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 ?
Digital elevation model, slope map, aspect map, shaded relief, topographic profiles, basin, satellite super impose map, geomorphologic map of Pravara River basin is created by using GIS technologies (Wawale, 2012).
(A) Folding of digital elevation models (DEMs) for slopes proposals and (B), storage areas generated from contour lines I: Upper view; II: Cut; A: Area; Z: Depth
c) Catchment area of the Munda Dam watershed is computed from DEM (Digital Elevation Model) using Hydrology tool in ArcGIS.
The input file for the is an MDE based on the original digital elevation model Shuttle Radar Topography Mission (SRTM) provided by the United States Geological Survey (USGS), with a spatial resolution of 3 arc-seconds (90 metres) (KRETSCH, 2000).
Digital elevation models (DEMs) are imperative in the field of geosciences and have been used widely in the generation and display of three-dimensional terrain.
"The Digital Elevation Model (DEM), which represents the elevation of the surface of the earth can be used effectively to know the areas prone to flooding using Geographic Information System (GIS)."
Digital Elevation Model (DEM) Extraction From Google Earth: A Study in Sungai Muar Watershed: Geoinformation--Catalyst for planning, development and good governance, Applied Geoinformatics for Society and Environment (AGSE); 32-36.
Combined with the Spot constellation and new German radar imaging satellites from Infoterra GMbH, Astrium Geo Services offer in 2014 a new World Digital Elevation Model (DEM) service at two-metre (relative) vertical accuracy, challenging aerial photography especially for larger areas.
Different digital elevation model datasets agree well in altitude but significantly differ in their derivative parameters, which introduces significant errors in the estimation of surface-received solar radiation and data from river networks.
Many studies have identified the impact of analysis scale via the effect of digital elevation model (DEM) resolution on geomorphic models (e.g.
Digital terrain model (DTM) or digital elevation model (DEM) contains height values of terrain and needs for evaluation getting qualitative mapping product from images.

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