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In modern mapping, a topographic map or topographic sheet is a type of map characterized by large-scale detail and quantitative representation of relief features, usually using contour lines, but historically using a variety of methods. Traditional definitions require a topographic map to show both natural and artificial features. 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 projection, coordinate system, ellipsoid and geodetic datum. Official topographic maps also adopt a national grid referencing system.
In the mountaineering parlance of the Western United States, a fourteener is a mountain peak with an elevation of at least 14,000 ft (4267 m). The 96 fourteeners in the United States are all west of the Mississippi River. Colorado has the most (53) of any single state; Alaska is second with 29. Many peak baggers try to climb all fourteeners in the contiguous United States, one particular state, or another region.
In topography, prominence measures the height of a mountain or hill's summit relative to the lowest contour line encircling it but containing no higher summit within it. It is a measure of the independence of a summit. A peak's key col is a unique point on this contour line and the parent peak is some higher mountain, selected according to various criteria.
Wheeler Peak is the tallest mountain in the Snake Range and in White Pine County, in Nevada, United States. The summit elevation of 13,065 feet (3,982 m) makes it the second-highest peak in Nevada, just behind Boundary Peak. With a topographic prominence of 7,563 feet (2,305 m), Wheeler Peak is the most topographically prominent peak in White Pine County and the second-most prominent peak in Nevada, just behind Mount Charleston. The mountain is located in Great Basin National Park and was named for George Wheeler, leader of the Wheeler Survey of the late 19th century.
Mount Ritter is the highest mountain in Madera County, California, in the Western United States, at an elevation of 13,149 feet (4,008 m). It is also the highest and most prominent peak of its namesake, the Ritter Range, a subrange of the Sierra Nevada in the Ansel Adams Wilderness of the Inyo and Sierra National Forests. Mount Ritter is the 15th highest mountain peak in California with at least 500 meters of topographic prominence.
Ruby Dome is the highest mountain in both the Ruby Mountains and Elko County, in Nevada, United States. It is the twenty-seventh-highest mountain in the state, and also ranks as the thirteenth-most topographically prominent peak in the state. The peak is located about 21 miles (34 km) southeast of the city of Elko within the Ruby Mountains Ranger District of the Humboldt-Toiyabe National Forest. The mountain rises from a base elevation of about 6,000 feet (1,800 m) to a height of 11,387 feet (3,471 m). It is the highest mountain for over 90 miles in all directions.
The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface . The term elevation is mainly used when referring to points on the Earth's surface, while altitude or geopotential height is used for points above the surface, such as an aircraft in flight or a spacecraft in orbit, and depth is used for points below the surface.
References
- "Nevada County High Points". Peakbagger.com. Retrieved 2014-01-28.