Digital Elevation Model format. Used by the US Geological Survey.
Digital Elevation Model that depicts landscape elevation. The data are developed by the USGS at either 10-meter or 30-meter grid spacing. Often used in a GIS as a data layer.
Digital elevation model. A raster storage method developed by the US Geological Survey (USGS) for elevation data.6 The format of the USGS Elevation data sets.
igital levation odel This term is used both generally and specifically. In a generic sense it refers a grid of point elevation data. In a specific sense it refers to a format used by the U. S. Geological Survey for this data. Data is available for download from the USGS at a scale of. 1:250,000. Bruce Giddings publishes a catalog of Digital Elevation Data. It can be found at the beginning of each month on the newsgroup: comp.infosystems.gis. MORE
(Digital Elevation Model) A digital file, usually in raster form, describing the terrain and elevation of a given area, often of a particular USGS quadrangle. DEM's are mostly used in GIS applications.
Digital elevation model. Arrays of topographic elevations at regularly spaced 30 meter (approximately 100 feet) intervals that correspond in coverage to standard 1:24,000-scale 7.5-minute quadrangles; produced by the U.S. Geological Survey and distributed in tape format.
digital elevation model. A regular pattern of ground elevation observations maintained in digital form. These can be used to generate contour lines and Triangulated Irregular Networks (TINs) which look like wire frame representations of the terrain. They are also used in the process of orthogonalizing air photos.
DIGITAL ELEVATION MODEL. A digital image of geographical features consisting of a grid, in which the colour of each cell reflects an average elevation above or below sea level. ( modèle altimétrique numérique (MAN))
Digital Elevation Model. A GIS raster layer representing elevation. This is a common GIS product created at a variety of scales.
is short for digital elevation model, a data exchange format developed by the United States Geological Survey for geographical and topographical data.
(Digital Elevation Model): it is a model of raster data representing the elevation of a terrain. It can be generated starting from dimensioned plans or from contour lines, and it is generally used to carry out visibility analyses,generate longitudinal profiles, carry out gradient and exposition analyses, slope measurements etc.
Digital Elevation Model. A 3-D model of the Earth's surface represented by masspoints and breaklines. Less rigorous (not as densely collected) than a DTM. A DEM does not support contour modeling and is primarily used for orthorectification of aerial photography to the Earth's surface.
Digital Elevation Model (see DTM).
digital elevation model - This term is used very generally to describe a great variety of terrain files and file formats. There are also a number of mutually incompatible file formats that use the .dem file name extension.
Digital Elevation Model. file with terrain elevations recorded at the intersections of a fine grid and organized by quadrangle to be the digital equivalent of the elevation data on a topographic base map.
Digital elevation model. A digital model of surface heights, often produced by using InSAR.
Digital Elevation Model. Terrain elevation data organized by quadrangle and provided in digital form.
Digital elevation model or digital terrain data. Digital representations of the land's surface.
Digital elevation model. This is used in the generic sense of a raster data set attempting to represent the elevation of the dry land surface. It does not imply any particular data format or collection methodology. It also does not include other forms of digital elevation data, such as digitized points or contours.
A collection of points that have elevations associated with them. Usually collected on a grid.
Digital Elevation Model, any digital representation of the earth's surface, but also a particular raster grid format used by the USGS and others
Digital Elevation Model data. A database of elevation data represented by a regularly-spaced set of x,y,z locations.
Digital Elevation Model. A computer representation of the terrain surface consisting of spot elevation data. DEM data can be used for orthophoto rectification, but is not adequate for contour determination.
Digital Elevation Model. A digital representation of a topographic surface. Elevation values may be stored in a regular grid of values, one for each cell, a regular lattice of points or in a 'triangulated irregular network' (TIN) of points.
Digital Elevation Model. See digital terrain model.
digital elevation model. A data file of a topographic surface arranged as a set of x,y,z coordinates where z represents surface elevation. It is the digital equivalent of the elevation data portrayed on a topographic base map.
Digital Elevation Model. Digital representation of the elevation of locations on the land surface. DEM is used in reference to a set of elevation values representing elevations at points in a grid on the Earth's surface.
Digital Elevation Model. A digital representation of the earth’s surface in terms of elevation values (X, Y, Z where Z represents the surface elevation)
DEM ( digital elevation model) data consists of a grid of regularly-spaced points giving the elevation of the surface of the earth in a certain region.
Digital Elevation Model format (U.S. Geological Survey)
Digital Elevation Model. A digital representation of a continuous variable over a two-dimensional surface by a regular array of z values referenced to a common datum. Digital elevation models are typically used to represent terrain relief. The format of the USGS digital elevation data sets.
digital elevation model. A digital cartographic/geographic dataset of elevations (topography) in xyz coordinates. The terrain elevations for ground positions are sampled at regularly-spaced horizontal intervals. DEMs are derived from contour lines and/or photogrammetric methods using USGS 7.5-minute, 15-minute, 2-arc-second (30- by 60-minute), and 1-degree (1:250,000-scale) topographic quadrangle maps. Digital elevation models are typically used to represent terrain relief.
See digital elevation model.
digital elevation model. a digital elevation model is a digital file consisting of terrain elevations for ground positions at regularly-spaced horizontal intervals.
Demonstration or USGS Map
Digital elevation model by which continuous surface such as terrain surface can be represented. DEM is used to interpolate elevation at arbitrary location using limited number of three dimensional terrain points.