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.)
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References in periodicals archive ?
The digital surface model is produced using GNSS positions of the UAV combined with photo matching and the ground control targets.
Supplier shall be required to provide the services of field survey to establish Ground Control Points (GCP),acquisition of stereo satellite imagery, Digital Surface Model (DSM) , Digital Terrain Model (DTM), Normalized Digital Surface Model (NDSM), Contour map and Orthorectified imagery.
When it comes to creating Digital Surface Models (DSM), LIDAR is increasingly the technology of choice.
A series of thirty-eight land use polygons were identified using the orthophotography developed from the LiDAR Digital Surface Model (DSM).
This means that we can satisfy the stylists' requirements, at the same time as producing highly accurate 3D digital surface model data for use in the detail engineering design and manufacturing processes.
Parallel imaging was used to auto-generate Digital Surface Model (DSM) planes consisting of point clouds.
In some sense the open space 3D model is similar, for example, to the Digital Surface Model (DSM) or to the obstacles limitation map of the airport area (Terrain 2011).

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