NAME

     fxsns - Sort and Sum Migrated Records by GI (RecInd)

SYNOPSIS

     [-Nntap] [-Ootap] [-O2otap2]  [-GEOMgeom]  [-gisgifirst]  [-
     giegilast] [-gincginc] [-V] [-?]  [-h]

DESCRIPTION

     fxsns reads shot records from the FX prestack shot migration
     program  fxsmig  and  produces a sorted section and a summed
     section. Since the traces are summed and  sorted  in  RecInd
     (GI)  order,  the  records of the sorted dataset will have a
     common RecInd. The parameter ginc can be used  for  skipping
     GI's.

  Command line arguments
     -Nntap
          Enter the dataset name of the input seismic data  after
          typing  -N. 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 'vsp' stored on the 'b' disk.
          The input cannot be a pipe.

     -Ootap
          Enter the dataset name of the  output  stacked  seismic
          data  after  typing  -O.  A stdout pipe is assumed when
          this flag is missing from the command line.

     -O2otap2
          Enter the dataset name of  the  output  sorted  seismic
          data  after  typing  -O2. A stdout pipe is assumed when
          this flag is missing from the command line. The  output
          datasets cannot both be pipes.

     -GEOMgeom
          This is the dataset name of the geometry file (the out-
          put from program prepmig). If this dataset is available
          the minimum and maximum record index will be read  from
          this  file  by the program, and flags for -gis and -gie
          as described below should be left off the command line.

          If this dataset is not available, the -GEOM flag should
          be  left  off the command line. The minimum and maximum
          record index (RecInd) can be acquired by  running  pro-
          gram scan on the input dataset, and flags -gis and -gie
          should appear on the command line as described below.

     -gisgifirst
          This value is the RecInd (GI) of record one, trace  one
          of  the  input  data. If the geometry dataset is avail-
          able, gifirst will be read from it, and the  -gis  flag
          can be omitted from the command line.

          If the geometry file is not available, use program scan
          to look at the trace headers to determine the RecInd of
          the first trace  of  the  first  record  of  the  input
          seismic  data, and place this value on the command line
          with flag -gis.

     -giegilast
          This value is the RecInd (GI) of the last live trace of
          the  last  record  of  the  input seismic data.  If the
          geometry dataset is available, gilast will be read from
          it,  and  the -gie flag can be omitted from the command
          line.

          If the geometry file is not available, use program scan
          to look at the trace headers to determine the RecInd of
          the last live trace of the last  record  of  the  input
          seismic  data, and place this value on the command line
          with flag -gie.

     -gincginc
          This value is the increment through the  GI's  for  the
          sorted  output  dataset.   Use ginc greater than one to
          skip GI's.

     -V   Enter -V for a verbose printout.

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

     -?   Enter -? for online help. The  program  will  terminate
          after printing this.

SEE ALSO

     mbs, fxsmig, prepmig, fxprep

BUGS

     None known.

AUTHOR

     Mary Ann Thornton

COPYRIGHT

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