Snyder minimum-error flat-pole

Classifications

pseudocylindric
equal-area
minimum-error

Graticule

Meridians: Central meridian is a straight line 55% as long as the equator. Other meridians are equally spaced complex curves concave toward the central meridian.
Parallels: Unequally spaced straight parallel lines. Perpendicular to the central meridian.
Poles: Lines 65% the length of the equator.
Symmetry: About the central meridian or the equator.

Scale

True along latitudes 46°15´N/S. Constant along any given latitude; same for the latitude of opposite sign.

Distortion

Free of distortion only at latitudes 46°15´N/S at the central meridian. The projection was developed as a minimum-error solution given symmetry, lines for poles in a pseudocylindric projection, and discounting the importance of the polar regions.

Similar projections

The sinucyli is very close across most of the map when weight of sinusoidal = 0.37, weighted axis = Horizontal, φ₁ = 46°15´, and vertical stretch of sinusoidal = 1.0.

Origin

Presented by John P. Snyder in 1985 as part of a broader study in using computers and numerical algorithms to create optimized map projections.

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