Method of Projection - Pseudocylindrical:
Meridians are equally spaced and resemble elliptical arcs, concave toward the central meridian. The central meridian is a straight line 0.51 times the length of the Equator. Parallels are equally-spaced straight lines between 380 N and S; spacing decreases beyond these limits. The poles are 0.53 times the length of the Equator. The projection is based upon tabular coordinates instead of mathematical formulas.
Linear Graticules:
All parallels and the central meridian.
Properties:
Shape: Distortion is very low within 450 of the origin and along the Equator.
Area: Distortion is very low within 450 of the origin and along the Equator.
Direction: Generally distorted.
Distance: Scale is made true along latitudes 380 N and S and is constant along any given latitude, and for the latitude of opposite sign.
Limitations:
Neither conformal nor equal area. Useful only for world maps.
Uses and Applications:
Developed for use in general and thematic world maps.
Used by Rand McNally since the 1960s and by the National Geographic Society since 1988 for general and thematic world maps.
