NAME

     amst  - 2D filtering/shaping

SYNOPSIS

     amst [ -Nntap ] [ -Ootap ] [ -mmode ] [ -f1minf ] [  -f2midl
     ] [ -f3midh ] [ -f4maxf ] [ -dxdx ] [ -dydy ] [ -? ]

DESCRIPTION

     amst does a 2D  filtering/shaping  operation  on  a  seismic
     record.  The  record  is treated as a 2D object (i.e. a pic-
     ture) and the filter points define an elliptical zone,  i.e.
     a  radial filter in KxKy. It was originally written by Billy
     Moore to process potential field data.

     amst gets both its data and its parameters from command line
     arguments.   These  arguments specify the input, output, the
     mode, the frequency range, and the vertical  and  horizontal
     aspect.

  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).

     -m mode
          Enter operation mode: 0 = filter output; 1 =  residual.
          Default = 0.

     -f1 minf
          Enter the minimum frequency of the filter.   The  input
          units  are  assumed to be 1 so the nyquist frequency is
          1000. Default = 0.

     -f2 midl
          Enter the midrange low frequency limit. Default = 0.

     -f3 midh
          Enter the midrange  high  frequency  limit.  Default  =
          nyquist.

     -f4 maxf
          Enter the high frequency limit. Default = nyquist.

     -dx dx
          Enter the vertical sample unit. Default = 1.0

     -dy dy
          Enter the horizontal sample unit. Default = 1.0

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

BUGS

     unknown

AUTHOR

     Original USP code by Billy Moore

COPYRIGHT

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