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 ?
Intermap will immediately deliver the digital elevation maps from its library of off-the-shelf radar images and elevation models.
Some of the premier ADL collections include digital elevation maps and graphics of the United States, imagery from more than eight hundred expeditions by the Scripps Institution of Oceanography, and world maps from the United States Central Intelligence Agency.
By automating and streamlining time-consuming database creation tasks such as obtaining and processing imagery and digital elevation maps, creating and placing 3D objects (trees, shrubs, and buildings), classifying materials in the imagery, and generating run-time databases, EarthScape 3D reduces the cost and time required to produce databases with high image content.
TRW built the electro-optical camera that will provide cartography data for developing digital elevation maps of the Korean peninsula for land use and planning purposes.

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