翻訳と辞書 Words near each other ・ Polyedriopsis ・ Polyeidos ・ Polyeidos (poet) ・ Polyelasmoceratidae ・ Polyelectrolyte ・ Polyelectrolyte adsorption ・ Polyeleos ・ Polyembryoma ・ Polyembryony ・ Polyene ・ Polyene antimycotic ・ Polyenoic fatty acid isomerase ・ Polyenso ・ Polyergus ・ Polycomb-group proteins ・ Polyconic projection ・ Polyconvex function ・ Polycopidae ・ Polycoria ・ Polycornum ・ Polycotylidae ・ Polycotylus ・ Polycount ・ Polycracy ・ Polycrase ・ Polycrasta ・ Polycrates ・ Polycrates (disambiguation) ・ Polycrates (sophist) ・ Polycrates complex Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Polyconic projection ： ウィキペディア英語版 Polyconic projection Polyconic can refer either to a class of map projections or to a specific projection known less ambiguously as the American Polyconic. Polyconic as a class refers to those projections whose parallels are all non-concentric circular arcs, except for a straight equator, and the centers of these circles lie along a central axis. This description applies to projections in equatorial aspect.〔''An Album of Map Projections'' (US Geological Survey Professional Paper 1453), John P. Snyder & Philip M. Voxland, 1989, p. 4.〕 As a specific projection, the American Polyconic is conceptualized as "rolling" a cone tangent to the Earth at all parallels of latitude, instead of a single cone as in a normal conic projection. Each parallel is a circular arc of true scale. The scale is also true on the central meridian of the projection. The projection was in common use by many map-making agencies of the United States from the time of its proposal by Ferdinand Rudolph Hassler in 1825 until the middle of the 20th century.〔''Flattening the Earth: Two Thousand Years of Map Projections'', John P. Snyder, 1993, pp. 117-122, ISBN 0-226-76747-7.〕 The projection is defined by: :$x\; =\; \backslash cot(\backslash varphi)\; \backslash sin((\backslash lambda\; -\; \backslash lambda\_0)\backslash sin(\backslash varphi))\backslash ,$ :$y\; =\; \backslash varphi-\backslash varphi\_0\; +\; \backslash cot(\backslash varphi)\; (1\; -\; \backslash cos((\backslash lambda\; -\; \backslash lambda\_0)\backslash sin(\backslash varphi)))\backslash ,$ where $\backslash lambda$ is the longitude of the point to be projected; $\backslash varphi$ is the latitude of the point to be projected; $\backslash lambda\_0$ is the longitude of the central meridian, and $\backslash varphi\_0$ is the latitude chosen to be the origin at $\backslash lambda\_0$. To avoid division by zero, the formulas above are extended so that if $\backslash varphi\; =\; 0$ then $x\; =\; \backslash lambda\; -\; \backslash lambda\_0$ and $y\; =\; 0$. ==See also== * List of map projections 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polyconic projection」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.