polyconic projection

2 definitions found

polyconic projection - Collaborative International Dictionary of English v.0.48 :

  Polyconic \Pol`y*con"ic\, a. [Poly- + conic.]
     Pertaining to, or based upon, many cones.
     [1913 Webster]
  
     Polyconic projection (Map Making), a projection of the
        earth's surface, or any portion thereof, by which each
        narrow zone is projected upon a conical surface that
        touches the sphere along this zone, the conical surface
        being then unrolled. This projection differs from conic
        projection in that latter assumes but one cone for the
        whole map. Polyconic projection is that in use in the
        United States coast and geodetic survey.
        [1913 Webster]

polyconic projection - WordNet (r) 2.1 (2005) :

  polyconic projection
      n 1: a conic projection of a map having distances between
           meridians equal to those distances on a globe