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Figure 9.4 Map of the world in a Mollweide projection with Tissot's Indicatrix of defor-
mation. Each red circle/ellipse has a radius of 500 kilometers. Scale 1:5,000,000.
Source of original image: Eric Gaba, June 2008. Data: US NGDC World Coast Line
MollweideProjection.html
).
Figure 9.5 Map of the world in a Sinusoidal projection with Tissot's Indicatrix of defor-
mation. Each red circle/ellipse has a radius of 500 kilometers. Scale 1:5,000,000.
Source of original image: Eric Gaba, June 2008. Data: US NGDC World Coast Line
SinusoidalProjection.html
).
the edges of the projection, these observations are perhaps the most evident.
Tissot indicatrices may be found for any map; the
WayBackMachine
shows
them for a variety of projections (2005).
Figure 9.3
illustrates quite clearly the way in which landmasses become
exaggerated in area as one moves toward the po
les. Figures 9.4
and 9.5
illustrate a change in shape, rather than in area, as one moves poleward.
While the visual evidence is compelling, it is difficult to see simultaneously
in the mind's eye how the graticule distortion might distort a variety of globe
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