digital elevation model

(redirected from Digital Surface 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 providing images which can be combined with the digital surface model (DSM) to create a 3D visualisation of the landscape, the imagery can assist in the subsequent processing of the data to remove surface features and generate a digital terrain model (DTM).
This paper outlines a methodology for semi-automatically extraction (the operator provides seed points) of buildings using a region-growing algorithm and line detection methods applied over a digital surface model.
The main scientific field of using the LiDAR data in geodesy and remote sensing is to construct the digital heights models (digital elevation models, digital terrain models, digital surface models, digital relief models) (Arrowsmith 2006; El-Sheimy et al.
Intermap's countrywide NEXTMap datasets include uniformly reliable digital surface models (DSMs) that include cultural features (such as vegetation, buildings, and roads), digital terrain models (DTMs) that display the bare earth (with all cultural features digitally removed) and orthorectified radar images (ORIs) corrected to remove normal geometric distortions (grayscale images that accentuate topographic features).
Now, network planners can easily retrieve highly reliable profile data between towers, based on NEXTMap digital surface models (1-meter or better vertical accuracy) that include cultural features such as vegetation, buildings, and roads.
Orthophotos, contour maps, point clouds, digital surface models (DSMs) and feature maps can easily be created from aerial images using the Trimble Business Center photogrammetry module.
Sourced from the present ComputaMaps 3D City Planner and textured building databases, the new product line includes digital terrain models (DTM), digital height models (DHM) and digital surface models (DSM).
The Company's countrywide NEXTMap datasets include uniformly reliable digital surface models that include cultural features (such as vegetation, buildings, and roads), digital terrain models that display the bare earth (with all cultural features digitally removed) and orthorectified radar images corrected to remove normal geometric distortions (grayscale images that accentuate topographic features).
Surveyors can produce deliverables, including georeferenced orthophotos, 3D point clouds and digital surface models directly from Trimble Business Center.
Intermap's NEXTMapdatabase includes digital surface models (DSMs) that include cultural features such as vegetation, buildings, and roads; digital terrain models (DTMs) with all cultural features digitally removed; and orthorectified radar images (ORIs) that accentuate topographic features - all with a vertical accuracy of 1 meter or better.
Under the terms of the agreement, GeoEye will supply high-quality Earth imagery, digital surface models and other mapping data to help Geostellar dramatically expand its service.
NEXTMap USA will ultimately generate an elevation for the nation dataset at unprecedented accuracy and detail that includes 3D digital terrain models, digital surface models, contours, 3D road centerline geometries, and other high-resolution geospatial products as part of the Company's proactive mapping program.

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