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The slant distance s (chord length) between two points can be reduced to the arc length on the ellipsoid surface S as: [21] = (+) / / where R is evaluated from Earth's azimuthal radius of curvature and h are ellipsoidal heights are each point. The first term on the right-hand side of the equation accounts for the mean elevation and the second ...
More generally, a contour line for a function of two variables is a curve connecting points where the function has the same particular value. [2] In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. [3]
In other words, every point on the marked line of 100 m elevation is 100 m above mean sea level. These maps usually show not only the contours, but also any significant streams or other bodies of water , forest cover, built-up areas or individual buildings (depending on scale), and other features and points of interest such as what direction ...
A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame) is a global datum reference or reference frame for unambiguously representing the position of locations on Earth by means of either geodetic coordinates (and related vertical coordinates) or geocentric coordinates. [1]
Within its 2.02 km 2 territory, there is a difference of 140 m between its highest and lowest points, giving a ratio of 69 m for every km 2. In Australia 's 7,686,850 square kilometres (2,967,910 sq mi) area, there is only a 2,244 metres (7,362 ft) difference between the highest and lowest points, which gives a ratio of 292 micrometres (0.0115 ...
Mont Blanc's key col is a piece of low ground near Lake Onega in northwestern Russia (at 113 m (371 ft) elevation), on the divide between lands draining into the Baltic and Caspian Seas. This is the meeting place of two 113 m (371 ft) contours, one of them encircling Mont Blanc; the other contour encircles Mount Everest.
There may be obstructions or large changes of elevation between the endpoints. In these situations, extra setups are needed. Turning is a term used when referring to moving the level to take an elevation shot from a different location. To "turn" the level, one must first take a reading and record the elevation of the point the rod is located on.
The elevation of a geographic area may be stated in several ways. These include: The maximum elevation of the area (high point); [a] The minimum elevation of the area (low point); [b] The arithmetic mean elevation of the area (statistical mean elevation); [c] The median elevation of the area (statistical 50% elevation); [d] and; The elevation ...