Un planisphère de la planète Mars en projection équiaréale - article ; n°481 ; vol.87, pg 314-319
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Annales de Géographie - Année 1978 - Volume 87 - Numéro 481 - Pages 314-319Previously, 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.
6 pages
Source : Persée ; Ministère de la jeunesse, de l’éducation nationale et de la recherche, Direction de l’enseignement supérieur, Sous-direction des bibliothèques et de la documentation.
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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.
6 pages
Source : Persée ; Ministère de la jeunesse, de l’éducation nationale et de la recherche, Direction de l’enseignement supérieur, Sous-direction des bibliothèques et de la documentation.
André Cailleux
Un planisphère de la planète Mars en projection équiaréale
In: Annales de Géographie. 1978, t. 87, n°481. pp. 314-319.
Abstract
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.
Citer ce document / Cite this document :
Cailleux André. Un planisphère de la planète Mars en projection équiaréale. In: Annales de Géographie. 1978, t. 87, n°481. pp.
314-319.
doi : 10.3406/geo.1978.17876
http://www.persee.fr/web/revues/home/prescript/article/geo_0003-4010_1978_num_87_481_17876
