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Bipolar Oblique Conic Conformal

Name Bipolar Oblique Conic Conformal
Model Conic
Type Conformal
Meridians Complex curves concave toward the center of the projection
Parallels Complex curves concave toward the nearest pole
Spacing Meridian Spacing increases away from the lines of true scale

Retains conformity property

Spacing Parallels Spacing increases away from the lines of true scale

Retains conformity property

Linear Scale True along two lines that do not lie along any meridian or parallel.

Scale is compressed between these lines

Expanded beyond the two lines

Good linear scale except for edges (up to 10%)

Specialties Based on two cones with apexes 104 degrees apart
Uses North and South America together on the same map

“Basement” maps

Example