tah is the abbreviation of Trace And Header. Madagascar programs
that begin with sftah are a 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,
The sftahremoveclick program removes electrical noise clicks. This noise has
the same shape and same time on each trace, but the amplitude varies on each trace. The noise is create by electrical interference.
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 sftahgethw. Electrical clicks are moved from the data.
Traces are sent to STDOUT, which is directed to
/dev/null (the bit bucket).
strings key= no default
list of header keys print. Look at the sfsegyread for a list
of header names.
flag to control amount of print
0 terse, 1 informative, 2 chatty, 3 debug