altitude
See Also: elevation
[coordinate systems] The height or vertical elevation of a point above a reference surface. Altitude measurements are usually based on a given reference datum, such as mean sea level.
Altitude is the elevation of a point or object from a known level or datum (plural: data). Common data are mean sea level and the surface of the WGS-84 geoid, used by GPS. In aviation, altitude is measured in feet.
Altitude
La hauteur d'un point au-dessus du niveau moyen de la mer est appelée altitude. Tous les jours, nous utilisons le concept d'altitude, que ce soit pour construire des routes, d'autres ouvrages ou à diverses fins.
altitude
Altitude is the height of an area, measured from sea level.
Antarctic Circle
The Antarctic Circle is an imaginary circle at latitude 66°30' S, around the south pole.
altitude -- elevation above or below a reference datum, as defined in Federal Information Processing Standard 70-1. See also elevation.
altitude
the vertical angle that is measured between the plane of the observer's true horizon and a line to the object
ambiguity resolution ...
Altitudes
Definition
The vertical distance of a point or a level, on or affixed to the surface of the earth, measured from mean sea level ...
Altitude
The vertical distance of a point either on or above the surface of the earth from mean sea level. The term can also be used to measure the angle of a celestial body above the visible horizon.
Arctic Circle - Antarctic Circle ...
Altitude resolution:
Surface: varies by country
Seabed: Not applicable (a colorscale approximating sea floor depth is "printed" on the spherical surface).
Low Altitude Mapping Photogrammetry
LAMPS
Laser-scan Automated Map Production System ...
High Altitude Aerial Photo (1:141000)
10-4: There is an easy way to determine whether a scale is large, medium, or small, by looking at its stated value, e.g., 1: 30,000. Propose a simple rule for this. ANSWER ...
High altitude biome dominated by a few species of dwarf shrubs, a few grasses, sedges, lichens, and mosses. Productivity is low in this biome because of the extremes of climate. Quite similar to tundra.
...
Radar Minimum Altitude Charts are supplementary charts to help flight crews monitor and cross check altitudes while under radar control.
Radar Minimum Altitude Charts
Charts for Visual Flight Rules (VFR) ...
The user should be aware that taken into account the shadowing effect of relief can slow down the speed of computing especially when the sun altitude is low.
slope, drainage area per unit contour length, and the topographic index for a series of depressionless square-grid DEMs at scales of 2, 4, 10, 30, and 90 m using the GRID tools in ARC/INFO and spot elevation data obtained from low-altitude aerial ...
Dsb arises from the same scenario as Dsa, but at even higher altitudes, and chiefly in North America since here the Mediterranean climates extend further poleward than in Eurasia; Mazama, Washington is one such location.
It can withstand: humidity, sand and dust, vibration, altitude, shock, high temperature, low temperature, temperature shock. The Archer PDA is also: waterproof to IP67 and shockproof.
For example, satellites using GPS Standard Positioning Service signals, orbiting at around 700 kilometer altitude, ...
The slope and aspect of an elevation surface (altitude derived from a surveyed points or rectified aerial photos) identifies terrain steepness and orientation; example uses include road-building and water runoff modeling ...
A DEM normally consists of a regular matrix of elevation values, from which altitude functions such as slope and aspect can be calculated, and which may be rendered for visualisation as isolines (contours), perspective or panoramic views, etc.
Location information (latitude, longitude, altitude) is then sent back to the network in response to the location request.
The GALILEO system is composed of 30 satellites on 3 circular orbits at an altitude of 24000 km to cover all the terrestrial surface. This satellites will be supported by an international network of terrestrial stations.
GPS satellites are orbiting the Earth at an altitude of 11,000 miles. The DOD can predict the paths of the satellites vs. time with great accuracy. Furthermore, the satellites can be periodically adjusted by huge land-based radar systems.
The primary source of aerial photography to be used is the National Aerial Photography Program (NAPP) and National High Altitude Photography (NHAP) imagery.
Today, graphic display techniques such as shading based on altitude in a GIS can make relationships among map elements visible, heightening one's ability to extract and analyze information.
Despite popular conceptions and illustrations, many satellites cruise at relatively low orbits, nearly grazing Earth's top atmosphere: a typical average altitude for Mir and the International Space Station is 390 km, ...
Geostationary Operational Environmental Satellites (GOES) orbit the earth at an altitude of 36,000 km in the same direction as the earth's rotation. In this orbit, they maintain a stationary position relative to the earth (geostationary orbit).
It is a system developed by the United States Department of Defense that is based on a constellation of satellites orbiting the Earth at very high altitudes. Abbreviated GPS.
The control stations use precise RADAR equipment to determine each satellite's location, altitude, and velocity. The monitor stations also measure signals from the satellites which are incorporated into orbital models for each satellites.
NAPP photography is quarter-quadrangle centered (3.75-minutes of latitude by 3.75-minutes of longitude in geographic extent) and taken at an aircraft altitude of approximately 20,000 feet above mean terrain using a 152-millimeter focal-length camera.
Unlike the Mercator projection, the Robinson projection has both the lines of altitude and longitude are evenly spaced across the map.
View the atmospheric ozone readings obtained only at altitudes between 10,000 and 15, 000 meters by loading a theme of all ozone readings. Set the definition to include only those at the desired altitudes.
Things to watch out for ...
The latitude, longitude, and altitude of a point. An estimate of error is often associated with a position.
Positional Dilution of Precision (PDOP)
Measure of the geometrical strength of the GPS satellite configuration.
a full range of spatial resolutions, depending on altitude, characteristics of instrument
data model:
data is captured exclusively in raster form (pixels)
classified images may be converted to vector form for output, or for input to GIS systems ...
21 of these satellites are in primary operation, while 3 serve as spares. The satellites orbit the earth twice a day at an altitude of 10,900 miles. This high altitude assures that the orbits remain stable and precise.
They orbit at altitudes of about 12,000 miles each. Each satellite contains four precise atomic clocks (Rubidium and Cesium standards) and has a microprocessor on board for limited self-monitoring and data processing.
A global navigation system based on 24 or more satellites orbiting the earth at an altitude of 12,000 statue miles and providing very precise, worldwide positioning and navigation information 24 hours a day, in any weather.
Height above or below sea level. For example, resources describing altitude, bathymetry, digital elevation models, slope, and products derived from this information.
Environment ...
Contour - An imaginary outline of points on the ground which are at the same altitude relative to mean sea level.
Contour Line - A line on a map or chart that connects to points which are at the same elevation.
They provide flight data information (altitude, lift rate, etc.) combined with moving map displays when used with GPS units. They also provide the all-important flight data recording needed in contests. -- tip of the hat to Alex Curlyo ...
Light Detection and Ranging (LIDAR) - A laser swath is emitted and the return beam is sensed, usually by a low-altitude aircraft.
your map in detail to see if there is any relationship between slope aspect (north facing, west facing, etc.), general vegetation type (you don't need to know specific plant names, just generalities such as trees, sagebrush, grass, etc.), altitude, ...
Information must be received from three satellites in order to obtain two-dimensional (latitude and longitude) fixes, and four satellites are required for three-dimensional (latitude, longitude and altitude) positioning.
altimeter Instrument for measuring altitudes or elevations with respect to a reference level, usually mean sea level. The most common type is an aneroid barometer.
 See also: Information, Area, Cover, Surface, Image
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