Geocart Projections

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shield

Parameters: Standard parallel

Description

Shield is a fusion of Albers conic and Bonne projections at the equator, with another standard parallel able to be designated.

Classifications

Pseudoconic
Equal-area

Graticule

Meridians: Partly straight, partly complex curves
Parallels: Circule arcs
Poles: When “Standard parallel” is positive, the north pole is a circular arc and the south pole is a point. When “Standard parallel” is negative, the south pole is a complex curve and the
Symmetry: Symmetric east-west.

Parameters

Standard parallel: The latitude of fusion between Albers and Bonne.

Limiting forms

Werner, when Standard parallel = 90°. Lambert azimuthal equal-area when Standard parallel = –90°.

Origin

Developed by Daniel “daan” Strebe (1962–) in 1992.

Similar projections

Amulet is also a fusion of Albers and Bonne, with the joint along a designated parallel. Its joint is a smooth transition.

Description ©2017 Mapthematics LLC.