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 ?
Keywords: Slope, aspect, geographical information system, hill shade, digital terrain Model and shuttle radar topographic mission.
and Stec, M.: 2013, Accuracy assessment of digital terrain model constructed from the direct data.
Digital terrain model (DTM) or digital elevation model (DEM) contains height values of terrain and needs for evaluation getting qualitative mapping product from images.
Satellite imagery to obtain more detailed topographic information for the Greenvale and Lucknow areas has been completed and processed to provide an up to date digital terrain model (DTM).
The study involved thousands of measurements taken in 2007, which were used build a digital terrain model of the 21-acre (5.8-hectare) site.
The processed data will be used to provide a seamless digital terrain model (DTM) from onshore and offshore data.
A detailed digital terrain model is created from the height measurements and the aerial photograph, captured at the same time as the height data, is draped over it.
According to the company, Intermap's 3-D digital terrain model serves as the foundation for the placement and alignment of aerial photography and other geospatial images.
Of particular interest is the subtle difference between a Digital Elevation Model (DEM), a Digital Surface Model (DSM) and a Digital Terrain Model (DTM).Chapter 1 then lays out a number of vital considerations for project planning and provides an overview for acquiring reliable data.
To generate this simulated perspective with 40-meter-per-pixel resolution, ESA scientists used data from three of the HRSC's nine stereo channels to create a digital terrain model. These channels provide downward, backward, and forward views, which provide a perspective so that image-processing software can combine the pictures into a three-dimensional landscape.
Geological information was entered to build up on screen a 3D digital terrain model of the post-glacial land surface, in turn matched to the National Grid.

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