Pseudoconic Projections
In the normal aspect for the artificial group of projections known as pseudoconic, all parallels are circular arcs with a common central point; however, meridians are not constrained to be straight lines, ...
Conic Projections
The Nomenclature and Classification of Map Projections Empire Survey Review No. 51, Vol VII January 1944 Pages 190-200 ; L.P. Lee, Lands Survey Department, Wellington, N.Z.
Matching the Map Projection to the Need ...
Conic projections result from projecting a spherical surface onto a cone.
When the cone is tangent to the sphere contact is along a small circle.
Projection of a Sphere onto a Cone (Tangent Case) ...
Conic projections are used frequently for mapping large areas (e.g., states, large countries, or continents).
Cylindrical
Different cylindrical projection orientations: ...
Conic projections are usually used for regional/national maps of mid-latitude areas - such as Australia and the United States of America.
These projections: ...
Conic projections - A class of map projection involving the projection of part of the globe onto a cone-shape surface.
...
4.6.2 Conic projections
Three well-known conical projections are the Lambert Conformal Conic projection, the Albers equal-area projection and the Polyconic projection.
References: Conic projections (Strahler and Strahler 1987 p. 14, Maling 1973, p. 164)
Alber's conical equal area projection with two standard parallels
Lambert conformal conic projection with two standard parallels ...
Conic and polyconic projections
A conic projection is obtained by projecting the earth onto a cone. The cone is then slit open and laid out flat to produce the map.
In the normal aspect (which is oblique for conic projections), parallels are projected as concentric arcs of circles, and meridians are projected as straight lines radiating at uniform angular intervals from the apex of the flattened cone.
For example, normal cylindrical projections are good for maps which are of greater extent east-west than north-south and in equatorial regions, while conic projections are better in mid-latitudes; ...
Mathworld's page on polyconic projections
Table of examples and properties of all common projections, from radicalcartography.net
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The SPCS is based on Transverse Mercator or Lambert Conformal conic projections with units in feet. States that elongate north to south normally use the Lambert Conformal. Those that are elongated east to west normally use the Transverse Mercator.
Birdseye, C. H. Formulas and Tables for the Construction of Polyconic Projections. U. S. Geological Survey, Bulletin 809, 1929.
Hunt. Appendix 39 in Report for the U.S. Coast and Geodetic Survey. 1853.
 See also: Projection, Map, Map Projection, Area, Class
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