fmreadsegy.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 [fmseis,line_name,ntr,nrec,xs,ys,xr,yr,offs,...
		selevs,relevs,sdepths,cdps]=fmreadsegy(filename,xopt)

% [fmseis,line_name,ntr,nrec,xs,ys,xr,yr,offs,selevs,relevs,...
%		sdepths,cdps]=fmreadsegy(filename,xopt)
%
% FMREADSEGY reads a disk dataset in "Promax" segy format
%	and returns a fleximat.
%
%	filename ... full file name to read from
%	xopt ... 0 fleximat x coords are trace number
%	         1 fleximat x coords are .5*(xs+xr)
%		 2 fleximat x coords are xs
%		 3 fleximat x coords are xr
%		 val fleximat x coords are val*cdp
%   *********** default = 0 **********
%
%	fmseis ... the fleximat
%	line_name ... line name
%	ntr ...  number of traces per gather in the segy dataset
%	nrec ... number of gathers in the segy dataset
%	xs ... inline source coordinates for each trace in fmseis
%	ys ... crossline source coordinates for each trace in fmseis
%	xr ... inline receiver coordinates for each trace in fmseis
%	yr ... crossline receiver coordinates for each trace in fmseis
%	offs ... s-r offsets for each trace in fmseis
%	selevs ... source elevation for each trace in fmseis
%	relevs ... receiver elevation for each trace in fmseis
%	sdepths ... source depths for each trace in fmseis
%	cdps ... cdp numbers for each trace in fmseis
%
% 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.
%    - reselling the SOFTWARE, or including it or any portion of it, in any
%      software that will be resold is expressly forbidden.
%    - transfering the SOFTWARE in any form to a commercial firm or any 
%      other for-profit organization is expressly forbidden.
%
% END TERMS OF USE LICENSE

if(nargin<2)
	xopt=0;
end

[seis,t,line_name,ntr,nrec,xs,ys,xr,yr,offs,...
	selevs,relevs,sdepths,cdps]=readsegy(filename);

if(xopt==0)
	nx=size(seis,2);
	x=1:nx;
elseif(xopt==1)
	x=.5*(xs+xr);
elseif(xopt==2)
	x=xs;
elseif(xopt==3)
	x=xr;
else
	x=xopt*cdps;
end
fmseis=fmset(fmseis,x,t,seis);