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/rot3c.m
function [dataout]=rot3c(datain,headw1,tstart,tend,comp1,comp2) %rot3c - function to rotate horizontal components for borehole data (DSI etc.) %into radial and transverse components %It is done by performing 1 degree increments in rotation and then checking for the best rotation % %function [dataout]=rot3c(datain,headw1,tstart,tend,comp1,comp2) % %INPUT VARIABLES %'datain' must be in official DSI data format %each record must represent a component x, y, or z in that order %this can be achieved using 'sortrec' % % headw1 = header word containing first break picks % tstart and tend = time interval before and after first breaks in seconds to be analyzed for proper rotation % comp1 = component to be maximized % comp2 = component to be minimized % % Please note: Software does not check for reasonable parameters or dead traces % %DSIsoft ver 2.0 %DSI customized VSP processing software % %by G. Perron (Nov 15th, 1996) %based on rot3c_dirp from S. Guest and D. Eaton+ %Rewritten by Marko Mah February 1999 %$Id: rot3c.m,v 3.0 2000/06/13 19:21:12 gilles Exp $ %$Log: rot3c.m,v $ %Revision 3.0 2000/06/13 19:21:12 gilles %Release 3 % %Revision 2.1 2000/06/13 15:51:30 gilles %*** empty log message *** % %Revision 2.0 1999/05/21 18:46:20 mah %Release 2 % %Revision 1.7 1999/05/19 21:03:02 mah %version number % %Revision 1.6 1999/03/18 19:47:09 mah %made it more flexible by changing tint to tstart and tend % %Revision 1.5 1999/02/22 22:24:26 mah %made it more robust % %Revision 1.4 1999/02/22 20:38:38 mah %speed it up % %Revision 1.3 1999/02/22 20:12:24 mah %changed sign convention in rotation to make in line with current practice % %Revision 1.2 1999/02/22 19:48:27 mah %made program more flexible % %Revision 1.1 1999/02/22 19:16:20 mah %Initial revision % % % %Copyright (C) 1998 Seismology and Electromagnet+ic 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 disp('[dataout]=rot3c(datain,headw1,tstart,tend,comp1,comp2)'); w=pi/180; trclength=datain.fh{7}; %number of points per trace smpint=datain.fh{8}; %smpint is the sampling interval dataout=datain; %check to make sure data is separated into components %ntr is the number of traces in each record for COUNT=3:-1:1 %get number of traces in each component ntr(COUNT)=datain.th{COUNT}(12,1); end %for if (ntr(1)~=ntr(2)) | (ntr(1)~=ntr(3)) error('check data format - different number of traces in components'); end%if if length(datain.dat)~=3 error('data must have only 3 records - one for each of x, y and z'); end %if %************************************************************************* %create a look-up table of sin and cos values for COUNT=0:360 cosang(COUNT+1)=cos(COUNT*w); sinang(COUNT+1)=sin(COUNT*w); end %for COUNT ntr=ntr(1); angmx(1:ntr)=0; %initialize angmx vector for storing rotation angles for COUNT1=1:ntr samp1=round((datain.th{1}(headw1,COUNT1)-datain.fh{9})/smpint)-round(tstart/smpint)+1; %calulates start of interval to be analyzed samp2=round((datain.th{1}(headw1,COUNT1)-datain.fh{9})/smpint)+round(tend/smpint)+1; %calulates end of interval to be analyzed fbsamp=round(datain.th{1}(headw1,COUNT1)/smpint); %this following loops over specified angles and returns the angle within %those specified that maximizes the radial component cmax=0; %initializing the max. energy of a component datawin=samp1:samp2; %the window over which the data is to be analyzed lendatawin=length(datawin); %length of the data window xy=[datain.dat{comp1}(datawin,COUNT1), datain.dat{comp2}(datawin,COUNT1)]; %the window of data to be analyzed rt=zeros(lendatawin,2); for COUNT2=0:90 %checks from 0 to 90 degrees %the following applies the rotation matrix and sums over each component rt(:,1)=xy(:,1)*cosang(COUNT2+1)+xy(:,2)*sinang(COUNT2+1); rt(:,2)=-xy(:,1)*sinang(COUNT2+1)+xy(:,2)*cosang(COUNT2+1); c1rms=sum(rt(:,1).*rt(:,1)); c2rms=sum(rt(:,2).*rt(:,2)); % the following checks to see if either component is being maximized if c1rms > cmax angmx(COUNT1)=COUNT2; cmax=c1rms; end %if if c2rms > cmax angmx(COUNT1)=COUNT2+90; cmax=c2rms; end %if end %for COUNT2 %now that one knows that one component is maximized in the range 0 to 180 degrees %one now checks if there has been a 180 degree phase shift ampmax=zeros(1,2); for COUNT2=1:2 ang=angmx(COUNT1)+(COUNT2-1)*180; %calculates the angle for the current quadrant being checked A=[cosang(ang+1),sinang(ang+1);-sinang(ang+1),cosang(ang+1)]; %rotation matrix % now to determine where the firstbreak is % fbloc=ceil(length(xy)/2); fbloc=fbsamp-samp1; rt=A*xy(fbloc,:)'; %rotates the first break amplitudes ampmax(COUNT2)=rt(1); end %for COUNT2 maxloc=find(ampmax==max(ampmax)); %finds the location of the maximum amplitude of component 1 angmx(COUNT1)=angmx(COUNT1)+(maxloc(1)-1)*180; %sets the angle that maximizes component 1 end %for COUNT1 for COUNT=1:ntr sinangmx=sinang(angmx(COUNT)+1); cosangmx=cosang(angmx(COUNT)+1); for COUNT2=1:trclength data1=datain.dat{comp1}(COUNT2,COUNT); data2=datain.dat{comp2}(COUNT2,COUNT); dataout.dat{comp1}(COUNT2,COUNT)=data1*cosangmx + data2*sinangmx; %radial dataout.dat{comp2}(COUNT2,COUNT)=-data1*sinangmx + data2*cosangmx; %transverse end %loop over samples end %for COUNT %make changes to trace header dataout.th{comp1}(4,:)=dataout.th{comp1}(4,:)+3; dataout.th{comp2}(4,:)=dataout.th{comp2}(4,:)+3; dataout.th{comp1}(5,:)=angmx(:); dataout.th{comp2}(5,:)=angmx(:);