digital elevation model

(redirected from DEM)
Also found in: Dictionary, Financial, Acronyms, Idioms, Wikipedia.

digital elevation model

A digital map of the elevation of an area on the earth. The data are either collected by a private party or purchased from an organization such as the U.S. Geological Survey (USGS) that has already undertaken the exploration of the area. Digital elevation models are gray scale images wherein the pixel values are actually elevation numbers. The pixels are also coordinated to world space (longitude and latitude), and each pixel represents some variable amount of that space (foot, meter, mile, etc.) depending on the purpose of the model and land area involved. See remote sensing and GIS glossary.


Sample Digital Elevation Model Rendering
This scene was rendered from a USGS digital elevation model of the Grand Canyon by the RiverTools application from Rivix, LLC, Broomfield, CO (www.rivix.com). RiverTools was written in IDL, a programming language from Research Systems, Inc. that is specialized for image processing and visualization. The black area is the Colorado River at the bottom of the canyon. The red is the immediate surrounding riverbank. (Image courtesy of Research Systems, Inc. and Rivix, LLC.)
References in periodicals archive ?
The inherent errors in a DEM are subsequently propagated in the computed topographic attributes.
We are sure our partnership will be successful in establishing Rocky DEM as a flagship product in particle simulation, and CADFEM as a preferred service provider for our CAE customers," says Madhukar.
Andrew originally wanted to track down LI8 DEM, but had to settle for LI6 DEM, with a strategically-placed screw making the 6 look like a B.
We compared the heights values recorded in each DEM by statistical tests (GraphPad InStat v3.
Given the demand for a product such as the SRTM DEM, it is important to examine carefully the quality of the dataset (Smith and Sandwell, 2003; Rabus et al.
1 release of DEM also includes support for Avaya Modular Messaging, a standards-basedIP voice and fax messaging platform, as well as improved security and scalability.
This explains why the DEM of pearlitic, grades of ductile iron is greater than those of ferritic iron and why, as the density of ductile iron increases, so does resonant frequency and DEM.
Already DEM Solutions' EDEM software is being applied by blue chip customers across the pharmaceutical, chemical, mining, agriculture, and geo-technical engineering industries.
We are pleased to be working on the Bluestreak DEM platform," said Milton Diaz, BBiTV's chief technology officer.
DEM is the result of multi-year development effort to bring new capabilities to digital cable.
Bluestar charter developers are creating innovative games, services and applications for digital cable that take advantage of the DEM platform and its broad distribution.