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Un planisphère de la planéte Mars en projection équiaréale
Annales de Géographie
87e Année, No. 481 (Mai-Juin 1978), pp. 314-319
Published by: Armand Colin
Stable URL: http://www.jstor.org/stable/23450697
Page Count: 6
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Previously, most maps of the Moon and the planets were made in a perspective, so-called orthographic projection. They are neither equal-area nor conformal. Fortunately enough we are able to make other kinds of maps. For the Moon and the planets, most of them are conformal. But for some purposes equal-area maps are necessary. And as everyone knows, no projection can be both conformal and equal-area. The map of Mars published by U.S.G.S. (United States Geological Survey) is a wonderful document, in conformal projection. On the base of this document, I prepared a planisphere of Mars in the equal-area Mollweide projection (Fig. 1). Now, I think that the equal-area Hammer-Aïtoff planisphere might be even better because the polar and equatorial regions are less deformed, and the curved parallels better suggest to the eye the spherical form of the planet.
Annales de Géographie © 1978 Armand Colin