NAME

     simindex  - calculate similarity indices across a gather.

SYNOPSIS

     simindex [ -Nntap ] [ -Ootap ] [ -algialg ] [ -V ] [ -? ]

DESCRIPTION

     simindex calculates the similarity index of a seismic record
     using  one of several alternative algorithms. Calculation of
     the similarity index on a common reflection point gather  in
     (x,z)   space   can  give  a  quantitative  measure  of  how
     similar/flat the seismic events are.

     simindex gets both its data and its parameters from  command
     line  arguments.  These arguments specify the input, output,
     the start and end traces, 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.  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'.

     -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).

     -alg ialg
          Enter one  of  the  following  numbers  to  invoke  the
          corresponding algorithm:
                 1...conventional semblance.
                 2...stack energy.
                 3...rms emergy weighted semblance.
                 4...signed rms emergy weighted semblance.
                 5...envelope  of  stack  squared  over  sum   of
          envelopes squared (default).
                 6...signed envelope of stack squared over sum of
          envelopes squared.


     -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.

SEE ALSO:

     stack

AUTHORS

     Kurt J. Marfurt and Roelof Versteeg (APR) 1992.

COPYRIGHT

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