Help for WATERMAP

      WATERMAP is a program to compute the atmospheric moisture content image,
starting with the CIBR image and a 2 column table of moisture contents and
CIBR values.  WATERMAP finds the values of a and b that fits the table values 
to a curve of the form
                                          b
                       CIBR = exp(-a*WATER )

Then, using the inverse of this equation, it computes the water image from
the CIBR map.
       Operationally, this is done by means of a lookup table of the possible
input values.  The data type of the input image may be byte, halfword, or 
fullword, but the values must fall within the range of 1 to 32767.  The 
parameter SCALE is used to rescale the data into the units used in the fitted 
table.
       The rescaled CIBR values should all fall within the range 0 to 1.  If
a value less than 0 is encountered, it is marked in the output with a value of 
99999.0.  Input values that are greater than 1 are set to -1 in the output.