closetrace.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 ind = closetrace(xxx,yyy,xw,yw,rd) 

% function ind = closetrace(xxx,yyy,xw,yw,rd) 
%
% function linewelltie(action) 
%  finds closest trace (point) in line to given well location (xw,yw)
%  (as long as the trace is within a radius rd)
%  line defined by points xxx(i),yyy(i)
%  returns index of closest trace 
%  returns null if no trace is close enough
%
%  T.N.Bishop,  December 1993, CPTC Canada
%   see also seis2well, linewelltie
%
% 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 
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% any other computer language, or object code
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% Terms of use of this SOFTWARE
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% END TERMS OF USE LICENSE


%  FIND WELL TO SEISMIC MATCHES THAT ARE WITHIN RADIUS

    ind = [];

    dclose = closeline(xxx,yyy,xw,yw);

    if dclose <= rd
      d=sqrt( (xxx-xw).^2 + (yyy-yw).^2 );
      dmin = min(d);
      if dmin <= rd
        ind = find(d == dmin);
      end
    end