shadco Documentation

shadco -  Add shaded relief to color cube
SHADCO will combine a shaded relief file with a color cube algebraically
so that there will be no shift in hue (color) when the intensity or
brightness is altered by the shaded relief.

Programmer:  Kay Edwards, Q & D for Mark S. Robinson at
Northwestern University

Input color cube file name
  (default extension is .cub)

"color.cub"

Shaded relief cube file name
  (default extension is .cub)

"shade.cub"

Output color cube file name
  (default extension is .cub)

"newcolor.cub"

DN range of color cube

0.,100.

DN range of shaded relief

-.5,1.166

ADDITIONAL NOTES:

Parm	Description
FROM	Input color cube file name. If the file extension is omitted, then ".cub" will be assumed. This cube must contain three bands in the following order: red, green, blue
FROM2	Shaded relief input cube file name. If the file extension is omitted, then ".cub" will be assumed.
TO	Output color file with the added shaded relief. If the file extension is omitted, then ".cub" will be assumed.
CRANGE	DN range of input color cube. If CRANGE does not include all the range of the color cube, a warning will be issued at the end of the program and there WILL be a shift in color (hue) in the output cube.
SRANGE	DN range of shaded relief cube. The center of SRANGE must be at the mean of the shaded relief to maintain the same intensity (brightness) of the color cube in the flat areas of the cube. SRANGE may contain less range than the shaded relief cube. This will increase the contrast of the shaded relief when added to the color, but will still not shift the color (hue) of the output cube. If the shaded relief cube is an output of the "shade" program the following table shows the DN of flat areas for different sun angles: sun angle mean DN (flat) 0. 0. 15. .206 30. .333 45. .414 60. .464 75. .491 As of July 1999 the algorithm in "shade" will find the brightness (DN) for the flat areas using the following equation: DN= sin(sun angle)/(sin(sun angle) + 1.)