NAME

     prepr3d  - module to prepare 1GRUP, 1SORC  and  1SPRD  cards
     required  by  pr3d  from input SEGP1 UKOOA format navigation
     data.

SYNOPSIS

     prepr3d [ -Nntap ] [ -Ootap ] [ -sist ] [ -eiend ] [ -vvel ]
     [  -nsnstr ] [ -nenetr ] [ -rsnrst ] [ -renred ] [ -V ] [ -?
     ]

DESCRIPTION

     prepr3d read in navigation (station survey)  data  in  SEGP1
     (UKOOA)  format.   Combined  with  information passed to the
     routine on the command line the information is used to  con-
     struct  all  1GRUP,  1SORC and 1SPRD cards required by pr3d.
     The routine may be run in -stats mode in which case no  out-
     put  cards  are created, only statistics from the survey are
     output to the prepr3d printout file.

     prepr3d  gets both its data and its parameters from  command
     line  arguments.   These arguments specify the input naviga-
     tion data, input source skips data, output card image  file,
     the  number  of stations to rollin before rolling along, the
     station number of the first shot, the station number of  the
     first  trace,  the  regional  reference surface, the initial
     record number, the stats flag, the metric/english conversion
     flags,  the  reverse  sort  flag  and  verbose  printout, if
     desired.

  Command line arguments
     -N ntap
          Enter the  input  navigation  data  set  name  or  file
          immediately  after  typing  -N.   Make certain that all
          comments have been removed from the  begining  of  this
          file.   The  first line of the file should be the first
          station  co-ordinate  line.  This  input  file   should
          include the complete path name if the file resides in a
          different directory.  Example -N/b/vsp/dummy tells  the
          program to look for file 'dummy' in directory '/b/vsp'.


     -S skips
          Enter the source skips flat file name immediately after
          typing  -S.   This  file  should  contain a list of all
          shots skipped on the dataset of interest in one  source
          point per line format.

     -O otap
          Enter the output card  image  data  set  name  or  file
          immediately  after typing -O.  The output data set also
          requires the full path name (see above) and  will  con-
          tain  all 1GRUP, 1SORC and !SPRD cards generated by the
          program.

     -rollin iroll
          Enter the number of stations to  progress  through  the
          navigation file before a full spread is recorded.

     -ss ss
          Enter the station location corresponding to  the  first
          source point in the navigation (survey) file.

     -st st
          Enter the station location corresponding to  the  first
          trace  in the record recorded at the above first source
          point.  If this is a fake source point you will need to
          put in the station corresponding to the fake trace 1.

     -rec irec
          Enter the record number that you would like  associated
          with the first record on your input dataset.

     -rref rref
          Enter the regional reference surface elevation  (ft  or
          m) for the line.

     -stats
          Enter the command line argument '-stats' to get  survey
          statistics only in the printout file.  No cards will be
          generated.  This is usefull to determine the survey x,y
          limits  needed  for the corner co-ordinates required by
          pr3d.

     -metric
          Enter the command line argument  '-metric'  to  convert
          input co-ordinates to meters from feet.

     -english
          Enter the command line argument '-english'  to  convert
          input co-ordinates to feet from meters.

     -R   Enter the command line argument '-R' to cause the 1SORC
          cards  to  be  created in the inverse sorted order from
          the data in the navigation file.

     -V   Enter the command line argument '-V' to get  additional
          printout.

     -?   Enter the command line  argument  '-?'  to  get  online
          help.   The program terminates after the help screen is
          printed.

BUGS

     Let me know.

SEE ALSO

     pr3d(1)

AUTHOR

     P. G. A. Garossino APR:3932 zpgg07@trc.amoco.com  [requested
     by Mike Mueller, USA]

COPYRIGHT

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