digital elevation model


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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 ?
Skidmore AK (1989) A comparison of techniques for calculating gradient and aspect from a gridded digital elevation model.
Initially developed to measure forest canopy or coastal erosion, the lidar has become a primary sensor to generate digital elevation models (i.
The Choice of Window Size in Approximating Topographic Surfaces from Digital Elevation Models.
Principle diagram for checking of digital elevation models
However, effective interpretation of digital elevation models (DEM) requires appropriate data visualisation.
Detailed resolution Digital Elevation Models (DEMs) are now available for extensive areas of Australia (Dowling et al.
The TanDEM-X Digital Elevation Model facilitates the interpretation of landscapes with exceptional detail, which is essential for military engineering projects and operational planning incl.
Even if a digital elevation model and camera parameters could be generated for the hand-painted panorama (see section "Altitude"), automatic suggestion of where shadow areas are located would be difficult as panorama painters sometimes use nonuniform lighting including cast shadows and possibly locally rotated light sources (Patterson 2000).
To what extent do the estimates of the slope and drainage area, and thus also the topographic wetness index, vary with the resolution of the digital elevation model for a peat land area?
Fugro EarthData announced today it has delivered the first tiles of updated orthoimagery and digital elevation model (DEM) for the Alaska Statewide Digital Mapping Initiative's (SDMI) multi-year program to develop new mapping of the entire state.
The map, known as a global digital elevation model, was created from images collected by the Japanese Advanced Spaceborne Thermal Emission and Reflection Radiometer, or ASTER, instrument aboard Terra.
Arshad Hussain Siraj was of the view that as Pakistan is frequently affected by such disastrous situations, it is recommended that Digital Elevation Model (DEM) generated from Panchromatic Remote Sensing Instrument for Stereo Mapping (PRISM) onboard ALOS along with other optical data can be effectively used for flood mapping along River Indus for identification of most vulnerable areas.

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