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Also amphidrome and tidal node. A geographical location where there is little or no tide, i.e. where the tidal amplitude is zero or nearly zero because the height of sea level does not differ significantly at high tide and low tide, and around which a tidal crest circulates once per tidal period (approximately every 12 hours). The tidal amplitude increases, though not uniformly, with distance ...
A topographic survey is typically based upon a systematic observation and published as a map series, made up of two or more map sheets that combine to form the whole map. A topographic map series uses a common specification that includes the range of cartographic symbols employed, as well as a standard geodetic framework that defines the map ...
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.
For example, consider two mountains whose summits are both at 5,000 feet (1,500 m) in elevation, and between them is a low point at an elevation of 2,000 feet (610 m). If a climber starts their journey at an elevation of 1,000 feet (300 m), their CAG is 4,000 feet (1,200 m) by the time they reach the first summit (i.e. 5,000 ft less 1,000 ft).
In aviation, the term elevation or aerodrome elevation is defined by the ICAO as the highest point of the landing area. It is often measured in feet and can be found in approach charts of the aerodrome. It is not to be confused with terms such as the altitude or height. [1] Part of a topographic map of Haleakala , showing elevation.
The topographic elevation of a summit measures the height of the tip of a mountain above a geodetic sea level. [b] [c] The first table below ranks the 100 highest major summits of the United States by elevation. The topographic prominence of a summit is a measure of how high the summit rises above its surroundings.