Help for RPCSLANT

PURPOSE

Also allows rotation.  A shift can also be performed.  The shift is in degrees just
like lon-lat.  It is applied after the slant perspective and the rotation.

The program also allows error values to be added to the perspective, rotation or
shift (useful for modeling of data sets containing error).  The created rpc will
model the non-error inputs but the image will be moved by the sum of the non-error
inputs and the error inputs.  The full parameter set then looks like:

       ang_e        dang_e
       ang_n        dang_n
       rot          drot
       shift_e      dshift_e
       shift_n      dshift_n

The user must choose between parameters out1 and dout1.  If out1 is chosen then the "d" parameters
must all be zero.  If dout1 is chosen then the errors will be in the image but not in the rpc so that a gtwarp of the image will not restore to the original but will still contain the errors.

The rpc that is supposed to match the slanted perspective is not quite right.
I think that this is an inverse problem... the pixel that has been moved 
according to a (phi,lambda,height) is being moved back with a slightly different (phi,lambda,height) in the inverse rpc.
     
     
CALL

      
  
OPERATION


PERFORMANCE



Restrictions
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Original Programmer: A. L. Zobrist, 29 May, 2013
Current Cognizant Programmer: A. L. Zobrist

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