Craig retroazimuthal projection

Craig retroazimuthal projection
Craig retroazimuthal projection centered on Mecca.

The Craig retroazimuthal map projection was created by James Ireland Craig in 1909. It is a cylindrical projection preserving the direction from any place to another, predetermined place while avoiding some of the bizarre distortion of the Hammer retroazimuthal projection. It is sometimes known as the Mecca projection because Craig, who'd worked in Egypt as a cartographer, created it to help Muslims find their qibla. The projection is defined by:

x = \lambda\,
y = \frac\lambda{\sin(\lambda)}(\sin(\phi)\cos(\lambda) - \tan(\phi_0) \cos(\phi))\,


given latitude ϕ, longitude relative to the fixed location λ, and latitude of the fixed location ϕ0. For λ = 0 take λ / sin(λ) = 1, its continuous completion.[1]

References

  1. ^ Flattening the Earth: Two Thousand Years of Map Projections, John P. Snyder, 1993, pp. 227-228, ISBN 0-226-76747-7.

External links


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • James Craig — may refer to:* James Craig (architect) (1739 ndash;1795), Scottish architect * James Henry Craig (1748 ndash;1812), British military officer and colonial administrator of The Canadas * James Craig (Irish politician), UK MP for the Irish… …   Wikipedia

  • Map projection — A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy s Geography and using his second map projection A map projection is any method of representing the surface of a sphere or other …   Wikipedia

  • List of cartographers — Cartography is the study of map making and cartographers are map makers. Contents 1 Before 1400 2 15th century 3 16th century 4 17th century …   Wikipedia

  • List of graphical methods — This is a list of graphical methods with a mathematical basis.Included are diagram techniques, chart techniques, plot techniques, and other forms of visualization.There is also a list of computer graphics and descriptive geometry topics.imple… …   Wikipedia

  • World map — This article is about maps of the Earth. For other uses, see World map (disambiguation). Historical map of the world by Ortelius, 1570 CE A world map is a map of the surface of the Earth, which may be made using any of a number of different map… …   Wikipedia

  • Qibla — For the Shi a militant group in South Africa, see Qibla (group). Current Qiblah of Islam is the direction towards the Kaaba The Qiblah (Arabic: قبلة‎, direction ), also transliterated as Qibla, Kiblah or Kibla, is the direction that sh …   Wikipedia

  • Qibla compass — A qibla compass or qiblah compass (sometimes also called qibla/qiblah indicator) is a modified compass used by Muslims to indicate the direction to face to perform ritual parayers. In Islam, this direction is called qibla, and points towards the… …   Wikipedia

  • Ретроазимутальная проекция Крейга — Проекция Крейга с центром в Мекке Ретроазимутальная проекция Крейга  картографическая проекция, созданная …   Википедия

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”