polyconicadj.n.

Brit.

/ˌpɒlɪˈkɒnɪk/, U.S.

/ˌpɑliˈkɑnɪk/

Origin: Formed within English, by compounding. Etymons: poly- comb. form, conic adj.

Etymology: < poly- comb. form + conic adj. Compare biconic adj. at bi- comb. form 1b.

Chiefly Cartography.

A. adj.

Involving or based upon a number of cones; spec. designating a system of map projection in which each parallel of latitude is represented by developing a cone tangent to the earth's surface along that parallel.

ΘΚΠ

the world > the earth > earth sciences > geography > map-making > map > [adjective] > types of projection

Mercatorial1734

homalographic1855

polyconic1857

isographic1872

orthomorphic1879

1857 Explor. & Surv. (U.S. War Dept.) 6 11 Two maps, constructed upon the polyconic projection, have been made to accompany this report.

1901 C. F. Close Map Projections 32 Rectangular polyconic projection, sometimes called the rectangular tangential.

1948 S. H. Spurr Aerial Photographs in Forestry viii. 94 Figure 33–B shows the distortion at the outer meridians of each conic section due to the varying radii of the circles in the polyconic development.

2000 J. N. Wilford Mapmakers (2002) vi. 100 The polyconic projection is still used for coastal surveys and for some of the Geological Survey's familiar topographic quadrangle maps.

B. n.

A polyconic projection.

ΚΠ

1879 Encycl. Brit. X. 210/1 Along the equator towards 30° or 40° longitude, the polyconic is certainly inferior, while along the meridian it is better than the perspective.

1921 Geogr. Jrnl. 57 460 The errors of all polyconics increase with the square of the longitude from the central meridian.

1977 Q. Appl. Math. 35 239 (title) Polyconics 1. Polyellipses and optimization.

2002 Cartogr. & Geogr. Information Sci. (Nexis) 1 Jan. 37 If one were to apply Lee's definitions, the Tripel [projection] can also be classified as a polyconic.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	polyconic
释义	polyconicadj.n. Brit. /ˌpɒlɪˈkɒnɪk/, U.S. /ˌpɑliˈkɑnɪk/ Origin: Formed within English, by compounding. Etymons: poly- comb. form, conic adj. Etymology: < poly- comb. form + conic adj. Compare biconic adj. at bi- comb. form 1b. Chiefly Cartography. A. adj. Involving or based upon a number of cones; spec. designating a system of map projection in which each parallel of latitude is represented by developing a cone tangent to the earth's surface along that parallel. ΘΚΠ the world > the earth > earth sciences > geography > map-making > map > [adjective] > types of projection Mercatorial1734 homalographic1855 polyconic1857 isographic1872 orthomorphic1879 1857 Explor. & Surv. (U.S. War Dept.) 6 11 Two maps, constructed upon the polyconic projection, have been made to accompany this report. 1901 C. F. Close Map Projections 32 Rectangular polyconic projection, sometimes called the rectangular tangential. 1948 S. H. Spurr Aerial Photographs in Forestry viii. 94 Figure 33–B shows the distortion at the outer meridians of each conic section due to the varying radii of the circles in the polyconic development. 2000 J. N. Wilford Mapmakers (2002) vi. 100 The polyconic projection is still used for coastal surveys and for some of the Geological Survey's familiar topographic quadrangle maps. B. n. A polyconic projection. ΚΠ 1879 Encycl. Brit. X. 210/1 Along the equator towards 30° or 40° longitude, the polyconic is certainly inferior, while along the meridian it is better than the perspective. 1921 Geogr. Jrnl. 57 460 The errors of all polyconics increase with the square of the longitude from the central meridian. 1977 Q. Appl. Math. 35 239 (title) Polyconics 1. Polyellipses and optimization. 2002 Cartogr. & Geogr. Information Sci. (Nexis) 1 Jan. 37 If one were to apply Lee's definitions, the Tripel [projection] can also be classified as a polyconic. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < adj.n.1857
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