NAME

     prepmod - is a preparation for prestack  modelization  algo-
     rithm kmod.

SYNOPSIS

     prepmod [ -Ofile_geometry ] [ -Tfile_topo ] [ -Wfile_water ]
     [  -dstadsta ] [ -ftraftra ] [ -ntracentrace ] [ -dshotdshot
     ] [  -fshotfshot  ]  [  -nshotnshot  ]  [  -nsampnsamp  ]  [
     -dtmsecdtmsec ] [ -zdatumzdatum ] [ -zvozvo ] [ -dzdz ] [ -?
     ]

DESCRIPTION

     prepmod is designed  to  read  first  shot  location,  first
     receiver  location,  shot increment, station increment, shot
     number, receiver number, number of time samples,  time  sam-
     pling  rate, elevations/topography and other geometry values
     and write them out as a flat  file,  thereby  divorcing  the
     Kirchhoff  ray trace modelization program kray and the pres-
     tack Kirchhoff modelization program, kmod, from AMOCO's ever
     evolving header formats.

     In addition, the geometry information is processed  to  pro-
     vide  information  such  as   maximum and minimum extents of
     live traces in the data, leftmost and rightmost  live  trace
     distances  from each shot, and so on, to allow programs kray
     and sammig to have efficient dynamic  memory  allocation  as
     well  as to allow for easier implementation on parallel pro-
     cessors.

     prepmod gets both its data and its parameters  from  command
     line arguments.  These arguments specify the input, outputs,
     and certain floating point values to  override  the  current
     restrictions to trace header integer values.

  Command line arguments
     No bugs known at present.  This  program  will  need  to  be
     rewritten each time we change header formats.

SEE ALSO

      vsm, vsamp, kray, kmod, xmig, maip

CONTRACT AGREEMENT

     Maintenance of this software is provided by the  2-D  Migra-
     tion  Before  Stack  Core Product Line, D96-2719.  Thank you
     for your support.

AUTHOR

     B. Duquet (Amoco EPTG, 1996).

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved

          an affiliate of BP America Inc.