NAME

     zkk2zxy - (Step 3 of 3) 3D V(z) Phase Shift Poststack  Depth
     Migration

SYNOPSIS

     [dtms=dtout] [dz=dzout] [zmax=zmax]  [tmax=tmax]  [M=mbytes]
     [out=output] [data_path=path] [data_suffix=suffix] [flags=V]
     [-?]  [-h]

DESCRIPTION

     zkk2zxy is the third step of a three step process. Type cat-
     pat 3dvzmig > 3dvzmig.job
      for a script which will execute  all  three  steps  of  the
     migration  process.   zkk2zxy  reads the output from program
     cmmvz3d which is in (z,  kx,  ky)  coordinates  and  inverse
     fft's  and  transposes  the data into (z, x, y) coordinates.
     zkk2zxy gets the input and output filenames and other param-
     eters  from  command line arguments as described below. Both
     the input and the output datasets are USP formatted.

  Command line arguments
      > ntap
          Enter the input dataset name after typing > .

      out=outfile
          Enter the `basename' of the output dataset after typing
          out=   .   This   program   will   produce  two  files:
          `basename`.zkk2zxy which is  a  dictionary  file  which
          gives basic information about the seismic data; and
           `basename`.zkk2zxy.usp  which  is  a   USP   formatted
          seismic data in coordinates (z, x, y).

      data_path=path
          This specifies the full pathname to the directory where
          you  want  the  output  to  be  written.   There  is no
          default.

      data_suffix=suffix
          This specifies the third  part  of  the  name  for  the
          seismic  data  file  described  above.   The default is
          "usp".

      dz=dzout
          This value is in feet or meters and represents the sam-
          ple spacing increment in depth for the output.

      dtms=dtout
          This value is in milliseconds and represents the output
          sample  spacing in time.  The parameters of dtms and dz
          must not both be greater than zero.  If you desire  the
          output  in  time,  enter  a positive value for dtms and
          enter zero for dz.

      zmax=zmax
          This value is in feet or meters and represents the max-
          imum  depth.  This should be the same value as the zmax
          entered for program cmmvz3d.

      tmax=tmax
          This value is in milliseconds and represents  the  max-
          imum  time.  This  should be the same value as the tmax
          entered for program cmmvz3d.

      M=mbytes
          This value represents the number of megabytes of memory
          available  for work space. The default for Crays is 64,
          and 32 for all other architectures.

      flags=flags
          Enter flags=V for verbose printout.

     -h   Enter -h for online help. The  program  will  terminate
          after printing this.

     -?   Enter -? for online help. The  program  will  terminate
          after printing this.

SEE ALSO

     mbs, dspace, 3dvzmig, fft3d, cmmvz3d

BUGS

     None known.

AUTHOR

     N. D. Whitmore, Jr., Ron D. Coleman

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.