NAME

     smedian -  Spatial median/mean smoothing

SYNOPSIS

     smedian [ -Nntap ] [ -Ootap ]  [  -rsirs  ]  [  -reire  ]  [
     -xsmoothxsmth  ]  [ -zsmoothxsmth ] [ -median ] [ -angle ] [
     -st ] [ -V ] [ -? ]

DESCRIPTION

     smedian replaces a sample value  with  the  median  or  mean
     statistic  derived  from  a user defined rectangular window,
     thus smoothing and/or interpolating input data. This  action
     happens with-in a record.

     A special provision is made  for  use  with  incident  angle
     fields  which are calculated in avomig and output using ian-
     gle.

     smedian gets data and parameters  from  command  line  argu-
     ments.  These  arguments  specify the input and output trace
     data.

  Command line arguments
     -Nntap
          Enter input data set name  or  file  immediately  after
          typing  -N;  entering  nothing  specifies a stdin pipe.
          This 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 subdirectory 'vsp' stored in directory b.

     -Ootap
          Enter output data set name or  file  immediately  after
          typing  -O.  This output file is not required when pip-
          ing the output to another process.  The output data set
          also requires the full path name (see above).

     -rs irs
          first record to process.         (default = 1)

     -re ire
          last record to process.          (default = all)

     -ns ns
          first trace in record to process. (default = 1)

     -ne ne
          last trace in record to process.  (default = all)

     -xsmooth xsmth
          half the window length (in traces) across traces to use
          in computing statistics (default = 0)

     -zsmooth zsmth
          half the window length (in samples) with-in a trace  to
          use in computing statistics (default = 0)

     -median
          Enter '-median' to use median instead of  mean  statis-
          tics

     -st  flag if input data stacked

     -angle
          Enter '-angle' and the program expects an  input  angle
          field  calculated with MBS program iangle. Attempts are
          made to preserve the values in the mute zone  and  wild
          card  (90  degrees)  values (which indicate meaningless
          information was found here) are not used in the  compu-
          tation of statistics.

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

     -?   Enter this (or '-?' if you are running in  c-shell)  to
          get  online  help.   The  program  will terminate after
          printing a list of parameters.

BUGS

     - unknown

SEE ALSO

     iangle avomig

AUTHOR

     W. P. May, 1995 updates R. Crider, 2000

COPYRIGHT

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