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polyconic projection
 polyconic projectionpol·y·con·ic projection P0422400 (pŏl′ē-kŏn′ĭk)n. A conic map projection having distances between meridians along every parallel equal to those distances on a globe. The central geographic meridian is a straight line, whereas the others are curved and the parallels are arcs of circles.polyconic projection (ˌpɒlɪˈkɒnɪk) n (Physical Geography) a type of conic projection in which the parallels are not concentric and all meridians except the central one are curved lines. It is neither equal-area nor conformal, but is suitable for maps of areas or countries of great longitudinal extentpol•y•con′ic projec′tion (ˌpɒl iˈkɒn ɪk)
n. a conic map projection in which the parallels are arcs of circles that are not concentric but are equally spaced along the central straight meridian, all other meridians being curves equally spaced along the parallels. [1900–05] Thesaurus| Noun | 1. polyconic projection - a conic projection of a map having distances between meridians equal to those distances on a globeconic projection, conical projection - a map projection of the globe onto a cone with its point over one of the earth's poles |
polyconic projection
polyconic projection[¦päl·i¦kän·ik prə′jek·shən] (mapping) A conic map projection in which the surface of a sphere or spheroid, such as the earth, is conceived as developed on a series of tangent cones, which are then spread out to form a plane; a separate cone is used for each small zone. polyconic projectionA map projection that is a combination of separate conic projections drawn for each parallel or latitude. In this projection, the central meridian is a straight line and other meridians are curves concave to the central meridians. Parallels are arcs of circles concave to the pole of the hemisphere. The scale is correct along all parallels. However, it is correct only along the central meridian and expands along other meridians away from the central meridian. Areas expand and shapes become distorted away from the central meridian. A great circle is a curve convex, whereas a rhumb line is a curve concave to the pole of the hemisphere. Map sheets fit North-South but not East-West. A polyconic projection has a worldwide coverage. See international modified polyconic projection.polyconic projection
Words related to polyconic projectionnoun a conic projection of a map having distances between meridians equal to those distances on a globeRelated Words- conic projection
- conical projection
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