Wagner VI projection

Wagner VI projection of the world

Wagner VI is a pseudocylindrical whole Earth map projection. Like the Robinson projection, it is a compromise projection, not having any special attributes other than a pleasing, low distortion appearance. Wagner VI is equivalent to the Kavrayskiy VII horizontally elongated by a factor of $2$⁄${\sqrt {3}}$. This elongation results in proper preservation of shapes near the equator but slightly more distortion overall. The aspect ratio of this projection is 2:1, as formed by the ratio of the equator to the central meridian. This matches the ratio of Earth’s equator to any meridian.

The Wagner VI is defined by:

$${\begin{aligned}x&=\lambda {\sqrt {1-3\left({\frac {\varphi }{\pi }}\right)^{2}}}\\y&=\varphi \end{aligned}}$$

where $\lambda$ is the longitude and $\varphi$ is the latitude.

Inverse formula:

$${\begin{aligned}\psi &=\arcsin \left({\frac {\sqrt {3}}{\pi }}y\right)\\\lambda &={\frac {x}{\cos {\psi }}}\\\varphi &=y\end{aligned}}$$

See also

• List of map projections
• Cartography
• Kavrayskiy VII projection
• Robinson projection