NAME

     zombie  - module to bring induvidual traces  back  from  the
     dead.

SYNOPSIS

     zombie [ -Nntap ] [ -Ootap ] [ -sist ] [ -eiend ] [  -rsnrst
     ] [ -renred ] [ -iternum ] [ -S ] [ -single ] [ -V ] [ -? ]

DESCRIPTION

     zombie will interpolate any trace with  StaCor =  30000   OR
     whose  dot product is zero  by values interpolated from sur-
     rounding live traces by  either  a  simple  adjacent  sample
     average  (  the  default  ) or a sameness search algorithm (
     -S).  The sameness algorithm looks at the  sign  of  samples
     around the sample to be interpolated and averages the set of
     samples with the same sign.  If more than one set  have  the
     same  sign  then  the  maximum  amplitude is used to further
     decide on the make up of the average.  Visually the  default
     is:

               x -- o -- y : o = (x+y)/2

      while the star search is:

               xt -- - -- yt
               x  -- o -- y
               xb -- - -- yb

     where one of  (xt+yb)/2  ,  (x+y)/2  or  (xb+yt)/2  is  used
     depending  on  the  weighting for sameness which is based on
     sign.

     If you find that the steeper dips in your data are not  han-
     dled  well by either algorithm try preconditioning your data
     with a pass through  vred  or  bdnmo to lessen the  dips  of
     the offensive events prior to running  zombie . ie:

      vred  -Ndead  -vred3000  |  zombie  |  vred  -U   -vred3000
     -Oliving_dead

     Oftentimes single dead traces can be interpolated reasonably
     well  but groups of traces fare poorly.  To interpolate sin-
     gle dead traces and leave groups of dead  traces  alone  use
     the   -single   flag  [see  below].   Should  groups of dead
     traces be the goal  of  the  interpolation  try  the   -iter
     option  to allow zombie to build up the interpolation within
     the zone one pass at a time.  Each successive pass will  see
     both  the  interpolated  and  original  data on the affected
     traces.  In all instances the resulting  StaCor  value  will
     be interpolated from surrounding live traces.


     zombie gets both its data and its  parameters  from  command
     line  arguments.  These arguments specify the input, output,
     the window start and end times, start and end traces,  start
     and end records, number of iterations, type of interpolation
     algorithm 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).

     -s ist
          Enter the start time  of  the  design  window  in  mil-
          liseconds.  The default is the beginning of the trace.

     -e iend
          Enter the  end  time  of  the  design  window  in  mil-
          liseconds.  The default is the end of the trace.

     -ns ns
          Enter the start trace.  The default is the first  trace
          of a record.

     -ne ne
          Enter the end trace.  The default is the last trace  of
          a record.

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

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

     -iter num
          Enter the desired number of iterations.  Default  value
          is 1.

     -single
          Enter the command line argument '-single' if  you  wish
          to  interpolate single dead traces while passing groups
          of   adjacent   dead   traces   unaffected    by    the
          interpolation.   To  use  this  option your dead traces
          should be flagged with a StaCor value of 30000  as  the
          algorithm  looks ahead and behind the current trace for
          dead trace flag information.   There  is  no  guarantee
          what  will  happen  if you use this option without dead
          traces being flagged as dead.  If you need to flag your
          dead traces use  clean -Z.

     -S   Enter the command line argument '-S' to  use  the  star
          search algorithm described above.

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

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

BUGS

     unknown

SEE ALSO

     interpl(1) gentrp(1) spacetrp(1) slvr(1)

AUTHOR

     P.G.A. Garossino, EPTG, pgarossino@amoco.com, SOCON 422-3932

COPYRIGHT

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