Help for RPCFIX21

PURPOSE
     The RPC coefficients are arranged into a numerator and a denominator
so they can all be divided by coefficient 21 so that coefficient 21 is fixed
at 1.0000000000.  Coefficient 21 is the constant in the denominator.

Coefficient 61 is also normalized for coefficients 41 through 80 (the RPC's
for the sample direction.

CALL
     rpcfix21 INP COL=C1
  WHERE:
     INP            is the input data set (IBIS formatted RPC's).
     COL            is the column containing the RPC's.

OPERATION

   The value in row 21 is retrieved and the RPC's 1-40 are divided
by that value.  Similarly the value in row 61 is applied to RPC's 41-80.

PERFORMANCE

Less than a second.

Restrictions
------------

None.

Original Programmer: A. L. Zobrist, 12 Apr, 2005
Current Cognizant Programmer: A. L. Zobrist 

REVISIONS
2022-08-10 B. Crocco afids to opensource (untested)

PARAMETERS: