| 单词 | zenithal projection |
| 释义 | > as lemmaszenithal projection zenithal projection n. [compare French projection zénithale (1866 or earlier)] any of a class of map projections in which a portion of the globe is projected on to a plane tangential to a point on that portion, usually made the centre of the map; also called azimuthal projection.Common forms are the zenithal (or azimuthal) equal-area projection, devised by the Swiss mathematician Johann Heinrich Lambert in 1772, and the zenithal (or azimuthal) equidistant projection. ΘΚΠ the world > the earth > earth sciences > geography > map-making > map > [noun] > projection > types of planispherea1393 Mercator's projection1615 Mercator's chart1645 Mercator1694 Bonne projection1854 zenithal projection1877 1877 Geogr. Mag. Mar. 81/2 Lambert's Zenithal Projection resulted in a far less amount of distortion than those of Sanson or Bonne. 1882 T. Craig Treat. on Projections v. 89 The name zenithal projections is..derived from the fact that they can always be considered as the representation of the hemisphere situated above the horizon of the given point, and having the zenith for pole. 1974 Encycl. Brit. Micropædia IV. 587/3 Gnomic map, type of zenithal projection in which the Earth's grid is projected by radials from a point at the centre of the sphere into a tangent plane so that all great circles are represented by straight lines. 2004 Publ. Astron. Soc. Pacific 116 971/1 We derive the exact..transformations for the zenithal projections most commonly used in astronomy. < as lemmas |
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