SYNOPSIS
PERL PROGRAM NAME:
AUTHOR: Juan Lorenzo (Perl module only)
DATE:
DESCRIPTION:
Version:
USE
NOTES
Examples
SYNOPSIS
SEISMIC UNIX NOTES SUSHIFT - shifted/windowed traces in time
sushift <stdin >stdout [tmin= ] [tmax= ]
tmin= min time to pass
tmax= max time to pass
dt= sample rate in microseconds
fill=0.0 value to place in padded samples
(defaults for tmin and tmax are calculated from the first trace.
verbose= 1 echos parameters to stdout
Background :
tmin and tmax must be given in seconds
In the high resolution single channel seismic profiling the sample
interval is short, the shot rate and the number of samples are high.
To reduce the file size the delrt time is changed during a profiling
trip. To process and display a seismic section a constant delrt is
needed. This program does this job.
The SEG-Y header variable delrt (delay in ms) is a short integer.
That's why in the example shown below delrt is rounded to 123 !
... | sushift tmin=0.1234 tmax=0.2234 | ...
The dt= and fill= options are intended for manipulating velocity
volumes in trace format. In particular models which were hung
from the water bottom when created & which then need to have the
water layer added.
Author:
Toralf Foerster
Institut fuer Ostseeforschung Warnemuende
Sektion Marine Geologie
Seestrasse 15
D-18119 Rostock, Germany
Trace header fields accessed: ns, delrt
Trace header fields modified: ns, delrtUser's notes (Juan Lorenzo) untested
CHANGES and their DATES
Import packages
instantiation of packages
Encapsulated hash of private variables
sub Step
collects switches and assembles bash instructions by adding the program name
sub note
collects switches and assembles bash instructions by adding the program name
sub clear
sub dt
sub fill
sub tmax
sub tmin
sub verbose
sub get_max_index
max index = number of input variables -1