Geocart menu class: Lenticular
Neither conformal nor equal area
Meridians: Central meridian is a straight line half the length of the Equator. Other meridians are complex curves, equally spaced along the Equator and concave toward the central meridian
Parallels: Equator is straight. Other parallels are complex curves, equally spaced along the central meridian and concave toward the nearest pole.
Symmetry: About the Equator and the central meridian
True along the Equator and the central meridian
Moderate shape and area distortion
Elliptical border. An equatorial aspect of one hemisphere of the Azimuthal Equidistant projection, on which horizontal coordinates have been doubled and meridians have been given twice their original longitudes.
Design inspired H.H. Ernst von Hammer to develop his elliptical projection
David Aitoff (or Aitow) (1854–1933) in 1889
Hammer (Elliptical), equal area and mistakenly called Aitoff in the early 20th century
Briesemeister, an oblique modification of the Hammer
Eckert-Greifendorff, a modification of the Lambert Azimuthal Equal-Area projection inspired by the Hammer
Winkel Tripel is a combination of the Aitoff and Equidistant Cylindrical projections.
Description adapted from J.P. Snyder and P.M. Voxland, An Album of Map Projections, U.S. Geological Survey Professional Paper 1453. United States Government Printing Office: 1989.