NAME

     sns - Sort and Sum Seismic Records

SYNOPSIS

     sns  [-Nntap]  [-SORTsotap]  [-STAKsttap]  [-MAXSAMPmaxsamp]
     [-Iskip]    [-MIXmix]    [-Aalpha]    [-Xxmult]    [-Eexpnt]
     [-Rrenumber-sort] [-rsrenumber-stack] [-V] [-h] [-?]

DESCRIPTION

     sns reads common-offset or common-angle data and creates two
     datasets:

        the first dataset is sorted and edited
        the second dataset is stacked and scaled
        according to the formula:
        g(z) = [xmult*(z**alpha)*10**expnt]*(f(z)/dz)

     The sorted dataset is normally used to  quality-control  the
     velocity field after prestack depth migration.

  Command line arguments
     -Nntap
          Enter the input dataset name after  typing  -N.   These
          data  are  either  common  offset  seismic  records  or
          common-angle seismic  records.   Normally,  this  is  a
          dataset output from a prestack depth migration program.

     -SORTsotap
          Enter the  sorted  output  dataset  name  after  typing
          -SORT.   This  sort  will  interchange  the  traces and
          records (i.e., a file containing 100 records  with  500
          traces/record  will  be  output as 500 records with 100
          traces/record).

     -STAKsttap
          Enter the stacked  output  dataset  name  after  typing
          -STAK.  Normally, this will be a stacked migrated depth
          section.

     -MAXSAMPmaxsamp
          Enter the maximum number of samples on the output after
          typing  -MAXSAMP.   This number overrides the number of
          samples in the input data and pads each of  the  output
          traces to this number.

     -Iskip
          Enter the trace skipping increment  for  output  sorted
          data  after  typing  -I.  This skip does not affect the
          stacking process. Use the number of records to make the
          sort and the stack close to the same size. For no skip-
          ping, enter 1.  The default is 1 for no skipping.

     -Aalpha
          Enter the depth exponent (for scaling) after typing -A.
          Default is .5.

     -XXMULT
          Enter the constant multiplier (for scaling) after  typ-
          ing -X. Default is 1.

     -Eexpnt
          Enter the exponent for power of 10 (for scaling)  after
          typing -E. Default is 0.

     -MIXmix
          Enter the number of sorted traces to mix.   Default  is
          0.

     -Rrenumber-sort
          Enter the flag for renumbering the output traces on the
          sorted dataset after typing -R.  Default is 0.
                0 = number the output sorted traces as one
                    record with many traces.
                1 = number the output traces with
                    record = "input trace" and
                    trace  = "input record".

     -rsrenumber-stak
          Enter the flag for renumbering the output traces on the stacked
          dataset after typing -rs.  Default is the value entered for the
          renumber-sort:
                0 = number the output stack as
                    one record with many traces.
                1 = number the output stack with
                    many records with one trace
                    per record.

     -V   Enter -V for a verbose printout.

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

     -?   Enter this (or '-?' if you are running in c-shell) to get online help.
          The program will terminate after printing this.

BUGS

     No known bugs.

SEE ALSO

     rstak, editt, xrpm

AUTHOR

     Rick Cook, Gary Murphy

COPYRIGHT

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