NAME

     qc    - build a qc-type display using input GI data.

SYNOPSIS

     qc [ -Nntap ] [ -Ootap ] [ -sist ] [ -eiend ] [  -pvel  ]  [
     -biblank ] [ -V ] [ -? ]

DESCRIPTION

     qc takes input GI data, windows each  record  in  time,  and
     arranges  these  windowed  records  to  show  shot data in a
     surface-consistent fashion.  Common  shots  will  appear  as
     horizontal  swaths  with each trace representing a common GI
     or receiver station.  The window obviously should be a frac-
     tion  (<  1/2)  of  the  input  trace length, and the window
     length (in samples) times the (number of  traces  per  group
     gather +1) may not exceed 8192 samples.

     Preprocessing should include sorting to common  groups  fol-
     lowed by applying a reduced travel-time (see program vred).

          presort -Nindata -Otable

          sisort -Nindata -ntable -G | vred -vred10000 |

          qc -Oodata -s100 -e200

     where indata might be shot data, tabel is  the  sort  table,
     and a linear velocity moveout has been applied to the data.

     It is assumed that to take in the events of interest  within
     the  input record the appropriate vred or anmo has been run.
     The qc records can be separated from one another in time  by
     a user specified pad.

     qc gets both its data and its parameters from  command  line
     arguments.  These  arguments  specify the input, output, the
     design window, and verbose printout, if desired.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing -N unless the input is from a pipe in which case
          the -N entry must be omitted.

     -O otap
          Enter the output data  set  name  or  file  immediately
          after typing -O.  This output file is not required when
          piping the output to another process.  The output  data
          set also requires the full path name (see above).

     -s ist
          Enter the start time (ms) of the  design  window.   The
          default is the beginning of the trace.

     -e iend
          Enter the end time (ms) of the design window.  There is
          no default.

     -p pad
          Enter the time in ms to separate in time the qc records
          (on  each  output) record.  This time is in addition to
          that specified by  the  window  start  and  end  times.
          Default = 0ms

     -b iblank
          Enter the  number  of  swaths  to  create  white  space
          between shot records.  Default = 1.

     -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

     unknown

SEE ALSO

     vred, anmo, bdnmo

AUTHOR

     Don Wagner (from original by P. R. Gutowski)

COPYRIGHT

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