NAME

     SPBL  - module to perform  spatial  balancing  of  amplitude
     spectra

SYNOPSIS

     SPBL [ -Nntap ] [ -Ootap ] [ -Dcard image file ] [ -ws  ]  [
     -we  ]  [ -nt ] [ -adotap ] [ -v1card image file ] [ -v2 ] [
     -vfl ] [ -op ] [ -dk ] [ -rs ] [ -re ] [ -? ] [ -H ]

DESCRIPTION

     SPBL computes the geometric or algebraic mean of the  ampli-
     tude  spectra  of all traces within a record.  The amplitude
     spectrum of each output trace is scaled to the average spec-
     trum  in a zero-phase manner.  The effect of this scaling is
     to significantly attenuate spurious noise,  such  as  ground
     roll,  when the frequency of the noise is anomalous relative
     to the mean spectrum.

     SPBL gets its data  from  command  line  arguments  and  its
     paramters  either  from  a  card  image file or command line
     arguments.  Parameters are documented in the SIS  documenta-
     tion for Program SPBL.

     NOTE:  This programs output ALL records from the input  data
     set.    Only   those   records   specified   by  the  record
     start/record end parameters will be processed, however.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately 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.

     -O otap
          Enter the output data  set  name  or  file  immediately
          after typing -O.  The output data set also requires the
          full path name (see above).

     -D card image file
          Enter the name of the file  containing  the  parmameter
          card  images.   See  the  SIS documentation for Program
          SPBL for card image and parameter descriptions.  If  no
          data  card  image is supplies, parameters will be taken
          from command line arguments.

     -ws window start time
          Enter the time for the start  of  the  operator  design
          window (in ms).  Default is 0.


     -we window end time
          Enter the time for the end of the operator design  win-
          dow (in ms).  Default is end of trace.

     -nt number traces to average
          Enter the number of traces to be averaged for  operator
          design.   This  number  of traces will be balanced with
          the designed operator.

     -ad add one - drop one processing
          Enter this parameter if add one - drop one (roll-along)
          processing  is  desired.   This  option is VERY compute
          intensive.

     -v1 window start correction velocity
          Enter the velocity (in f/ms or m/ms) with which to vary
          the  window  start  time  as a funtion of offset.  This
          option is very useful when the design window may other-
          wise  include  first  break  zones  and  earlier times.
          Default is no variation.

     -v2 window end correction velocity
          Enter the velocity (in f/ms or m/ms) with which to vary
          the window end time as a funtion of offset.  Default is
          no variation.

     -vfl window correction type
          Enter the indicator for the type of window time correc-
          tion.   Enter  0  for  linear  and  1  for  hyperbolic.
          Default is linear.

     -op processing type
          Enter the indicator for the  type  of  averaging  used.
          Enter 0 for geometric and 1 for arithmetic.  Default is
          geometric.

     -dk deconvolution flag
          Enter this  parameter  if  deconvolution,  rather  than
          balancing, is desired.  Default is no.

     -rs start record
          Enter the first relative sequential record to  process.
          Default is the first record in the data set.  (This has
          changed:  it used to be the actual number of the  first
          record to process.)

     -re end record
          Enter the last relative sequential record  to  process.
          Default  is the last record in the data set.  (This has
          changed:  it used to be the actual number of  the  last
          record to process.)

     -?  Enter the command line argument '-?' to get online help.
     The program terminates after the help screen is printed.

     -H Enter the command line argument -H to  get  online  help.
     The program terminates after the help screen is printed.

AUTHOR

        Richard Crider ES&S  Houston

COPYRIGHT

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