Go to the list of seismic processes.
Go to SIOSEIS introduction.
This example is how to read an SEG-Y disk file where the shot
numbers are not monotonically increasing. e.g.
>lsd data 10
SHOT TR RP TR ID RANGE DELAY NSAMPS SI YR DAY HR MIN SEC
15426 1 91829 0 1 -6169 3000 501 2000 99 77 11 22 11
15306 1 91118 0 1 -6169 3000 501 2000 99 77 10 49 36
15366 1 91473 0 1 -6169 3000 501 2000 99 77 11 5 39
15246 1 90763 0 1 -6169 3000 501 2000 99 77 10 33 39
DISKIN will change input files whenever IPATH is different in
successive fno/lno lists. These data are in one file and DISKIN
needs to go backwards in the disk file to find the correct order.
The Unix ln (link) command can make diskin think the data are in two
files and diskin always starts searching a new file from the beginning.
e.g. ln -s data data1 links data1 to file data and SIOSEIS thinks
they are different because they have different names.
A script to order the data is:
sioseis << eof
procs diskin prout end
diskin
allno no
fno 15246 lno 15246 ftr 1 ltr 1 ipath data end
fno 15306 lno 15306 ftr 1 ltr 1 ipath data1 end
fno 15366 lno 15366 ftr 1 ltr 1 ipath data end
fno 15426 lno 15426 ftr 1 ltr 1 ipath data1 end
end
prout
fno 0 lno 99999 ftr 0 ltr 9999 end
end
end