CYLINDRICAL PROJECTION MAP OF PROMETHEUS

Prometh2.gif is a shaded relief map of Prometheus, the inner F Ring
Shepherd satellite of Saturn.  It is the same map as Promethe.gif, but
reprojected to the Simple Cylindrical projection.  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.  The original map was published in its 
full form with latitude-longitude grid, in:

Stooke, P.J., 1993.  "The Shapes and Surface Features of Prometheus and
   Pandora", EARTH, MOON AND PLANETS, V. 62, pp. 199-221.

Positions in the map are controlled by a digital shape model, described
in that paper.  For that 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).  That relief drawing was scanned and reprojected to this
cylindrical projection.  If nothing else, the new projection reveals
the inadequacy of the cylindrical projection for portraying very
elongated objects.  Longitude 0, which faces Saturn, runs down the centre
of the map.

The lighting in the original shaded relief drawing was not consistently
from the left (west), to give uniform lighting along ridges and valleys
near the North Pole of Prometheus.  For this representation the portrayal
in a few areas has been altered to ensure that lighting is uniformly from
the west.

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