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PutSegyHeader.m
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% PutSegyHeader : Writes SEG-Y header to disk.
% PutSegyHeader(segyid,SegyHeader)
%
% (C) 2001-2016, Thomas Mejer Hansen, 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 SegyHeader=PutSegyHeader(segyid,SegyHeader);
NA=0;
if isfield(SegyHeader,'Rev')==0
SegyHeader.Rev=GetSegyHeaderBasics;
end
if (isfield(SegyHeader,'DataSampleFormat')==0)&(isfield(SegyHeader,'SegyFormatRevisionNumber')==0)
SegyHeader.DataSampleFormat=5; % '5'->4-byte IEEE floating point
SegyHeader.SegyFormatRevisionNumber=256;
SegymatVerbose([mfilename,' : Using datasample format : ',SegyHeader.Rev(2).DataSampleFormat(SegyHeader.DataSampleFormat).name],1)
PrintSegyFormatRevsisionNumber(SegyHeader,1);
end
% SET Revsion number. Always use revision 1, if not otherwise specified.
if (isfield(SegyHeader,'SegyFormatRevisionNumber')==0)
SegyHeader.SegyFormatRevisionNumber=256;
PrintSegyFormatRevsisionNumber(SegyHeader,1);
end
% SET DATA SAMPLE FORMAT IF NOT SPECIFIED
% Rev0->IBM FLOATING POINT
% Rev1->IEEE FLOATING POINT
if (isfield(SegyHeader,'DataSampleFormat')==0)
if SegyHeader.SegyFormatRevisionNumber==0
SegyHeader.DataSampleFormat=1; % '1'->IBM floating point
SegymatVerbose([mfilename,' : Using datasample format : ',SegyHeader.Rev(1).DataSampleFormat(SegyHeader.DataSampleFormat).name],1)
else
SegyHeader.DataSampleFormat=5; % '5'->4-byte IEEE floating point
SegymatVerbose([mfilename,' : Using datasample format : ',SegyHeader.Rev(2).DataSampleFormat(SegyHeader.DataSampleFormat).name],1)
end
end
if isfield(SegyHeader,'TextualFileHeader')
% MAKE SURE LENGTH IF Text.. is 3200
if length(SegyHeader.TextualFileHeader)<3200
dummyTXT=SegyHeader.TextualFileHeader;
SegyHeader.TextualFileHeader=zeros(3200,0);
SegyHeader.TextualFileHeader(1:length(dummyTXT))=dummyTXT;
end
else
SegyHeader.TextualFileHeader=sprintf('%3200s','SEGY READER (tmh@gfy.ku.dk)');
end
if ~isfield(SegyHeader,'Job'), SegyHeader.Job=NA; end
if ~isfield(SegyHeader,'Line'), SegyHeader.Line=NA; end
if ~isfield(SegyHeader,'Reel'), SegyHeader.Reel=NA; end
if ~isfield(SegyHeader,'DataTracePerEnsemble'), SegyHeader.DataTracePerEnsemble=NA;end
if ~isfield(SegyHeader,'AuxiliaryTracePerEnsemble'), SegyHeader.AuxiliaryTracePerEnsemble=0;end
if ~isfield(SegyHeader,'dt'), SegyHeader.dt=4000; end
if ~isfield(SegyHeader,'dtOrig'), SegyHeader.dtOrig=NA; end
if ~isfield(SegyHeader,'ns'), SegyHeader.ns=NA; end
if ~isfield(SegyHeader,'nsOrig'), SegyHeader.nsOrig=NA; end
if ~isfield(SegyHeader,'DataSampleFormat'), SegyHeader.DataSampleFormat=5; end % '5'->4-byte IEEE floating point
if ~isfield(SegyHeader,'EnsembleFold'), SegyHeader.EnsembleFold=NA; end
if ~isfield(SegyHeader,'TraceSorting'), SegyHeader.TraceSorting=NA; end
if ~isfield(SegyHeader,'VerticalSumCode'), SegyHeader.VerticalSumCode=NA; end
if ~isfield(SegyHeader,'SweepFrequencyStart');SegyHeader.SweepFrequencyStart=NA; end
if ~isfield(SegyHeader,'SweepFrequencyEnd');SegyHeader.SweepFrequencyEnd=NA; end
if ~isfield(SegyHeader,'SweepLength');SegyHeader.SweepLength=NA; end
if ~isfield(SegyHeader,'SweepType');SegyHeader.SweepType=NA; end
if ~isfield(SegyHeader,'SweepChannel');SegyHeader.SweepChannel=NA; end
if ~isfield(SegyHeader,'SweepTaperlengthStart');SegyHeader.SweepTaperlengthStart=NA; end
if ~isfield(SegyHeader,'SweepTaperLengthEnd');SegyHeader.SweepTaperLengthEnd=NA; end
if ~isfield(SegyHeader,'TaperType');SegyHeader.TaperType=NA; end
if ~isfield(SegyHeader,'CorrelatedDataTraces');SegyHeader.CorrelatedDataTraces=NA; end
if ~isfield(SegyHeader,'BinaryGain');SegyHeader.BinaryGain=NA; end
if ~isfield(SegyHeader,'AmplitudeRecoveryMethod');SegyHeader.AmplitudeRecoveryMethod=NA; end
if ~isfield(SegyHeader,'MeasurementSystem');SegyHeader.MeasurementSystem=1; end %1-Meters, 2-Feet
if ~isfield(SegyHeader,'ImpulseSignalPolarity');SegyHeader.ImpulseSignalPolarity=NA; end
if ~isfield(SegyHeader,'VibratoryPolarityCode');SegyHeader.VibratoryPolarityCode=NA; end
% 3261-3500 UNASSIGNED
if ~isfield(SegyHeader,'Unassigned1');SegyHeader.Unassigned1=NA*ones(1,120); end
if ~isfield(SegyHeader,'FixedLengthTraceFlag');SegyHeader.FixedLengthTraceFlag=1; end % ALL TRACES HAVE THE SAME dt AND ns
if ~isfield(SegyHeader,'NumberOfExtTextualHeaders'); SegyHeader.NumberOfExtTextualHeaders=0; end % WE DO NOT YET USE TEXTURAL HEADERS as can be done according to draft 6
% 3506-3600 UNASSIGNED
if ~isfield(SegyHeader,'Unassigned2');SegyHeader.Unassigned2=NA*ones(1,47); end
% IF EXTENDED TEXTUAL FILE HEADERS EXISTS THEN WRITE THEM TO DISK
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% WRITE TO DISK
%
fseek(segyid,0,'bof');
fwrite(segyid,SegyHeader.TextualFileHeader(1:3200),'uchar'); % 1-3200
fwrite(segyid,SegyHeader.Job,'int32'); % 3204
fwrite(segyid,SegyHeader.Line,'int32'); % 3208
fwrite(segyid,SegyHeader.Reel,'int32'); % 3212
fwrite(segyid,SegyHeader.DataTracePerEnsemble,'int16'); % 3214
fwrite(segyid,SegyHeader.AuxiliaryTracePerEnsemble,'int16'); % 3216
fwrite(segyid,SegyHeader.dt,'uint16'); % 3218
fwrite(segyid,SegyHeader.dtOrig,'uint16'); % 3220
fwrite(segyid,SegyHeader.ns,'uint16'); % 3222
fwrite(segyid,SegyHeader.nsOrig,'uint16'); % 3224
fwrite(segyid,SegyHeader.DataSampleFormat,'int16'); % 3226
fwrite(segyid,SegyHeader.EnsembleFold,'int16');
fwrite(segyid,SegyHeader.TraceSorting,'int16'); % 3228
fwrite(segyid,SegyHeader.VerticalSumCode,'int16'); % 3230
fwrite(segyid,SegyHeader.SweepFrequencyStart,'int16'); % 3232
fwrite(segyid,SegyHeader.SweepFrequencyEnd,'int16'); % 3234
fwrite(segyid,SegyHeader.SweepLength,'int16'); % 3236
fwrite(segyid,SegyHeader.SweepType,'int16'); % 3238
fwrite(segyid,SegyHeader.SweepChannel,'int16'); % 3240
fwrite(segyid,SegyHeader.SweepTaperlengthStart,'int16'); % 3242
fwrite(segyid,SegyHeader.SweepTaperLengthEnd,'int16'); % 3244
fwrite(segyid,SegyHeader.TaperType,'int16'); % 3246
fwrite(segyid,SegyHeader.CorrelatedDataTraces,'int16'); % 3248
fwrite(segyid,SegyHeader.BinaryGain,'int16'); % 3250
fwrite(segyid,SegyHeader.AmplitudeRecoveryMethod,'int16'); % 3252
fwrite(segyid,SegyHeader.MeasurementSystem,'int16'); % 3254
fwrite(segyid,SegyHeader.ImpulseSignalPolarity,'int16'); % 3256
fwrite(segyid,SegyHeader.VibratoryPolarityCode,'int16'); % 3258
% 3261-3500 UNASSIGNED1 => (120 int32 = 240 bytes)
fwrite(segyid,SegyHeader.Unassigned1,'int16'); % 3260
%SegymatVerbose(ftell(segyid),10);
%fseek(segyid,3500,'bof');
fwrite(segyid,SegyHeader.SegyFormatRevisionNumber,'uint16'); % 3500
fwrite(segyid,SegyHeader.FixedLengthTraceFlag,'int16'); % 3502
fwrite(segyid,SegyHeader.NumberOfExtTextualHeaders,'uint16'); % 3504
% 3506-3600 UNASSIGNED2 => 94/2=47 int16
fwrite(segyid,SegyHeader.Unassigned2,'int16'); % 3506
%
%
%
if SegyHeader.NumberOfExtTextualHeaders>0
n=SegyHeader.NumberOfExtTextualHeaders;
SegymatVerbose(sprintf('Writing %d Extended Textual File Headers',n));
if isfield(SegyHeader,'ExtTextualHeader')
% MAKE SURE LENGTH IF Text.. is 3200*n
if length(SegyHeader.ExtTextualHeader)<(3200*n)
dummyTXT=SegyHeader.ExtTextualHeader;
SegyHeader.ExtTextualHeader=zeros(n*3200,0);
SegyHeader.ExtTextualHeader(1:length(dummyTXT))=dummyTXT;
end
else
SegyHeader.ExtTextualHeader=sprintf('%3200s','SEGY READER (tmh@gfy.ku.dk)');
for i=2:n,
SegyHeader.ExtTextualHeader=[SegyHeader.ExtTextualHeader,sprintf('%3200s','SEGY READER (tmh@gfy.ku.dk)')];
end
end
% WRITE TEXTUAL FILE HEADER
fwrite(segyid,SegyHeader.ExtTextualHeader(1:(n*3200)),'uchar'); % 1:(n*3200)
end
Revision=SegyHeader.SegyFormatRevisionNumber;
if Revision>0, Revision=1; end
Format=SegyHeader.Rev(Revision+1).DataSampleFormat(SegyHeader.DataSampleFormat).name;
SegymatVerbose([mfilename,' - SegyRevision ',sprintf('%0.4g',Revision),', ',Format],2)