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Gall's Stereographic

Release 9.2
Last modified August 3, 2007
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Description

Gall's Stereographic was designed around 1855. It is a cylindrical projection with two standard parallels at latitudes 45° N and S.

Illustration of Gall's Stereographic projection


Projection method

Cylindrical stereographic projection based on two standard parallels at 45° N and S. The globe is projected perspectively onto a secant cylinder from the point on the equator opposite a given meridian. Meridians are equally spaced straight lines. Parallels are straight lines with spacing increasing away from the equator. Poles are straight lines.


Lines of contact

Two lines at 45° N and S.


Linear graticules

All meridians and parallels.


Properties


Shape



Shapes are true at latitudes 45° N and S. Distortion slowly increases away from these latitudes and becomes severe at the poles.

Area



Area is true at latitudes 45° N and S. Distortion slowly increases away from these latitudes and becomes severe at the poles.

Direction



Locally correct at latitudes 45° N and S. Generally distorted elsewhere.

Distance



Scale is true in all directions along latitudes 45° N and S. Scale is constant along parallels and is symmetrical around the equator. Distances are compressed between latitudes 45° N and S and expanded beyond them.


Limitations

Used only for world maps.


Uses and applications

Used for world maps in British atlases.


Parameters


Desktop





Workstation





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