Help for RPCCCTR

PURPOSE
    
Uses an output from Program sc2rpc to generate corner points and
put them into a vicar label prior to calling program vicar2ntf to 
make the nitf format.  Or the corners can be seen in the vicar
label.

A GEOTiff label in geographic coordinates is also added to the
label for possible use by sc2rpc.  (It is usually approximate).

   
CALL

  rpccctr cube=xxxscale image=xxximg &vr0 &vr2 &ur0 &ur2
  
  the cube corners of the call to sc2rpc have to be passed in the
  parameters (&vr0,&vr2,&ur0,&ur2)
  
OPERATION

reads the corners of the cube and uses label-add to put them into
the file label.

PERFORMANCE

about 2 seconds on a SUN blade 2000.

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

using sea level for now, need to improve for elevation.



Original Programmer: A. L. Zobrist, 25 Nov, 2005
Current Cognizant Programmer: A. L. Zobrist
Last change by: A. L. Zobrist, 25 Nov, 2005

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