Polyconic

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Pertaining to, or based upon, many cones. Polyconic projection(Map Making), a projection of the earth's surface, or any portionthereof, by which each narrow zone is projected upon a conicalsurface that touches the sphere along this zone, the conical surfacebeing then unrolled. This projection differs from conic projection inthat latter assumes but one cone for the whole map. Polyconicprojection is that in use in the United States coast and geodeticsurvey.