NAME

     scspec - Scaling routine for use with spectral decomposition
     (spec).

SYNOPSIS

     scspec [ -Nfile_in ] [ -Ofile_out ] [  -scalescalefile  ]  [
     -int ] [ -max ] [ -prewprewhitener ]

DESCRIPTION

     When spec (spectral decomposition) is run on a  dataset,  an
     additional   flat   file   is  output  (by  default,  called
     spec_scale_file).  This file gives the maximum amplitude for
     each  of  the  ouptut frequencies.  scspec uses this file to
     scale the output from spec (by default) to values between  0
     and  1.  This relative scaling allows for simpler comparison
     between frequencies in tools like xsd.

USAGE

     Because scspec depends on  the  spec_scale_file  from  spec,
     spec  output  may  NOT  be  piped into scspec.  Instead, the
     scaling must be run as a separate step.

  Command line arguments
     -N file_in
          Enter the input data set name or file immediately after
          typing  -N.   The  file  is not required when receiving
          piped input from another process  (with  the  exception
          that  you  cannot  directly  pipe output from spec into
          scspec).  The input file should  include  the  complete
          path name if the file resides in a different directory.
          Missing data should  be  padded  in  with  dead  traces
          flagged by the dead trace header flag 'StaCor'=30000.

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

     -scale spec_scale_file
          If the name of the output scale file from spec  is  not
          spec_scale_file,  then  you  can  enter the name of the
          file after the option -scale.

     -int When  specified,  produce  output  in  the   range   (-
          128..+127).   By  default, all results are in the range
          0..1.

     -max When specified, produce output scaled between 0 and the
          maximum  value  for  all frequencies found in the scale
          file.

     -prew prewhitening
          scspec normalizes the spec output  using  the  relation
          1/(maxampl(f)     +     (max(maxampl)*prew)),     where
          max(maxampl) is the maximum amplitude over all frequen-
          cies  and prew is a prewhitening value (Default: prew =
          .00).

SEE ALSO

     spec

CONTRACT AGREEMENT

     This product is brought to you by Research  Contract  Agree-
     ment  548  (Seismic coherency cube). Thank you for your sup-
     port.

AUTHORS

     Kurt Marfurt and Kelly Crawford (1997).

COPYRIGHT

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