Where is the projection surface tangent to (touching) the globe? (See end flap of this lab manual.)

Figure 4.5a shows Earth on a planar projection, in which the globe is projected onto a plane. This is a gnomonic projection and is generated by projecting a light source at the center of a globe onto a plane that is tangent to (touching) the globe’s surface. The resulting increasingly severe distortion as distance increases from the standard point prevents showing a full hemisphere on one projection.





Figure 4.5 (a) Gnomonic/planar projection


Tangent at North Pole (at a point, not along a line)

Environmental & Atmospheric Sciences

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