EdgeTech Sub-bottom profilers.

    There are at least three different Edgetech "Star" systems, each SEG-Y
different from the others.

    The GeoStar system is based on a PC, converts to depth, and writes in
a format somewhat, but not very, similar to SEG-Y.

    There are two Xstar systems; one records 1 trace and the other 2 traces.
Unfortunately it is impossible to tell these two systems apart according to
the SEG-Y binary headers.

                          GeoStar
    The GeoStar data files must be converted to SEG-Y before SIOSEIS can read
them.  Program gstar2segy creates the SEG-Y file headers, moves things around
in the trace header and does byte swapping so the file can be read by process
diskin without using "format edgetech".  The data are still complex and must
go through SIOSEIS process XSTAR.  The GeoStar converted the sample interval
into depth.  e.g.
>gstar2segy 14_56_00.01a 
  creating file yr2002day116-1456z.segy 
>lsd yr2002day116-1456z.segy 1 4
      SHOT   TR       RP    TR ID  RANGE DELAY NSAMPS    SI   YR DAY HR MIN SEC
      6287     1       0     0  1      0    11   3976     5 2002 116 15   4  31
      6288     1       0     0  1      0    11   3976     5 2002 116 15   4  31
      6289     1       0     0  1      0    11   3976     5 2002 116 15   4  31
      6290     1       0     0  1      0    11   3976     5 2002 116 15   4  31
>plt.gstar
  SIOSEIS ver 2002.9 (18 Dec. 2002)  (C) Regents of U.C.                         
 procs diskin xstar agc plot end 
 diskin 
    fgmt 1505 lgmt 1507 
     ipath yr2002day116-1456z.segy end 
 end 
 xstar 
   type 0 end 
 end 
 plot 
     nibs 2859 vscale 200 nsecs .02 tlines .005 .01 
     wiggle 0 def .002 trpin 150 srpath sunfil.ras ann gmtint anninc 1 
     end 
 end 
 agc 
    winlen .005 end 
 end 
 end 
 ****    0 ERRORS IN THIS JOB   ****
  ***  WARNING  ***  Uneven spacing between plot samples.
                   Interpolation will be done.
    Use vscale   333.333344 to avoid it.
  The computed PLOT SCALAR is   2.00000017E-08
 Image size is  1504 by  2102
  END OF SIOSEIS RUN




                  1 Trace Xstar (Lizarralde's)
>plt.xstar1
 SIOSEIS ver 2002.9 (20 Dec. 2002)  (C) Regents of U.C.                         
procs diskin xstar plot end 
diskin 
  fgmt 1705 lgmt 1719 ipath l35f1.sgy format edgetech end 
end 
xstar 
    type 1 end 
end 
plot 
    stime 1.4 wiggle 0 ann gmtint anninc 1 
     nibs 2859 vscale 25 nsecs .1 tlines .01 .05 .1 
     def .002 trpin 200 srpath sunfil.ras end 
 end 
 end 
 ****    0 ERRORS IN THIS JOB   ****
  ***  WARNING  ***  Uneven spacing between plot samples.
                   Interpolation will be done.
    Use vscale   33.3333359 to avoid it.
  The computed PLOT SCALAR is   3773837.
 Image size is  1056 by  826
  END OF SIOSEIS RUN




              2 Trace Xstar (Driscoll's)
>more plt
sioseis << eof
procs diskin plot end
diskin
    fno 7233 lno 7240 ipath line2.tr1 end 
    fno 7233 lno 7240 ipath line2.tr2 end 
    fno 7233 lno 7240 ipath line2.segy end 
end 
plot 
   fspace 8 nspace 5 spacei 8 
    stime .07 
    nibs 2859 vscale 25 nsecs .1 tlines .01 .05 .1 
    def .03 ann shotno taginc 1 
    srpath sunfil.ras 
    end 
end 
end 
eof

plot comparing dual ducer traces





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