Conic Projection

Conic Projection
A conic projection of points on a unit sphere centered at consists of extending the line for each point until it intersects a cone with apex which tangent to the sphere along a circle passing through a point in a point .

The polyconic projection of Hassler (fig.3.18) is simultaneously universal for a given figure of the earth (sphere or ellipsoid), simply drawn, even for the ellipsoid, and employs useful scale characteristics.

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, in the normal polar aspect, have as distinctive features: ...

A Polyconic projection of the Earth.
A polyconic projection is a conical map projection. The projection stems from "rolling" a cone tangent to the Earth at all parallels of latitude, instead of a single cone in a normal conic projection.

Conic Projection: A projection in which the surface is drawn as it would appear if projected on a cone wrapped around the Earth.

Polyconic projection The Polyconic projection is neither conformal nor equal-area. The polyconic projection is projected onto cones tangent to each parallel, so the meridians are curved, not straight.

A polyconic projection is created by projecting different portions of the earth's surface onto portions of different cones each with its own standard lines. The United States Geological Survey frequently uses polyconic projections for its maps.

conic projection
A conic projection is a type of map in which a cone is wrapped around a sphere (the globe), and the details of the globe are projected onto the cylindrical surface. Then, the cylinder is unwrapped into a flat surface.
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Conic Projection - Lambert Conformal Conic
Johann Heinrich Lambert was a German/French mathematician and scientist. His mathematics was considered revolutionary for its time and is still considered important today.

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 - A class of map projection involving the projection of part of the globe onto a cone-shape surface.
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In a conic projection, a cone is placed over the earth, normally tangent to one or more lines of latitude. This tangent line is called a standard parallel and, in general, distortion increases the further away you get from this line.

The polyconic projection (from the Greek, "poly" meaning many), envelopes the globe with an infinite number of cones, each with its own standard parallel. The parallels are non-concentric, while the central meridian is straight.

i.e., in a conic projection all distances from the center are represented at the same scale
C. FIGURE OF THE EARTH ...

Albers Equal-Area Conic Projection(Albers)
With standard parallels of 29.5 and 45.5 degrees, this projection is one commonly used to depict the United States. It was used by the USGS in their 1970 National Atlas.

[map projections] A conic projection whose axis does not line up with the polar axis of the globe.
[map projections] A cylindrical projection whose lines of tangency or secancy follow neither the equator nor a meridian.

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; ...

Using Spatial Analyst this tile was clipped, warped with an order-three polynomial to approximate an Equidistant Conic projection (Clarke 1866 spheroid, central meridian 71 degrees west, reference latitude 19 degrees north, ...

If it is important that the radar coverage appear as circles on the map produced by the GIS, then a conic projection may be more appropriate.

See also: Projection, Map, Area, Parallel, Map Projection