NAME

     bdnmo  - module to apply/remove t(x,v) nmo correction

SYNOPSIS

     bdnmo [ -Nntap ] [ -Ootap ] [ -vvtap ] [ -cvcvel ] [ -vsvscl
     ]  [ -Hwhdrwrd ] [ -rsirs ] [ -reire ] [ -svvrs ] [ -evvre ]
     [ -nsns ] [ -nene ] [ -S ] [ -R ] [ -T ] [ -E ] [ -B ] [  -V
     ] [ -XYrace ] [ -debug ] [ -? -h -help ]

DESCRIPTION

     bdnmo takes a set of input traces and  applies  the  dynamic
     correction  given  by the t(x,v) moveout equation.  Velocity
     is a function of time and is read in from  a  velocity  disk
     file  as  created  by  velin,   vomit  or vi3d. Cubic spline
     interpolation is used in the application /  removal  of  the
     NMO  correction.   The  user  may choose to output data from
     before or after the velocity cross-over point in the moveout
     map. The default is to output data from after the cross-over
     point only.  Should more than a  single velocity  cross-over
     exist  for  a  given  trace  only the last will be used.  An
     optional xgraph output dataset of the  nmo  map  at  a  user
     defined trace location is available.

     bdnmo gets processing controls from the command line.   Rea-
     sonable  defaults are set up.  In addition, if no input file
     name is given, the binary trace data are expected to  be  on
     the standard input. However, a velocity model must be speci-
     fied.

  Command line arguments
     -N ntap
          Enter the full path of the  file  containing  the  data
          set.   If  not specified, input is expected to be stan-
          dard input.  If standard input  is  not  specified  and
          there  is  no  input,  e.g., program run in background,
          expect a termination. (default standard input )

     -O otap
          Enter the full path of the output file.  If not  speci-
          fied,   output  is  expected  to  be  standard  output.
          (default standard output )

     -v vtap
          Enter the full path of the file containing the velocity
          model.   This  file  is  in  USP format of RMS velocity
          versus two way travel time.  The  velocity  model  must
          have the same sample interval and number of samples per
          trace as the attached seismic data.  For 2D data  there
          should  be one velocity trace per input seismic record.
          Should the number of traces be less than the number  of
          associated  seismic  records,  the  last velocity trace
          will be used for all remaining records.   For  3D  data
          there  should  be  as many velocity traces as there are
          bins being corrected. Should  there  be  less  velocity
          data  than  required,  the  last  velocity trace in the
          model will be  used  to  correct  all  remaining  bins.
          (default none ).

     -cv cvel
          Optional constant velocity value.   If  this  value  is
          nonzero  the all other velocity options will be ignored
          and no velocity file need be entered.

     -vs vscl
          Enter the scale factor  to  apply  to  all  velocities.
          (default = 1.0 ).

     -Hw hdrwrd
          Enter the trace header word mnemonic to extract  signed
          trace distance. Default = DstSgn

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

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

     -rs irs
          First  record to process (default = 1 )

     -re ire
          Last  record to process (default = all )

     -sv vrs
          First velocity record to process (default =  1  ).   If
          attaching  a 3D velocity cube containing N records of M
          traces [i.e. N li's and Mdi's as output by vi3d ] enter
          the  appropriate  start  li number.  If you have utop'd
          the velocity cube to be N x M single trace records then
          enter the appropriate start bin number.

     -ev vre
          Last  velocity record to process  (default  =  all  )If
          attaching  a 3D velocity cube containing N records of M
          traces [i.e. N li's and Mdi's as output by vi3d ] enter
          the  appropriate end li number.  If you have utop'd the
          velocity cube to be N x M  single  trace  records  then
          enter the appropriate end bin number.

     -E   If present data associated  with  the  portion  of  the
          moveout  map  below  the last sample cross-over will be
          output.


     -T   If present data associated  with  the  portion  of  the
          moveout  map  above  the last sample cross-over will be
          output.(note: strange things could occur when  applying
          nmo,  filtering, then removing nmo should more than one
          sample cross-over be present)

     -S   If present apply internal trace header statics  (before
          nmo).

     -R   If present remove normal moveout

     -B   If present  input  velocity  function  is  expected  in
          decreasing shot order.

     -XY trace
          If present the normal moveout sample map for the  trace
          requested  will  be  output  to  a file name bdnmo_fcn.
          This file may be accessed by xgraph for a plot  of  the
          function. (i.e. xgraph -fg black -bg white -zg black -t
          "Moveout Sample Map" -y "sample  in"  -x  "sample  out"
          bdnmo_fcn)

     -V   Verbose mode. List command line  and  lineheader  input
          parameters.

     -debug
          Very Verbose mode. List RecNum, TrcNum for  each  velo-
          city  trace  and  RecNum, TrcNum, sequential record and
          sequential trace for each seismic trace read.  This  is
          useful  to  make certain that the correct velocity from
          your velocity volume is being applied at a given record
          of  interest.   Warning  however, this will result in a
          very large printout file and should be used for  debug-
          ging problems only [as the name suggests].

     -? -h -help
          Query mode.  With this flag, bdnmo will give a descrip-
          tion  of  the  command line arguments and stop the pro-
          gram.

BUGS

     Unknown

AUTHOR

     P. G. A. Garossino, EPTG Tulsa  [pgarossino@amoco.com  Socon
     422-3932]

COPYRIGHT

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