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Gall's Stereographic Projection

A Cylindrical Projection which projects the equator onto a tangent cylinder which intersects the globe at ± 45°. The transformation equations are

$\displaystyle x$ $\textstyle =$ $\displaystyle \lambda$  
$\displaystyle y$ $\textstyle =$ $\displaystyle \tan({\textstyle{1\over 2}}\phi),$  

where $\lambda$ is the Longitude and $\phi$ the Latitude.

See also Stereographic Projection


Dana, P. H. ``Map Projections.''

© 1996-9 Eric W. Weisstein