NAME

     zsqueeze - squeeze data lying on a regular depth grid to  an
     inequally sampled depth grid.

SYNOPSIS

     zsqueeze [ -Nfile_reg ] [ -Ofile_irreg ] [ -Zfile_zeta  ]  [
     -V ] [ -? ]

DESCRIPTION

     zsqueeze was designed to efficiently resample the  input  of
     the  2D  Kirchhoff modelization algorithm kmod to an irregu-
     larly sampled grid in depth using a  6  point  interpolation
     algorithm.  This  routine,  when  included in the piped flow
     'prepmod;vsm|vsamp;kray;zsqueeze|kmod'  will  result  in   a
     prestack depth modelization.

     zsqueeze gets both its data and its parameters from  command
     line arguments.  These arguments specify the input, outputs,
     and certain floating point values to  override  the  current
     restrictions to trace header integer values.

  Command line arguments
     -N file_reg [default = stdin]
          Enter the input regularly sampled depth data  set  file
          name immediately after typing -N unless data are coming
          in from a pipe in which case the -N option  should  not
          be  entered.   This  input file should include the com-
          plete 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 file_irreg [default = stdout]
          Enter the output irregularly  sampled  depth  data  set
          file  name after the -O option or, if data are going to
          a pipe, the -O option should not be entered.

     -Z file_zeta
          Enter  the  input  irregular  depth  sample  file  name
          immediately  after typing -Z. The file following the -Z
          option was the output file following the -Z  option  in
          routine  vsamp.  This  input data set requires the full
          path name (see above).

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

BUGS

     No bugs known at present.

SEE ALSO

     vsm, vsamp, kray, kmod, tstretch

AUTHOR

     B. Duquet (APR) inspired by program zstretch.

COPYRIGHT

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