Directory of Map Projections

What is a projection?

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Breusing harmonic

Parameters: Radius of minimum error 0 ≤ R < 180°


Developed as the harmonic mean between the stereographic and the Lambert azimuthal equal-area projections in order to balance the errors between conformal and equal-area presentations.




Meridians: Straight lines radiating from centered pole.
Parallels: Circles spaced as a harmonic progression, closer together than is natural at the center and steadily increasing outward.
Poles: Center pole is a point; opposite pole is a circle.


From the center pole to a ring at about 25°N, the projection is slightly inflated in area, with low angular deformation. From ~25°N to ~25°S, distortion shifts toward angular deformation, and beyond that, distortion is balanced but increases rapidly.

Similar projections

Azimuthal equidistant has constant parallel spacing but yields a similar map.


By Alfred Ernest Young, 1920, who named it for Arthur Breusing due to the similar technique.

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