVD 88).

Source

The National Map (TNM) 1/3-arc-second DEM (Gesch, 2007; Gesch and others, 2002), accessed on August 4, 2020. This dataset can be downloaded in a Esri ArcGRID TM format using TNM Download. Elevation datasets are distributed in geographic coordinates in units of decimal degrees, and in conformance with the NAD 83. Elevation values are in feet above the NAVD 88.

References

Gesch, D.B., 2007, The National Elevation Dataset, in Maune, D., ed., Digital Elevation Model Technologies and Applications—The DEM User's Manual, 2nd ed.: Bethesda, Maryland, American Society for Photogrammetry and Remote Sensing, p. 99–118.

Gesch, D., Oimoen, M., Greenlee, S., Nelson, C., Steuck, M., and Tyler, D., 2002, The National Elevation Dataset: Photogrammetric Engineering and Remote Sensing, v. 68, no. 1, p. 5–11.

See Also

make_shade function for computing the hill shade from the DEM.

Examples

elevation <- terra::unwrap(dem)
print(elevation)