sectconv.m

基于matlab的反演程序,用于地球物理勘探中射线追踪及偏移成像程序.

function sect = sectconv(sect,t,w,tw)

% sectout = sectconv(sectin,t,w,tw)
%
% SECTCONV convolves a wavelet with a seismic section.
%
% sectin ... input section of size nsamp x ntr. That is one trace per
%	column.
% t ... nsamp long time coordinate vector for sectin
% w ... wavlet to be convolved with section
% tw ... time coordinate vector for wavelet. Abort will occur if wavelet
%	and sectin have different time sample rates.
% sectout ... output section of size nsamp x ntr.
%
% G.F. Margrave, CREWES Project, University of Calgary, 1996
%
% NOTE: It is illegal for you to use this software for a purpose other
% than non-profit education or research UNLESS you are employed by a CREWES
% Project sponsor. By using this software, you are agreeing to the terms
% detailed in this software's Matlab source file.
 
% BEGIN TERMS OF USE LICENSE
%
% This SOFTWARE is maintained by the CREWES Project at the Department
% of Geology and Geophysics of the University of Calgary, Calgary,
% Alberta, Canada.  The copyright and ownership is jointly held by 
% its author (identified above) and the CREWES Project.  The CREWES 
% project may be contacted via email at:  [e-mail]
% 
% The term 'SOFTWARE' refers to the Matlab source code, translations to
% any other computer language, or object code
%
% Terms of use of this SOFTWARE
%
% 1) Use of this SOFTWARE by any for-profit commercial organization is
%    expressly forbidden unless said organization is a CREWES Project
%    Sponsor.
%
% 2) A CREWES Project sponsor may use this SOFTWARE under the terms of the 
%    CREWES Project Sponsorship agreement.
%
% 3) A student or employee of a non-profit educational institution may 
%    use this SOFTWARE subject to the following terms and conditions:
%    - this SOFTWARE is for teaching or research purposes only.
%    - this SOFTWARE may be distributed to other students or researchers 
%      provided that these license terms are included.
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%      software that will be resold is expressly forbidden.
%    - transfering the SOFTWARE in any form to a commercial firm or any 
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% END TERMS OF USE LICENSE

[nsamp,ntr]=size(sect);

dt=t(2)-t(1);
dtw=tw(2)-tw(1);
small = 1.e06*eps;
if( abs( dt-dtw ) > small )
	error(' wavelet and section must have same sample rates ');
end
nz=near(tw,0.);
if(abs(tw(nz)) > small)
	disp('WARNING from sectconv: Wavelet has no sample at time zero');
end

for k=1:ntr
	sect(:,k) = convz( sect(:,k),w,nz);
end