# Kavrayskiy VII projection

Kavrayskiy VII projection of the Earth
The Kavrayskiy VII projection with Tissot's indicatrix of deformation

The Kavrayskiy VII projection is a map projection invented by Soviet cartographer Vladimir V. Kavrayskiy in 1939[1] for use as a general-purpose pseudocylindrical projection. Like the Robinson projection, it is a compromise intended to produce good-quality maps with low distortion overall. It scores well in that respect compared to other popular projections, such as the Winkel tripel,[2][3] despite straight, evenly spaced parallels and a simple formulation. Regardless, it has not been widely used outside the former Soviet Union.(citation?)

The projection is defined as

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

where λ is the longitude, and φ is the latitude in radians.

## References

1. Snyder, John P. (1993). Flattening the Earth: Two Thousand Years of Map Projections. Chicago: University of Chicago Press. pp. 202. ISBN 0-226-76747-7. Retrieved 2014-11-05.
2. Goldberg, David M.; Gott III, J. Richard (2007). "Flexion and Skewness in Map Projections of the Earth". Cartographica 42 (4): 297–318. doi:10.3138/carto.42.4.297. Retrieved 2014-11-05.
3. Capek, Richard (2001). "Which is the best projection for the world map?". Proceedings of the 20th International Cartographic Conference (Beijing, China) 5: 3084–93. Retrieved 2014-11-05.