What is Polyconic Projection?

Information about Polyconic Projection

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. Each parallel is a circular arc of true scale. The scale is also true on the central meridian of the projection. The projection was in common use by many map-making agencies of the United States from its proposal by Ferdinand Rudolph Hassler in 1825 until the middle of the 20th century.^[1]

The projection is defined by:

$\text{[math]}$

where $\text{[math]}$ is the longitude from the central meridian, and $\text{[math]}$ is the latitude. To avoid division by zero, the formulas above are extended so that if $\text{[math]}$ then $\text{[math]}$ and $\text{[math]}$ .

References

1. ^ Flattening the Earth: Two Thousand Years of Map Projections, John P. Snyder, 1993, pp. 117-122, ISBN 0-226-76747-7.

External links

Views
Graphical projections

Perspective projection
Parallel projection
Orthographic projection
Plan, or floor plan view
Section

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Ferdinand Rudolph Hassler (1770–1843) was born in Aarau, Switzerland. He was employed on the trigonometrical survey of Switzerland before he emigrated to the United States in 1805. He was acting professor of mathematics at West Point from 1807 to 1810.
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18th century - 19th century - 20th century
1790s 1800s 1810s - 1820s - 1830s 1840s 1850s
1822 1823 1824 - 1825 - 1826 1827 1828

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Subjects: Archaeology - Architecture -
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