topsin.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 [linet1,linet2]=topsin(lasheader)
%
% [linet1,linet2]=topsin(lasheader)
%
% linet1 is the line in the lasheader with the first top
% linet2 is the line in the lasheader with the last top
%
% 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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  [nlines,nchar]=size(lasheader);
%
% search for TOPS 
%
  linet1=-1;
  for line=1:nlines
	  str = lasheader(line,:);
	  if(strcmp(str(2:5),'TOPS'))
	    linet1=line+1;
	  end
  end
  if(linet1 ~= -1)   %found some TOPS
    line=linet1-1;
    str='yyy';
    while ( (strcmp(str(1),'~') == 0) & (strcmp(str(1),'#') == 0) )
     	  line=line+1;
	  str = lasheader(line,:);
    end
    linet2=line-1;    %last top
  else     %no TOPS found, so return location of ~Curve Info
	   % for both l1 and l2
    for line=1:nlines
	  str = lasheader(line,:);
	  if(strcmp(str(1:9),'~Curve In'))
	    linet1=line;
	    linet2=line-1;
	  end
    end
  end
  if(linet1 == -1)
    linet1=1;
    linet2=0;
  end