Mercator's projection


Mercator's projection
Projection Pro*jec"tion, n. [L. projectio: cf. F. projection.] [1913 Webster] 1. The act of throwing or shooting forward. [1913 Webster]

2. A jutting out; also, a part jutting out, as of a building; an extension beyond something else. [1913 Webster]

3. The act of scheming or planning; also, that which is planned; contrivance; design; plan. --Davenant. [1913 Webster]

4. (Persp.) The representation of something; delineation; plan; especially, the representation of any object on a perspective plane, or such a delineation as would result were the chief points of the object thrown forward upon the plane, each in the direction of a line drawn through it from a given point of sight, or central point; as, the projection of a sphere. The several kinds of projection differ according to the assumed point of sight and plane of projection in each. [1913 Webster]

5. (Geog.) Any method of representing the surface of the earth upon a plane. [1913 Webster]

{Conical projection}, a mode of representing the sphere, the spherical surface being projected upon the surface of a cone tangent to the sphere, the point of sight being at the center of the sphere.

{Cylindric projection}, a mode of representing the sphere, the spherical surface being projected upon the surface of a cylinder touching the sphere, the point of sight being at the center of the sphere.

{Globular}, {Gnomonic}, {Orthographic}, {projection},etc. See under {Globular}, {Gnomonic}, etc.

{Mercator's projection}, a mode of representing the sphere in which the meridians are drawn parallel to each other, and the parallels of latitude are straight lines whose distance from each other increases with their distance from the equator, so that at all places the degrees of latitude and longitude have to each other the same ratio as on the sphere itself.

{Oblique projection}, a projection made by parallel lines drawn from every point of a figure and meeting the plane of projection obliquely.

{Polar projection}, a projection of the sphere in which the point of sight is at the center, and the plane of projection passes through one of the polar circles.

{Powder of projection} (Alchemy.), a certain powder cast into a crucible or other vessel containing prepared metal or other matter which is to be thereby transmuted into gold.

{Projection of a point on a plane} (Descriptive Geom.), the foot of a perpendicular to the plane drawn through the point.

{Projection of a straight line of a plane}, the straight line of the plane connecting the feet of the perpendiculars let fall from the extremities of the given line. [1913 Webster]

Syn: See {Protuberance}. [1913 Webster] [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Mercator's projection — noun a map projection of the earth onto a cylinder; areas appear greater the farther they are from the equator • Syn: ↑Mercator projection • Hypernyms: ↑map projection * * * Mercator s projection noun A representation of the surface of the globe… …   Useful english dictionary

  • Mercator's projection — /mɜˌkeɪtəz prəˈdʒɛkʃən/ (say mer.kaytuhz pruh jekshuhn) noun a map projection with rectangular grid which is conformal and on which any rhumb line is represented as a straight line. It is particularly useful for navigation, though the scale… …   Australian English dictionary

  • Mercator map projection — A conformal cylindrical map projection in which the surface of a sphere or spheroid, such as the earth, is conceived as developed on a cylinder tangent along the equator; meridians appear as equally spaced vertical lines; and parallels appear as… …   Aviation dictionary

  • transverse Mercator map projection — A conformal cylindrical map projection, which is in principle equivalent to the regular Mercator map projection turned (transversed) 90° in azimuth. In this projection, the central meridian is represented by a straight line, corresponding to the… …   Aviation dictionary

  • oblique Mercator’s projection — A type of conformal map projection in which the cylinder is tangent at a great circle other than the equator or the meridian. The line of tangency can be any great circle. The projection is used principally to depict an area near the vicinity of… …   Aviation dictionary

  • Mercator projection — of the world between 82°S and 82°N. Mercator world …   Wikipedia

  • Projection de mercator — La projection de Mercator est cylindrique …   Wikipédia en Français

  • Projection cylindrique equidistante — Projection cylindrique équidistante Demande de traduction Equirectangular projection → …   Wikipédia en Français

  • Projection équirectangulaire — Projection cylindrique équidistante Demande de traduction Equirectangular projection → …   Wikipédia en Français

  • Projection conforme — Projection cartographique Le choix d une projection et la conversion d une projection à une autre comptent parmi les difficultés que les cartographes ont dû affronter. L informatique leur a beaucoup apporté de ce point de vue La projection… …   Wikipédia en Français


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