NAME

     envelop  - module to compute envelop traces

SYNOPSIS

     envelop [ -Nntap ] [ -Ootap ] [ -sist ] [ -eiend ] [ -nsnstr
     ] [ -nenetr ] [ -rsnrst ] [ -renred ] [ -V ] [ -? ]

DESCRIPTION

     envelop takes selected portions of trace data  and  computes
     the  envelop  trace  (the  vector product of the input trace
     with its hilbert transform).

     envelop gets both its data and its parameters  from  command
     line  arguments.  These arguments specify the input, output,
     the start and end times, the start and end traces, the start
     and end records, and verbose printout, if desired.

  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 '/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).

     -s ist
          Enter the start time.  The default is the beginning  of
          the trace.

     -e iend
          Enter the end time.  The default  is  the  end  of  the
          trace.

     -ns nstr
          Enter the start trace number.  Trace numbers below this
          value will not be processed.  The default is 1.

     -ne netr
          Enter the end trace number.  Trace numbers  above  this
          value  will  not be processed.  The default is the last
          trace number on the input data set.

     -rs nrst
          Enter start record number.  Default value is the  first
          record.

     -re nred
          Enter end record number.  Default value is last record.

     -V   Enter the command line argument '-V' to get  additional
          printout.

     -?   Enter the command line argument  '-?'  to  get  on-line
          help  screen.   The  program  stops  after printing the
          screen.

COPYRIGHT

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