gusucode.com > DSISoft是由加拿大地质调查局发布的用于垂直地震剖面(VSP)数据处理的免费软件包 > dsisoftv3/dsisoftv3/dsisoftv3/main/s2r_geom.m
function dataout=s2r_geom(datain) %function dataout=s2r_geom(datain) % %This program computes the shot-to-receiver azimuth angle %and puts the corresponding angle (in degrees) in header word 9 %It also computes the shot-to-receiver offset (m) and puts the results %in header word 53 % %This function implies that header words 29,31,33,35,37,39 %are set before being used % %DSIsoft ver 2.0 %DSI customized VSP processing software % %written by Gervais Perron January 25th, 1999 %$Id: s2r_geom.m,v 3.0 2000/06/13 19:21:19 gilles Exp $ %$Log: s2r_geom.m,v $ %Revision 3.0 2000/06/13 19:21:19 gilles %Release 3 % %Revision 2.0 1999/05/21 18:46:27 mah %Release 2 % %Revision 1.4 1999/05/19 21:06:28 mah %end of file problem % %Revision 1.3 1999/05/19 21:05:13 mah %end of file problem % %Revision 1.2 1999/05/19 21:04:03 mah %version number % %Revision 1.1 1999/01/25 19:32:07 perron %Initial revision % %Copyright (C) 1998 Seismology and Electromagnetic Section/ %Continental Geosciences Division/Geological Survey of Canada % %This library is free software; you can redistribute it and/or %modify it under the terms of the GNU Library General Public %License as published by the Free Software Foundation; either %version 2 of the License, or (at your option) any later version. % %This library is distributed in the hope that it will be useful, %but WITHOUT ANY WARRANTY; without even the implied warranty of %MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU %Library General Public License for more details. % %You should have received a copy of the GNU Library General Public %License along with this library; if not, write to the %Free Software Foundation, Inc., 59 Temple Place - Suite 330, %Boston, MA 02111-1307, USA. % %DSI Consortium %Continental Geosciences Division %Geological Survey of Canada %615 Booth St. %Ottawa, Ontario %K1A 0E9 % %email: dsi@cg.nrcan.gc.ca %echo of function call disp('function dataout=s2r_geom(datain);') %initializing output variable dataout=datain; %looping over records in datain for i=1:datain.fh{12} %looping over traces in datain for j=1:datain.th{i}(12,1) %computing distances between shots and receivers for each dimension diffn=datain.th{i}(35,j)-datain.th{i}(29,j); diffe=datain.th{i}(37,j)-datain.th{i}(31,j); diffz=datain.th{i}(39,j)-datain.th{i}(33,j); %computing shot-to-receiver offset dataout.th{i}(53,j)=sqrt(diffe.^2+diffn.^2+diffz.^2); %if statements for computing shot to receiver azimuth %depending on the different quadrants %quadrant 1 (north-east) if diffn>=0 & diffe>=0 a=atan(diffn/diffe); azdeg(j)=90-(a*180/pi); %quadrant 2 (south-east) elseif diffn<=0 & diffe>=0 a=atan(diffn/diffe); azdeg(j)=90+abs(a*180/pi); %quadrant 3 (south-west) elseif diffn<=0 & diffe<=0 a=atan(diffn/diffe); azdeg(j)=180+90-(a*180/pi); %quadrant 4 (north-west) elseif diffn>=0 & diffe<=0 a=atan(diffn/diffe); azdeg(j)=180+90+abs(a*180/pi); end end %assigning shot to receiver azimuth in trace headers dataout.th{i}(9,:)=azdeg; end