SHADED RELIEF MAP OF HYPERION

Hyperion.gif is a shaded relief map of Hyperion, a small satellite of
Saturn.  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.
This map was published in its full form with feature names, latitude-
longitude grid etc. in:

Stooke, P.J. "Topography and Geology of Hyperion", EARTH, MOON & PLANETS
   74: 61-83, 1996.

Positions in the map are controlled by a digital shape model, fully
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).  Since Hyperion rotates non-synchronously, the
prime meridian is defined arbitrarily.  The shape model is derived from
one created by Peter Thomas and colleagues of Cornell University, and
described (along with the rotation state) in:

Thomas, P.C., Black, G.J. and Nicholson, P.D., "Hyperion: Rotation,
   Shape and Geology from Voyager Images", ICARUS 117: 128-148, 1995.

For this map, the longitudes are found by subtracting 135 degrees from 
the longitudes used by Thomas et al.  This places zero longitude on the
intermediate axis of Hyperion.

As with all conformal (true shape) projections, the scale in these maps
varies, increasing from the centre to the outer edge.

The map projection is described in:

Stooke, P.J. and Keller, C.P., 1990.  "Map Projections for Non-Spherical
Worlds / the Variable-Radius Map Projections", CARTOGRAPHICA, V. 27, No.
2, pp. 82-100.

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
stooke@sscl.uwo.ca