Synopsis
		sftahsort < infile.rsf > out.rsf verbose=1 input= headers= sort=

tah is the abbreviation of Trace And Header. Madagascar programs
that begin with sftah are designed to:
1- read trace and headers from separate rsf files and write them to
standard output (ie sftahread)
2- filter programs that read and write standard input/output and
process the tah data (eg sftahnmo, sftahstack)
3- read tah data from standard input and write separate rsf files for
the trace and headers data (ie sftahwrite)

These programs allow Seismic Unix (su) like processing in Madagascar.
Some programs have su like names.

Some programs in this suite are sftahread, sftahgethw, ftahhdrmath,
and sftahwrite.

EXAMPLE:

sftahsort \
verbose=1 \
input=npr3_field.rsf \
sort="iline:100,200,50 +xline:100,140,10 offset" \
| sftahmakeskey pkey=iline,xline skey=cdpt verbose=1 \
| sftahwrite \
verbose=1 \
label2="cdpt" o2=1 n2=50 d2=1 \
label3="xline" o3=100 n3=5 d3=10 \
label4="iline" o4=100 n4=3 d4=50 \
output=mappedfieldsort.rsf \
>/dev/null

sfgrey
In this example the cmp sorted prestack data, npr3_gathers.rsf, are
read by sftahread. The headers are in the file npr3_gathers_hdr.rsf,
the headers parameter default. The headers are merged with the trace
amplitudes and the tah data sent down the pipe for nmo and stack. The
sftahwrite writes the trace data to mappedstack.rsf and the headers
are written to the file mappedstack_hdr.rsf. The order of the data in
the output file is defined by the iline and xline trace headers, so the
data order is (time,xline,iline). Finally, the output volume is
displayed using sfgrey.

Parameters
		string headers= Trace header file name. Default is the input data file name, with the final .rsf changed to _hdr.rsf   string input= Input file for traces amplitudes   string sort= list of the sort keys. Each key must be a trace header key name. It may be preceeded with + (the default) for ascending or - for descending sort direction. The key may be followed with :min,max or :min,max,inc. These parameters allow you to select a subset of of the traces based on the header key. The sort keys are blank seperated you should enclose the sort string in "'s. Examples are sort="iline xline offset" and sort="cdp:100,500,25 offset"   int verbose=1 flag to control amount of print 0 terse, 1 informative, 2 chatty, 3 debug

Used In
		DATA          bpmodel94/firstlook bpstatics94/firstlook bptti2007/firstlook chevron2014/fwi chevron2014/ntg marmousi2mp/modelproc new-zealand-kerry3d/fetch p-cable/ntg p-cable/removeclick p-cable/stack p-cable/veltest seam-phase1-2d/cvs seam-phase1-2d/fetch seam-phase1-2d/ntg seam-phase1-2d/vscan stratton/fetchbooklet stratton/fetchgather teapotdome/angmig teapotdome/canoren teapotdome/cmp_stack_tahstack teapotdome/fetch teapotdome/firstlook teapotdome/nmostack teapotdome/scdecon teapotdome/tahnmostack teapotdome/tahscplot teapotdome/tahscscale teapotdome/tahsubset teapotdome/teamodel teapotdome/test-preprocessing teapotdome/vels teapotdome/zomig viking/basicm8r viking/decon viking/firstlook