NAME

     wrdt  - write  trace  distances;  recalculate  source  point
     numbers

SYNOPSIS

     wrdt [ -Nntap ] [ -Ootap ] [ [ -Ddtap ] [ -gidx ] [ -x0x0  ]
     ] [ -cdpintcdpint ] [ -sscl ] [ -S1 ] [ -V ] [ -? ]

DESCRIPTION

     wrdt puts new trace distances in the trace headers

     wrdt gets its necessary information from  the  command  line
     arguments.   These  arguments  specify  the input and output
     data sets, the group interval, trace offset or file contain-
     ing  trace  distances, cdp interval, source point scale fac-
     tor, and source point recalculation flag.

     The trace distances are written into the signed  trace  dis-
     tance  header  word (DstSgn) and the unsigned trace distance
     header word (DstUsg).

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing -N.  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 'vsp' stored on the 'b' disk.

     -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).

     -D dtap
          Trace distance option 1:  enter  file  name  containing
          trace  distances, one entry per line. This is useful if
          distances are irregular. There must be exactly as  many
          entries  as  there  are  trace  per record in the input
          data. Default is to  look  for  command  line  distance
          input (see below).

     -gi dx
          Trace distance option 2: enter the group interval in ft
          or  m.  If this value is not entered the program passes
          the old trace distances.

     -x0 x0
          Trace distance option 2: enter the near trace offset in
          ft  or m.  Both x0 and gi may be negative numbers to do
          split  spreads  and   spreads   that   have   distances
          decreasing with trace number.

     -S1  Enter the command line argument  '-S1'  to  recalculate
          source   point   numbers   assuming   receiver  indices
          (mnemonic RecInd) are correct.  The equation used is

          src_pt_number = rcvr_number + (offset / cdp_interval)

     -cdp cdpint
          Enter the CDP interval in ft or m.  If -S1  is  present
          this value must be entered - no default.

     -s scl
          Enter the factor to scale the source point number (i.e.
          the value that goes in mnemonic SrcLoc). Default is 10.

     -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.

COPYRIGHT

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