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
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DIGITAL ELEVATION DATA AND GIS PROJECTS
Robert De Sawal U.S.GeologicalSurvey PO BOX 25046,MS-520 Denver,Colorado 80225 303-202-4804 fax 303-202-4504 e-mail rfdesawal@usgs.gov
ABSTRACT ...
A digital elevation model (DEM) is a digital representation of ground surface topography or terrain. It is also widely known as a digital terrain model (DTM).
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.
can use the elevation of the nearest point, but this leads to sharp changes of elevation halfway between points
instead, the normal approach is to fit a plane to the nearby raster points, and use it to estimate elevation at any point ...
5 minute (10 Meter) Digital Elevation Models (DEM's) Type_of_Source_Media: physical drive Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 19950101 Source_Currentness_Reference: ground condition ...
The difference between the topographic elevation and the ellipsoid is called the ellipsoid height.
The difference between the topographic elevation and the geoid is called the orthometric height.
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 data usually takes the form of irregular or regular spaced points. Irregularly space points are stored in a Triangular Irregular Network (TIN).
Elevation extremes:
lowest point: Ruggeller Riet 430 m
highest point: Grauspitz 2'599 m AMSL
Natural resources: hydroelectric potential, arable land ...
elevation -- conforming to Federal Information Processing Standard 70-1, the term "altitude" is used in this standard, rather than the common term elevation.
Elevation
Height above or below sea level. For example, resources describing altitude, bathymetry, digital elevation models, slope, and products derived from this information.
Environment ...
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 distance above or below mean sea level.
Ellipsoid
A geometric surface, all of whose plane sections are either ellipses or circles.
Elevation Profile Segmentation
Slope is a critical factor in both siting and operating a pipeline. In general, crossing areas of steep slopes are avoided whenever possible when designing new routes.
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 Provides the elevation of the query point.
Color Category Provides the surface color (as RGB) of the query point.
XY Dist from Prev Provides the horizontal distance (XY) between the current and the previous query points.
USA Elevation
30-meter elevation data for the contiguous United States; intended for 3D terrain visualization.
Get instructions on how to use this map service.
digital elevation model
The digital cartographic representative of the surface of the Earth or a subsurface feature through a series of three-dimensional coordinate values: a continuous variable over a two-dimensional surface by a regular array ...
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 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 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 (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 (DEM) - A 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 (DEM) 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 Data
Elevation, slope, and aspect can be important information for a variety of wildlife applications of GISs.
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, given in an AutoCAD DXF (Drawing eXchange File) as 3D contour lines,
Land cover (CORINE), given in ESRI Shape file
As, Zn, etc. measurements at sample points as an ascii file
location of pit-heaps ...
Elevation is usually shown using contour lines. In simplistic terms a contour line is a line which joins points of equal elevation.
elevation
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
Often used interchangeably with altitude, elevation refers to the vertical distance above or below mean sea level, of a point on the surface of the earth.
Ephemeris ...
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.
Elevation Matrix Processing System
EMR
Dept. of Energy, Mines and Resources Canada; Electromagnetic radiation ...
High-Elevation Mask. To obtain the highest possible level of accuracy and repeatability for the system, the system is operated in differential mode with a reference station set up at a convenient location on the course.
2. An elevation database for elevation data by map sheet from the National Mapping Division of the U.S. Geological Survey (USGS).
DLG ...
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
Descriptive Data
Tabular data describing the geographic characteristics of map features. Can include numbers, text, images, and CAD drawings about features.
Digital Elevation Models or DEM have two types of displays. The first is 30-meter elevation data from 1:24,000 seven-and-a-half minute quadrangle map. The second is the 1:250,000 3 arc-second digital terrain data.
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
...
Advanced Elevation Series Promotion
Order any Very High Precison DSM/DTM before December 15, 2011 ad receive a complimentary Advanced Ortho Image.
>> Learn More ...
Elevation
TIPS
DFIRM
GIS Applications
Locate Childcare Providers
Tax Rate Lookup
Locate Healthcare Professionals and Facilities
Locate Registered Sex Offenders
Voter Registration Information Lookup
Premier VW Suppliers Sites & Buildings ...
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.
spot elevation Point on a map or chart whose height above a specified datum is noted, usually by a dot or a small sawbuck and elevation value.
snow line The elevation at which snow persists throughout the year.
snowfields Expanses of snow that lie above the snow line.
Hypsometric tints The technique of colouring in elevation ranges between contour lines to enhance the visual picture of a landscape.
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.
The terms contour or contour line is most commonly used for lines connecting points on the ground having the same elevation.
DEM See digital elevation model. demand 1. In allocation, the potential for using a portion of the supply of a resource or commodity.
2.
" DEM Digital elevation model, a data exchange format developed by the United States Geological Survey for geographical and topographical data. DEMTS Digital and Electronic Maps Transfer Standard. Interchange of digital maps.
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: ...
HYDRO 1k Elevation Derivative FREE GLOBAL Datasets...
Public Data Sets on Amazon Web Services
Global 30 Arc-second Elevation Data : GTOPO30
GeoNetwork - The portal to FREE spatial data and i...
Global Map and Data from International Steering Co...
 See also: Information, Model, Map, Surface, Area
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