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 ?
as well as in generation and updating digital terrain models (Haala et al.
Topographic relationships can be further clarified in the lidar terrain model by overlaying the relief-shaded image with close interval (1m) raster contours generated from the digital terrain model.
The processing of the satellite images overtaken by SPOT 5 HRS allowed obtaining a highly precision digital terrain model.
For example, if the digital terrain model can be exported, the original terrain representation, at full resolution, can be extracted (in contrast to its multi-resolution model).
Although Meyer (1999) gives a review of the continuity properties of digital terrain models categorizing them according to their topological and continuity characteristics, Lam (1983, p.
Mathematical models of the accuracy of digital terrain model surfaces linearly constructed from square gridded data.
Derived from a radar-generated 2D road network combined with height information from the Company's NEXTMap digital terrain model, 3D Roads is the first accurate, seamless, and comprehensive collection of road data available to the region.
Procurement Acquisition Services of Producing A Digital Terrain Model By Scanning Aerial, Aerial Photography and Production of New Maps and Orthophotos for Approximately 50 000 Square Kilometers in Six Counties: Bihor, Arad, Hunedoara, Alba, Mures, Harghita Including Flood Zone with High Risk (The Area On the Border with the Republic of Hungary in Arad and Bihor) Representing Activity 1 of the Application Program, Part of the Financing Contract 169 01.
The goal is the capture of terrain heights by aerial survey using Airborne Laser Scanner for deriving an accurate digital terrain model (DTM) and Digital Surface Model (DOM) in Bavaria with a dot density of at least 4 points.
21 /PRNewswire-FirstCall/ -- NAVTEQ , a leading global provider of digital map data for location-based solutions and vehicle navigation, has announced the launch of Digital Terrain Model and Satellite Imagery which enable richer, more realistic map display in location-based and navigation applications.
NEXTMap USA's high-resolution digital terrain model (DTM) is hydro-enforced, with elevation points removed from the tops of bridges, culverts, and other selected drainage structures - perfectly suited for many Risk MAP updates throughout the country.
Intermap's precise and uniform 3-D digital terrain model serves as the foundation for the placement and alignment of aerial photography and other geospatial images.

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