Elevation

Elevation's on the Rise. When first responders rushed into the aftermath of September 11, geospatial information was among the first types of intelligence they demanded. In New York, decision makers specifically requested elevation data.

Elevation histogram of the surface of the Earth - approximately 71% of the Earth's surface is covered with water. For other uses, see Elevation (disambiguation).

Digital Elevation Models The most basic and interesting geographical data type is the digital elevation model (DEM).

Digital Elevation Model The digital elevation model (DEM) below of Marmot Basin in Jasper National Park is viewed, in perspective, as a 300 metre gridded wire frame.

Digital Elevation Models (DEMs) are a type of raster GIS layer. Raster GIS represents the world as a regular arrangement of locations. In a DEM, each cell has a value corresponding to its elevation.

Elevation data is used to create DEMs. A figure showing contour data is shown below. The first shows contour data as a set of lines which connect places of equal height. fig. 1 contour map of Bellarine Peninsula ...

elevation the vertical distance from a datum, usually the MSL, to a point or object on the earth's surface (not to be confused with altitude, which refers to points or objects above the earth's surface) ell ...

Elevation on topographic maps can be indicated in various ways. The most commonly used method is to plot contour lines joining points of equal height or depth. The difference in elevation between contour lines is known as the contour interval.

Elevations at individual points (commonly in systematic arrays or grids of geographic significance) as surveyed on the Earth's surface, or calculated by stereoplotters, or digitized from existing maps can be expressed in digital numbers.

Elevations The height of a feature above mean sea level is called an elevation. We use the elevation of features in our everyday lives for example to build roads and in all types of construction.

Elevation - The elevation grid was derived from the US Geological Survey's 1 x 1 km hydrologically correct digital elevation model (DEM) for North America, downloaded from the USGS web site.

Elevation contours, measured spot elevations, streams, and lakes in this map have all been used as input to create a surface.

Elevation extremes: lowest point: Ruggeller Riet 430 m highest point: Grauspitz 2'599 m AMSL Natural resources: hydroelectric potential, arable land ...

elevation See Also : altitude, vertical geodetic datum [geodesy] The vertical distance of a point or object above or below a reference surface or datum (generally mean sea level). Elevation generally refers to the vertical height of land.

Elevation A vertical distance below or above a reference surface (usually mean sea level). Entity In cartography, a real world object that cannot be further subdivided into similar objects, for example a road, or a building.

Elevation mask Elevation mask is an adjustable feature of GPS receivers that specifies a satellite must be a certain number of degrees above the horizon before its signals are used for positioning.

Elevation-Flow Outfall Condition Users can now simulate backwater effects at an outfall by entering an elevation-flow curve to define the tailwater level at an outfall. Named Views ...

Elevation - The vertical distance or height above a datum. Ellipsoid - The "imaginary" or "mathematical" surface of the Earth used by surveyors for the computation of geodetic and astronomic coordinates. See also Geodesy, Geoid and Spheroid.

Elevation Matrix Processing System EMR Dept. of Energy, Mines and Resources Canada; Electromagnetic radiation ...

2. An elevation database for elevation data by map sheet from the National Mapping Division of the U.S. Geological Survey (USGS). DLG ...

stereo elevation An elevation surface derived from stereo pairs of remote sensing imagery. For example the SPOT satellite can collect an "off nadir" image and then in a subsequent fly-over collect its counterpart to make a stereo pair.

DIGITAL ELEVATION MODELS (DEMs) A DEM is an image that contains topographic information. These are available for free download (at a low 1 km resolution), or at higher resolutions for a cost.

Digital Elevation Model (DEM): 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.

Digital elevation file formats The official USGS DEM format, although destined to become an antique, is still widespread. A lot of GIS software reads some variant of this format directly.

digital elevation model (DEM) A regular pattern of ground elevation observations maintained in digital form.

Digital Elevation Model (DEM) - A 3-D model of the earth's surface represented by masspoints and breaklines. Less rigorous (not as densely collected) than a DTM.

Digital Elevation Model DIGEST Digital Geographic Information Exchange Standard ...

Digital elevation model (DEM): A quantitative model of landform in digital form. Also digital terrain model (DTM). Digital: ...

Digital Elevation Model (DEM) Terrain elevation data organized by quadrangle and provided in digital form. Digital Terrain Model (DTM) A three-dimensional model of the Earth's surface, provided in digital form.

Digital Elevation Model (DEM) A topographic surface arranged in a data file as a set of regularly spaced x, y, z coordinates where z represents elevation.

Digital elevation model, map (image), and vector data Raster data type consists of rows and columns of cells, with each cell storing a single value. Raster data can be images (raster images) with each pixel (or cell) containing a color value.

Digital Elevation Model (DEM) - The digital cartographic representation of the surface of the earth or a subsurface feature through a series of three-dimensional coordinate values.

Digital Elevation Data Elevation, slope, and aspect can be important information for a variety of wildlife applications of GISs.

Color the elevations of the topographic map, then answer questions about the map. Answers Color the elevations of the topographic map, interpret the map and answer questions. Answers ...

A digital elevation model produced by the Survey Branch of the United States Department of the Interior, consisting of a regular array of elevations referenced in the Universal Transverse Mercator (UTM) coordinate system.

DEM- Digital Elevation Model. A GIS raster layer representing elevation. This is a common GIS product created at a variety of scales.

Z-value The elevation value of a surface at a particular x, y location. May also be referred to as a spot height or spot elevation.

snow line The elevation at which snow persists throughout the year. snowfields Expanses of snow that lie above the snow line.

Figure 10a. An elevation image classified from a satellite image of Minnesota exists in a different scale and projection than the lines on the digital file of the State and province boundaries.

41 a framework for recording spot elevations in a regular rectangular grid (matrix); an acronym originally created from Digital Elevation Model at US Geological Survey.

Location may be annotated by x,y, and z coordinates of longitude, latitude, and elevation, or by such systems as ZIP codes or highway mile markers. Any variable that can be located spatially can be fed into a GIS.

Stage The elevation of the water surface in a stream channel. Standard Atmospheric Pressure A pressure of 101.32 kilopascals or 1013.2 millibars. Standard Deviation A statistical measure of the dispersion of observation values in a data set.

The terms contour or contour line is most commonly used for lines connecting points on the ground having the same elevation.

map hypsographic Map showing relief with elevations referred to the national geodetic vertical datum of 1929. map, hypsometric Map showing relief by any convention, such as contours, hachures, shading, or tinting.

An imaginary line on the ground, all points of which are at the same elevation, usually expressed as a length or elevation above some datum such as mean sea level. control point.

The vertical datum for each file was transformed from WGS84 to NADV88 using the Recalculate Elevation Values function in ERDAS Imagine.

A map that shows the change in elevation over a geographic area through the use of contour lines. The contour lines trace points of equal elevation across the map. See also: contour line and contour map. Topography: ...

reference data European term for a collaborative effort to create a widely available source of basic geographic data, providing national or European coverage of a set of common digital geographic data such as Elevation, Transportation, Hydrography, ...

Use the maximum and minimum elevations along your line of section to determine how long to draw these lines.

Identification of what type of vegetation is located where, along with slope, aspect, elevation, and the presence of water Impact of human habitation on the environment, e.g.

orthogonally rectified image from the original perspective image captured by the sensor. These inputs are the following: 1) the unrectified raster image scanned from the diapositive or directly acquired from a digital sensor, 2) a digital elevation ...

the coverage of each air photo as accurately as possible within the NAPL On-Line application, the outline depicted is a theoretical "footprint" based on a number of variables such as aircraft altitude, camera focal length and ground elevation.

DEM is short for digital elevation model, a data exchange format developed by the United States Geological Survey for geographical and topographical data.

Raster data model. Continuous numeric values, such as elevation, and continuous categories, such as vegetation types, are represented using the raster model. Learn more. Raster or Vector?

Gnomonic projection on an icosahedron, poles on faces, color-coded topography, original elevation data by USGS's EROS Data Center (201 KB PDF) Low Resolution Maps Gnomonic projection on an icosahedron, poles on vertices, flat-colored (38 KB) ...

* A Theme is a single layer of spatial information e.g., elevation. The ArcView Application Window / Interface: ...

See also: Image, Information, Map, Surface, Model