This image is a shaded relief map of Proteus, a small inner satellite of Neptune. As with all maps, it is the cartographer's interpretation and not all features are necessarily certain given the limited data available - this interpretation stretches the data as far as is feasible. A small part of this map was published in:
Stooke, P.J., 1994. "The Surfaces of Larissa and Proteus", EARTH, MOON AND PLANETS, V. 65, pp. 31-54.Positions in the map are controlled by a digital shape model, described in that paper. For this map, the three dimensional convex hull of the shape model was projected into the Morphographic Conformal Projection (the conventional Stereographic Projection modified for non-spherical worlds). The map was compiled in that projection and reprojected to the Simple Cylindrical projection. Longitude 0 is at the center of the map and faces Neptune. As with all cylindrical projections, this map is severely distorted near the poles (top and bottom edges).
This version of the file, with labels intact, is in the public domain.
Philip Stooke, Department of Geography, University of Western Ontario, London, Ontario, Canada N6A 5C2 firstname.lastname@example.org