NAME

     instphz  - compute instantaneous phase

SYNOPSIS

     instphz [ -Nntap ] [ -Ootap ] [ -nsnstr  ]  [  -nenetr  ]  [
     -rsnrst ] [ -renred ] [ -wnpoint ] [ -S ] [ -R ] [ -W ] [ -V
     ] [ -? ]

DESCRIPTION

     instphz computes the instantaneous phase vs time standard or
     seismic data.  The outputs are standard sis format 3 data.

     instphz 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.
     The algorithms are lifted from Rene' et al, Geophysics, June
     1986, pp 1235-1251.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing  -N.   If piping in this command line entry will
          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 for the  instan-
          taneous  phase  data immediately after typing -O unless
          the output is to be piped.  The output  data  set  also
          requires the full path name (see above).

     -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.

     -w npoint
          Enter the length in  points  of  the  smoothing  to  be
          applied  to  the  phase  curve  (default  =  10).   The
          smoothing is applied to the signal and  its  quadrature
          before the arctangent calculation.

     -S   Enter the command line  argument  '-S'  to  square  the
          input  data  (with  sign) before computing phase.  Only
          one of -S or -R should be chosen.

     -R   Enter the command line  argument  '-R'  to  square  the
          input data (without sign) before computing phase.  Only
          one of -S or -R should be chosen.

     -W   Enter the command line argument '-W' cause the phase to
          be  limited  to  +  or  -  pi  otherwise  the  phase is
          unwrapped into a monotonic continuous function

     -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.

COPYRIGHT

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