NAME

     spacetrp  - spactially interpolate data to  arbitrary  group
     interval

SYNOPSIS

     spacetrp [ -Nntap ] [ -Ootap ] [ -isii ] [ -osio ] [  -llive
     ] [ -V ] [ -? ]

DESCRIPTION

     spacetrp interpolates data to an  arbitrary  spatial  sample
     interval  using  cubic spline algorithm.  It serves the same
     functionality as the old SPIN program.  Trace header indices
     are also interpolated so no re-prep should be necessary.

     spacetrp gets both its data and its parameters from  command
     line  arguments.  These arguments specify the input, output,
     the new group interval in ft or m, the start and end traces,
     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).

     -i sii
          Enter the input group interval in ft or m.  No default.
          sii/sio  (or  sio/sii  if decimating) should be a whole
          number (see BUGS).  These two parameters  are  entirely
          independent  of the actual group interval and are meant
          only to establish exactly how many  traces  are  to  be
          interpolated in between the originals.

     -o sio
          Enter the  output  group  interval  in  ft  or  m.   No
          default.

     -l live
          If greater than zero force the number of live traces to
          be  at  least  live  in number (per record).  If traces
          were to be dead they will be zeroed out before  marking
          them live.

     -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.

BUGS

     Note: for CDP data when rolling on or off the line  and  the
     number  of live traces is 3 or fewer the interpolation won't
     be very good.

     spacetrp only guarantees correctly interpolated  headers  if
     the -i -o command line arguments form an integer ratio, e.g.
     -i60 -o15

COPYRIGHT

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