SYNOPSIS
PERL PROGRAM NAME:
AUTHOR: Juan Lorenzo (Perl module only)
DATE:
DESCRIPTION:
Version:
USE
NOTES
Examples
SYNOPSIS
SEISMIC UNIX NOTES SUMIGSPLIT - Split-step depth migration for zero-offset data.
sumigsplit <infile >outfile vfile= [optional parameters]
Required Parameters:
nz= number of depth sapmles
dz= depth sampling interval
vfile= name of file containing velocities
Optional Parameters:
dt=from header(dt) or .004 time sampling interval
dx=from header(d2) or 1.0 midpoint sampling interval
ft=0.0 first time sample
fz= first depth sample
tmpdir= if non-empty, use the value as a directory path
prefix for storing temporary files; else if the
the CWP_TMPDIR environment variable is set use
its value for the path; else use tmpfile()
Notes:
The input velocity file \'vfile\' consists of C-style binary floats.
The structure of this file is vfile[iz][ix]. Note that this means that
the x-direction is the fastest direction instead of z-direction! Such a
structure is more convenient for the downward continuation type
migration algorithm than using z as fastest dimension as in other SU
programs.
Because most of the tools in the SU package (such as unif2, unisam2,
and makevel) produce output with the structure vfile[ix][iz], you will
need to transpose the velocity files created by these programs. You may
use the SU program \'transp\' in SU to transpose such files into the
required vfile[iz][ix] structure.
(In C v[iz][ix] denotes a v(x,z) array, whereas v[ix][iz]
denotes a v(z,x) array, the opposite of what Matlab and Fortran
programmers may expect.) ",
Credits: CWP Baoniu Han, July 21th, 1997
Reference:
Stoffa, P. L. and Fokkema, J. T. and Freire, R. M. and Kessinger, W. P.,
1990, Split-step Fourier migration, Geophysics, 55, 410-421.
Trace header fields accessed: ns, dt, delrt, d2
Trace header fields modified: ns, dt, 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 dx
sub dz
sub ft
sub fz
sub nz
sub tmpdir
sub vfile
sub get_max_index
max index = number of input variables -1