70 lines
2.0 KiB
Matlab
70 lines
2.0 KiB
Matlab
function [] = sac2ascii(sac, asciiFilePath)
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%sac2ascii Saves given sac data in ascii file in slist format
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% check required fields
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checkValue(sac.knetwk, 'knetwk');
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checkValue(sac.kstnm, 'kstnm');
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checkValue(sac.kcmpnm, 'kcmpnm');
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checkValue(sac.delta, 'delta');
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checkValue(sac.nzyear, 'nzyear');
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checkValue(sac.nzjday, 'nzjday');
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checkValue(sac.nzhour, 'nzhour');
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checkValue(sac.nzmin, 'nzmin');
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checkValue(sac.sec, 'sec');
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networkCode = sac.knetwk;
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stationCode = sac.kstnm;
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locationCode = sac.khole;
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if isUndefined(locationCode); locationCode = ''; end
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channelCode = sac.kcmpnm;
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frequency = int32(1 / sac.delta);
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unit = extractUnit(sac);
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startTime = extractStartTime(sac);
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samples = length(sac.trace);
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fileID = fopen(asciiFilePath, 'w');
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fprintf(fileID, 'TIMESERIES %s_%s_%s_%s, %d samples, %d sps, %s, SLIST, FLOAT, %s\n',...
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networkCode, stationCode, locationCode, channelCode, samples, frequency, startTime, unit);
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fprintf(fileID, '%f\n', sac.trace);
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fclose(fileID);
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end
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function [unit] = extractUnit(sac)
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switch sac.idep
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case 6
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unit = 'NM';
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case 7
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unit = 'NM/S';
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case 8
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unit = 'NM/S^2';
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otherwise
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unit = 'COUNTS';
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end
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end
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function [startTime] = extractStartTime(sac)
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% converting day of the year to day of the month
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yearString = ['01-01-', num2str(sac.nzyear)];
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date = datenum(yearString, 'dd-mm-yyyy') + sac.nzjday - 1;
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dateString = datestr(date, 'yyyy-mm-dd');
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startTime = sprintf('%sT%02d:%02d:%09.6f', dateString, sac.nzhour, sac.nzmin, sac.sec);
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end
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function [] = checkValue(value, fieldName)
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if isUndefined(value)
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error('sac does not contain required field - [%s]', fieldName);
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end
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end
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function [undefined] = isUndefined(value)
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if isa(value, 'char')
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undefined = strcmp(value, '-12345');
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elseif isa(value, 'logical')
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undefined = value == false;
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else
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undefined = abs(-12345 - value) < 1e-10;
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end
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end
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