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

* 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) <<BR>>
  byte 3 relative "albedo" (1-199) (byte)

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

=== Example of a MAPFILE Header ===

{{{
 # Qsize           49
 # Scale    9.9999997473787516E-006
 # Vector   -2.6262991130352020E-002  0.26271706819534302       -3.1600955873727798E-002
 # Ux    6.2937657348811626E-003 -0.13774713873863220      -0.99044746160507202     
 # Uy  -0.99829435348510742       -5.8354031294584274E-002   1.7719966126605868E-003
 # Uz   -5.8040685951709747E-002  0.98874694108963013      -0.13787946105003357 
}}}