The Wiechel projection is an

azimuthal An azimuth (; from ar, اَلسُّمُوت, as-sumūt, the directions) is an angular measurement in a spherical coordinate system. More specifically, it is the horizontal angle from a cardinal direction, most commonly north. Mathematically, ...

, equal-area

map projection In cartography, map projection is the term used to describe a broad set of transformations employed to represent the two-dimensional curved surface of a globe on a plane. In a map projection, coordinates, often expressed as latitude and longit ...

, and a novelty map presented by William H. Wiechel in 1879. It is also a modified azimuthal projection. Distortion of direction, shape, and distance is considerable in the edges. In polar aspect, the Wiechel projection can be expressed as so: :

\beginx &= R \left( \sin \lambda \cos \phi - \left( 1 - \sin \phi \right) \cos \lambda \right), \\
y &= -R \left( \cos \lambda \cos \phi + \left( 1 - \sin \phi \right) \sin \lambda \right).
\end

References

Map projections Equal-area projections {{Cartography-stub

See also

References