Directory of Map Projections

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BSAM

БСАМ

Description

Cylindric projection with Mercator-like appearance but reduced high-latitude excesses.

Classifications

cylindric
compromise

Graticule

Meridians: Straight, evenly spaced, 68.6% the length of the parallels.
Parallels: Straight, with spacing in accordance with reality at the equator and slowly increasing away from it.

Scale

Scale is correct along 30°N/S parallels.

Distortion

Free of distortion along the 30°N/S parallels. The map’s distortion is predominately in the form of areal inflation.

Origin

Same as Gall stereographic but with 30°N/S as secant parallels. It appeared in 1937 in the Great Soviet World Atlas (Bol’shoy sovetskiy atlas mira).

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