POLAR PHOTOMOSAICS OF PHOBOS

Phobos3.jpg is a photomosaic of Phobos, the inner satellite of Mars.
The original mosaic, at much higher resolution than shown here, was
prepared by Peter Thomas, Damon Simonelli and colleagues at Cornell
University.  It was published in cylindrical and sinusoidal map
projections in:

Simonelli. D.P., Thomas, P.C., Carcich, B.T. and Veverka, J., 1993.
  "The Generation and Use of Numerical Shape Models for Irregular
   Solar System Objects", ICARUS, V. 103, pp. 49-61.

and is also discussed in:

Thomas, P.C., 1993.  "Gravity, Tides, and Topography on Small
   Satellites and Asteroids: Application to Surface Features of the
   Martian Satellites", ICARUS, V. 105, pp. 326-344, 1993.

Positions in the mosaic are controlled by a shape model described
in those papers.  The original digital mosaic and the shape model were
kindly provided by P. Thomas.  I filled a small gap in the mosaic using
a Phobos 2 image.  The mosaic was then reprojected in small sections to
fit the polar map projections.  Like all conformal azimuthal projections,
the scale increases from the centre outwards (i.e. the polar region looks
smaller than similar-sized areas near the equator, which forms the outer
edge of each half of the map).  This is a result of the distortion
necessary to keep circular craters roughly circular on the map.

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