NAME

     cogeom2d -  Extracts  coherency  data  for  use  in  texture
     analysis

SYNOPSIS

     cogeom2d [ -N file_in ] [ -O file_out ] [ -halfwin halfwin ]
     [ -coarse coarse ] [ -par par ] [ -lwin lwin ] [ -h1 ] [ -h2
     ] [ -h3 ] [ -h4 ] [ -tdatum sltime ] [ -? ]

DESCRIPTION

     cogeom2d This utility extracts a horizon  or  a  time  slice
     from a 3D coherency data set.  Then it produces a measure of
     the coherence between label sites which are near  neighbors.
     The  measure  of the coherence between the near neighbors is
     the minimum value found on the line connecting and including
     the  data  sites  which  correspond  to the two label sites.
     Then these values are written to a file which can be used by
     any segmentation optimizer, such as bethe, as a threshold.

     cogeom2d gets all its parameters  from  command  line  argu-
     ments.  These arguments specify the input, output, etc.

COMMAND LINE ARGUMENTS

     -N file_in
          input file containing coherency for a 3D data set.   If
          the file is not in the current directory, the full path
          should be specified.  (Default:  stdin)

     -O file_out
          output file containing an  estimate  of  the  coherence
          between each label position and its near neighbors in a
          horizon or a time slice that was extracted from the  3D
          coherency data.  (Default:  stdout)

GENERAL OPTIONS

     -coarse coarseness
          inverse of the resolution at which the segmentation  is
          performed.   That  is,  the  ratio  of  the  number  of
          samples/traces in the data lattice  to  the  number  of
          samples/traces  in the label lattice.  The data lattice
          is the input to the program texture, and the label lat-
          tice  is  the  output  from any segmentation optimizer,
          such as bethe.  For highest resolution set the  coarse-
          ness to 1.  (Default: 9)

     -halfwin half_win_size
          half window width used to determine the  width  of  the
          texture  analysis  window over which the cdf's are com-
          puted in the program disparity.  The width of the  tex-
          ture analysis window is given by 2 * half_win_size + 1.
          (Default: 7)

     -h1 | -h2 | -h3 | -h4 | -tdatum sltime
          only one of these options can be specified on the  com-
          mand  line.   If the -h1 flag is set, this program will
          extract the first horizon from the coherency  file  and
          operate  on  it.   If the -h2 flag is set, this program
          will extract the second horizon and operate on it, etc.
          If the -tdatum option is used, the program will operate
          on the slice at time sltime.  (Default:  -tdatum 0.0)

     -h, -?, -help
          Help.

See Also

     texture2d, bethe2d, combine2d,  disparity2d,  randomgraph2d,
     texstat2d, brightsizing

REFERENCES

     Crawford,  Kelly,  and  Marfurt,  Kurt,  1997.   2D  Texture
     Analysis:   A  User's  Guide, Amoco Geoscience Research Bul-
     letin F97-G-14.

     Hoelting, Cory and Kelly, Ken, 1996.   Texture  Analysis  of
     Spectral  Decomposition Data Using a Segmentation Algorithm,
     Amoco Geoscience Research Bulletin F96-G-21.

     Matheney, Mike and Kelly, Ken, 1995.  Texture-Based  Segmen-
     tation  of  3-D Seismic Data, Amoco Geoscience Research Bul-
     letin F95-G-29.

CONTRACT AGREEMENT

     This product is brought to you by  Research  Agreement  #548
     (The Seismic Coherency Cube). Thank you for your support!

AUTHOR

     Cory Hoelting and Ken Kelly (E&PTG, Tulsa, OK, USA).

COPYRIGHT

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