NAME

     stackc - module to stack data (elastic processing)

SYNOPSIS

     stackc [ -Nntap ] [ -Ootap ] [ -d2negd2neg ] [ -d1negd1neg ]
     [ -d2posd2pos ] [ -d1posd1pos ] [ -nsns ] [ -nene ] [ -rsirs
     ] [ -reire ] [ -trntpr ] [ -gathigath ] [ -pwiexp ] [ -S ] [
     -V ] [ -? ]

DESCRIPTION

     stackc will sum all selected traces within a selected record
     to  make  a  single summed trace for each component for that
     record.  Aside from treating the components separately  this
     program is very similar to stack

     stackc will continue through all selected records  and  will
     produce  an  output  file containing the composited gathers.
     Options are available to output the  stacked  data  in  user
     specified traces per record groups and to normalize the data
     according to the number of live traces.  In addition one can
     override  the input number of traces/gather.  After stacking
     the data can be piped to other programs for further process-
     ing,  e.g.  umerg  can be used to split out the stacked com-
     ponents to form their own unique data sets.

  Command line arguments
     -N ntap
          Enter the full path name of  the  file  containing  the
          data set.  If not specified, input is expected to be on
          standard input. The program will give an error  message
          if  the input file is read protected.  If no input file
          is given, and there is no standard input,  the  program
          will hang.  (default is standard input )

     -O otap
          Enter the full path name for the output  file.  If  not
          specified,  standered output is expected to be on stan-
          dard output. The program will give an error message  if
          the  output  file  is  being written to a write protect
          directory.  (default is standard output )

     -d2neg d2neg
          Far trace distance to use:  negative  side  of  spread.
          (default = largest negative distance )

     -d1neg d1neg
          Near trace distance to use: negative  side  of  spread.
          (default = smallest negative distance )

     -d1pos d1pos
          Near trace distance to use: positive  side  of  spread.
          (default = smallest positive distance )

     -d2pos d2pos
          Far trace distance to use:  positive  side  of  spread.
          (default = largest positive distance )

     -rs irs
          First record to process. (default = 1 )

     -re ire
          Last record to process. (default = all )

     -ns ns
          First trace in each record to process. (default = 1 )

     -ne ne
          Last trace in each record to process. (default = all )

     -tr ntpr
          Enter output number of traces per record.  If necessary
          last  record will be padded with dead traces.  (default
          = 1 )

     -gath igath
          Enter number of traces/gather to be summed (the default
          is  the  input  number traces/gather).  This may be any
          number from 1 to the total  number  of  traces  in  the
          input  data set.  Note: if this number is not defaulted
          or not equal to the input traces/gather you cannot  use
          the  rs, re and  ns, ne options 1 )

     -pw iexp
          Enter nth root stacking power.   The  samples  of  each
          trace  in  the  gather  are  first raised to the 1/iexp
          power before summing.  After all the traces in the gath
          er  have  been  summed  the result is the raised to the
          iexp power.  (default = 1)

     -S   If present normalize output traces  by  the  number  of
          live traces in the gather

     -V   Verbose mode.  All parameters from the command line and
          lineheader will be sent to standard error output.

     -?   Query  mode.   With  this  flag,  stackc  will  send  a
          description  of the command line arguments to the stan-
          dard error output and stop.

BUGS

     No trap for running program without an input file and  noth-
     ing in the standard input.

SEE ALSO

     sisplt(1), filt(1), scan(1), select(1),

AUTHORS

     K. B. Taylor and R. B.  Herrmann,  Saint  Louis  University.
     (1986)

COPYRIGHT

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