Bonne

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The Bonne projection is an equal-area projection. True scale is achievable along the central meridian and all parallels. Although it was used in the 1800s and early 1900s, Bonne was replaced by Lambert Azimuthal Equal Area by the mapping company Rand McNally & Co. and Hammond, Inc. See Lambert Azimuthal Equal Area.

Construction

Pseudocone

Property

Equal-area

Meridians

N/A

Parallels

Parallels are concentric arcs that are equally spaced.

Graticule spacing

Central meridian is a linear graticule.

Linear scale

Scale is true along the central meridian and all parallels.

Uses

Maps of continents and small areas. There is some distortion.

Source: Environmental Systems Research Institute, 1997

Bonne Projection

map_projection_bonne

Source: Snyder and Voxland, 1989