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The Schmidt net's horizontal axis can then be used as a scalar measuring device to convert the point's latitude (relative to the pole) into a radial distance from the centre of the circle. Alternatively, the Schmidt net could be replaced entirely with a correctly projected polar grid, and grid squares from a map re-drawn into this disc.
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The universal polar stereographic (UPS) coordinate system is used in conjunction with the universal transverse Mercator (UTM) coordinate system to locate positions on the surface of the Earth. Like the UTM coordinate system, the UPS coordinate system uses a metric-based cartesian grid laid out on a conformally projected surface.
This special graph paper is called a stereonet or Wulff net, after the Russian mineralogist George (Yuri Viktorovich) Wulff. [18] The Wulff net shown here is the stereographic projection of the grid of parallels and meridians of a hemisphere centred at a point on the equator (such as the Eastern or Western hemisphere of a planet).
English: Diagrams of the Universal Polar Stereographic coordinate system (UPS) whose two plane grids covers the Arctic and the Antarctic. Svenska: Diagram över koordinatsystemet Universal Polar Stereographic (UPS) vars två plana koordinatsystem täcker Arktis och Antarktis.
A polar grid with several angles, increasing in counterclockwise orientation and labelled in degrees. The radial coordinate is often denoted by r or ρ, and the angular coordinate by φ, θ, or t. The angular coordinate is specified as φ by ISO standard 31-11. However, in mathematical literature the angle is often denoted by θ instead.
English: Polar coordinates grid A two-dimensional coordinate system in mathematics. Date: 4 September 2014, 15:33:46: Source: Author: Fred the Oyster
The projection appears in many Renaissance maps, and Gerardus Mercator used it for an inset of the north polar regions in sheet 13 and legend 6 of his well-known 1569 map. In France and Russia this projection is named "Postel projection" after Guillaume Postel , who used it for a map in 1581. [ 4 ]