SYNOPSIS
PERL PROGRAM NAME:
AUTHOR: Juan Lorenzo (Perl module only)
DATE:
DESCRIPTION:
Version:
USE
NOTES
Examples
SYNOPSIS
SEISMIC UNIX NOTES SUDMOTX - DMO via T-X domain (Kirchhoff) method for common-offset gathers
sudmotx <stdin >stdout cdpmin= cdpmax= dxcdp= noffmix= [optional parms]
Required Parameters:
cdpmin= minimum cdp (integer number) for which to apply DMO
cdpmax= maximum cdp (integer number) for which to apply DMO
dxcdp= distance between successive cdps
noffmix= number of offsets to mix (see notes)
Optional Parameters:
offmax=3000.0 maximum offset
tmute=2.0 mute time at maximum offset offmax
vrms=1500.0 RMS velocity at mute time tmute
verbose=0 =1 for diagnostic print
tmpdir= if non-empty, use the value as a directory path prefix
for storing temporary files; else if the CWP_TMPDIR
environment variable is set use its value for the path;
else use tmpfile()
Notes:
Input traces should be sorted into common-offset gathers. One common-
offset gather ends and another begins when the offset field of the trace
headers changes.
The cdp field of the input trace headers must be the cdp bin NUMBER, NOT
the cdp location expressed in units of meters or feet.
The number of offsets to mix (noffmix) should typically equal the ratio of
the shotpoint spacing to the cdp spacing. This choice ensures that every
cdp will be represented in each offset mix. Traces in each mix will
contribute through DMO to other traces in adjacent cdps within that mix.
The defaults for offmax and vrms are appropriate only for metric units.
If distances are measured in feet, then these parameters should be
specified explicitly.
offmax, tmute, and vrms need not be specified precisely.
If these values are unknown, then one should overestimate offmax
and underestimate tmute and vrms.
No muting is actually performed. The tmute parameter is used only to
determine parameters required to perform DMO.
Credits:
CWP: Dave Hale
Technical Reference:
A non-aliased integral method for dip-moveout
Dave Hale
submitted to Geophysics, June, 1990
Trace header fields accessed: ns, dt, delrt, offset, cdp.User'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 cdpmax
sub cdpmin
sub dxcdp
sub noffmix
sub offmax
sub tmpdir
sub tmute
sub verbose
sub vrms
sub get_max_index
max index = number of input variables -1