= MAPFILES =
===== (Compiled by TC) =====

== Description ==
MAPFILES is the directory that contains all of the maplets and bigmaps that have been created. Mapfiles contain a short header (below) that outlines basic information about the maplet (half-size, scale, central vector, coordinate frame) as well as the height and albedo values for each maplet pixel.
<<BR>>

The mapfile is made up of 72 byte records.  The first record contains
information describing the size, scale, orientation and position of the
map:

  bytes 1-6   Unused
  bytes 7-10  Scale in km/pixel (real*4 msb)
  bytes 11-12 qsz where map is 2*qsz+1 x 2*qsz+1 pixels (unsigned short lsb)
  bytes 16-27 map center body fixed position vector in km 3 x (real*4 msb)
  bytes 28-39 Ux body fixed unit map axis vector 3 x (real*4 msb)
  bytes 40-51 Uy body fixed unit map axis vector 3 x (real*4 msb)
bytes 52-63 Uz body fixed unit map normal vector 3 x (real*4 msb)
bytes 64-67 Hscale = maximum abs(height)/30000 (real*4 msb)*
byte 13255* X position uncertainty unit vector component (byte) +
byte 14255* Y position uncertainty unit vector component (byte) +
byte 15255* Z position uncertainty unit vector component (byte) +
bytes 68-71 magnitude of position uncertainty (real*4 msb) +
byte 72     Unused

* heights are in units of map scale
+ these are pretty much unused as far as I can see.

The remaining records are made up of 3 byte chunks:

bytes 1-2   height/hscale (integer*2 msb)
byte 3 relative "albedo" (1-199) (byte)

If there is missing data at any point, both height and albedo
are set to zero.