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WriteSegy.m
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WriteSegy.m
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% WriteSegy : writes data to disk using SEGY REV 1 standard.
%
% EX
% WriteSegy('datacube.segy',data,'dt',.004,'Inline3D',Inline,'Crossline3D',Crossline,'cdpX',X,'cdpY',Y);
%
% to use a specific SEG revision use :
% WriteSegy('test.segy',seisdata,'revision',0); % SEG-Y Revision 0
% WriteSegy('test.segy',seisdata,'revision',1); % SEG-Y Revision 1
%
% to use a specific Data Sampling Format use :
% WriteSegy('test.segy',seisdata,'dsf',1); % IBM FLAOTING POINT
%
% Forice Revision 1 and IEEE Floating point :
% WriteSegy('test.segy',seisdata,'dsf',5,'revision',1);
%
% See also : WriteSegyStructure, WriteSu, WriteSuStructure
%
%
% (C) 2001-2007, Thomas Mejer Hansen, tmh@gfy.ku.dk/thomas.mejer.hansen@gmail.com
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% This program 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 General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
%
function WriteSegy(filename,data,varargin);
[ns,ntraces]=size(data);
for i=1:2:length(varargin)
var=varargin{i};
val=varargin{i+1};
eval([var,'=[',num2str(val),'];']);
end
if exist('dt')~=1
dt=0.004;
SegymatVerbose([mfilename,' - No dt set. Using dt=',num2str(dt)],0)
end
%%%%%%%%%%
% SET UP SegyHeader structure.
if exist('TextualFileHeader'), SegyHeader.TextualFileHeader=TextualFileHeader; end
if exist('Job')==1, SegyHeader.Job=Job; end;
if exist('Line')==1, SegyHeader.Line=Line; end
if exist('Reel')==1, SegyHeader.Reel=Reel; end
if exist('DataTracePerEnsemble')==1, SegyHeader.DataTracePerEnsemble=DataTracePerEnsemble; end
if exist('AuxiliaryTracePerEnsemble')==1, SegyHeader.AuxiliaryTracePerEnsemble=AuxiliaryTracePerEnsemble; end
if exist('dt')==1, SegyHeader.dt=dt.*1e+6; end
if exist('dtOrig')==1, SegyHeader.dtOrig=dtOrig; end
if exist('ns')==1, SegyHeader.ns=ns; end
if exist('nsOrig')==1, SegyHeader.nsOrig=nsOrig; end
if exist('EnsembleFold')==1, SegyHeader.EnsembleFold=EnsembleFold; end
if exist('TraceSorting')==1, SegyHeader.TraceSorting=TraceSorting; end
if exist('VerticalSumCode')==1, SegyHeader.VerticalSumCode=VerticalSumCode; end
%%%%%%%%%%
%% CHOOSE WHICH SEGY REVISION AND DATATYPE TO USE
%% DEFAULT IS REVISION 1, 4-byte IEEE
% IF A SPECFIC REVISION HAS BEEN CHOSEN, USE THAT
if exist('revision')==1,
if revision==1,
SegyHeader.SegyFormatRevisionNumber=256;
else
SegyHeader.SegyFormatRevisionNumber=0;
end
SegymatVerbose([mfilename,' : Using user specified SEG Y revision : ',num2str(revision)],1)
end
% IF A SPECFIC DATA SAMPLING FORMAT HAS BEEN SELECTED USE THAT
if exist('dsf')==1,
SegyHeader.DataSampleFormat=dsf;
SegymatVerbose([mfilename,' : Using user specified Data Sample Format : ',num2str(revision)],1)
end
% OPEN SEGY FILE HANDLE
segyid = fopen(filename,'w','b'); % ALL DISK FILES ARE IN BIG
% ENDIAN FORMAT, ACCORDING TO SEG
% Y rev 1
% Write SEGY HEADER
SegyHeader=PutSegyHeader(segyid,SegyHeader);
for i=1:ntraces;
if (i/100)==round(i/100),
SegymatVerbose(['writing trace ',num2str(i),' of ',num2str(ntraces)],0);
end
% Basic TraceHeader information
% INITALIZE SEGY TRACE HEADER
if exist('SegyTraceHeader')==0;
SegyTraceHeader=InitSegyTraceHeader(ns,dt*1e+6);
end
if exist('TraceNumber')==0
SegyTraceHeader.TraceNumber=i;
SegyTraceHeader.TraceSequenceFile=i;
end
% Update TraceHeader information if available
if exist('cdpX')==1,SegyTraceHeader.cdpX = cdpX(i);end
if exist('offset')==1,SegyTraceHeader.offset = offset(i);end
if exist('cdpY')==1,SegyTraceHeader.cdpY = cdpY(i);end
if exist('Inline3D')==1,SegyTraceHeader.Inline3D = Inline3D(i);end
if exist('Crossline3D')==1,SegyTraceHeader.Crossline3D=Crossline3D(i);end
if exist('YearDataRecorded')==1,SegyTraceHeader.YearDataRecorded=YearDataRecorded(i);end
if exist('DayOfYear')==1,SegyTraceHeader.DayOfYear=DayOfYear(i);end
if exist('HourOfDay')==1,SegyTraceHeader.HourOfDay=HourOfDay(i);end
if exist('MinuteOfOur')==1,SegyTraceHeader.MinuteOfOur=MinuteOfOur(i);end
if exist('SecondOfMinute')==1,SegyTraceHeader.SecondOfMinute=SecondOfMinute(i);end
if exist('TimeBaseCode')==1,SegyTraceHeader.TimeBaseCode=TimeBaseCode(i);end
% Write the Trace
PutSegyTrace(segyid,data(:,i),SegyTraceHeader,SegyHeader);
end
% CLOSE SEGY FILE HANDLE
fclose(segyid);