/* ---------------------------------------------------------------------- */ /* StandardSegyDefs.h */ /* ---------------------------------------------------------------------- */ /* */ /* (c) Copyright 2002, 2005 EdgeTech, */ /* */ /* This file contains proprietary information, and trade secrets of */ /* EdgeTech, and may not be disclosed or reproduced without the prior */ /* written consent of EdgeTech. */ /* */ /* EdgeTech is not responsible for the consequences of the use or misuse */ /* of this software, even if they result from defects in it. */ /* */ /* Standard SEG-Y file format. */ /* ---------------------------------------------------------------------- */ #ifndef STANDARDSEGYDEFS_H__ #define STANDARDSEGYDEFS_H__ /* ---------------------------------------------------------------------- */ /* This file contains the EdgeTech header for writing standard SEG-Y */ /* files. Those fields relevant to sonar data collection are filled with */ /* the most reasonable available value. Most fields are left blank or */ /* set to zero. For detailed information see SEG-Y rev 1 Data Exchange */ /* format, release 1.0 available from the Society of Exploration */ /* Geophysicist. */ /* ---------------------------------------------------------------------- */ /* ---------------------------------------------------------------------- */ /* A SEG-Y format file consists of a single text header of 3200 bytes, */ /* this is followed by a single 400 byte binary header. Next comes a */ /* succession of 240 byte trace header / sonar data packets. */ /* ---------------------------------------------------------------------- */ /* ---------------------------------------------------------------------- */ /* SEG-Y Text (ASCII / EBCDIC) header */ /* ---------------------------------------------------------------------- */ typedef struct { unsigned char textHeader[40][80]; } SegyTextHeaderType; /* ---------------------------------------------------------------------- */ /* SEG-Y binary header */ /* ---------------------------------------------------------------------- */ typedef struct { /* Offset : Description */ /* 0 - 3 : job identification number Unused set to 0 */ long jobNum; /* 4 - 7 : line number always set to 1 */ long lineNum; /* 8 - 11 : reel number always set to 1 */ long reelNum; /* 13 - 14 : number of data traces always set to 1 */ short tracesPerRecord; /* 14 - 15 : number of auxillary data traces Unused set to 0 */ short auxTracesPerRecord; /* 16 - 17 : sample interval in microseconds */ /* set to current value, may change at later traces */ short sampleIntervalus; /* 18 - 19 : sample interval in mircroseconds */ /* set to current value, may change at later traces */ short sampleIntervalusOriginal; /* 20 - 21 : number of samples per trace */ /* set to current value, may change at later traces */ short samplesPerTrace; /* 22 - 23 : number of samples per trace */ /* set to current value, may change at later traces */ short samplesPerTraceOriginal; /* 24 - 25 : data sample format code */ /* 1 - 4 byte IBM floating point values , 5 - 4 byte IEEE */ /* floating point values */ short format; /* 26 - 27 : ensemble fold always set to 1 */ short cpdFold; /* 28 - 29 : trace sorting code always set to 1 */ short traceSortCode; /* 30 - 31 : vertical sum code always set to 1 */ short verticalSumCode; /* 32 - 33 : sweep frequency at start in Hertz */ /* set to current value, may change at later traces */ short sweepFreq0; /* 34 - 35 : sweep frequency at end in Hertz */ /* set to current value, may change at later traces */ short sweepFreq1; /* 36 - 37 : sweep length in milliseconds */ /* set to current value, may change at later traces */ short sweepLengthms; /* 38 - 39 : sweep type code 1 - linear always set to 1 */ short sweepType; /* 40 - 41 : trace number of sweep channel Unused set to 0 */ short traceNumofSweep; /* 42 - 43 : sweep trace taper length in milliseconds Unused set to 0 */ short sweepTaperStart; /* 44 - 45 : sweep trace taper length in milliseconds Unused set to 0 */ short sweepTaperEnd; /* 46 - 47 : taper type Unused set to 0 */ short taperCode; /* 48 - 49 : correlated data traces Unused set to 0 */ short correlated; /* 50 - 51 : binary gain recovered Unused set to 0 */ short binaryGainRecovered; /* 52 - 53 : amplitude recovery method Unused set to 0 */ short amplitudeMethod; /* 54 - 55 : measurement system 1 - meters always set to 1 */ short measurementSystem; /* 56 - 57 : impulse signal polarity Unused set to 0 */ short impulsePolarity; /* 58 - 59 : vibratory polarity code Unused set to 0 */ short vibPolarCode; /* 60 - 399 : unassigned set to 0 */ char unassigned[340]; } SegyBinaryHeaderType; /* ---------------------------------------------------------------------- */ /* SEG-Y trace header */ /* ---------------------------------------------------------------------- */ typedef struct { /* Offset : Description */ /* 0 - 3 : trace sequence within line */ long lineSeq; /* 4 - 7 : trace sequence within file */ long reelSeq; /* 8 - 11 : original field record number or trigger number */ long event_number; /* 12 - 15 : trace channel number within the original field record */ long channel_number; /* 16 - 19 : energy source point number Unused set to 0 */ long energySourcePt; /* 20 - 23 : ensemble number Unused set to 0 */ long cdpEns; /* 24 - 27 : trace number within ensemble Unused set to 0 */ long traceInEnsemble; /* 28 - 29 : Trace identification code: seismic data = 1 */ short traceID; /* 30 - 31 : number of vertically summed traces always set to 1 */ short vertSum; /* 32 - 33 : number of horizontally stacked traces always set to 1 */ short horSum; /* 34 - 35 : data use always set to 1 */ short dataUse; /* 36 - 39 : distance from center source to receiver Unused set to 0 */ long sourceToRecDist; /* 40 - 43 : receiver group elevation Unused set to 0 */ long recElevation; /* 44 - 47 : source surface elevation Unused set to 0 */ long sourceSurfaceElevation; /* 48 - 51 : source depth below surface Unused set to 0 */ long sourceDepth; /* 52 - 55 : datum elevation at receiver Unused set to 0 */ long datumElevRec; /* 56 - 59 : datum elevation at source Unused set to 0 */ long datumElevSource; /* 60 - 63 : water depth at source Unused set to 0 */ long sourceWaterDepth; /* 64 - 67 : water depth at group Unused set to 0 */ long recWaterDepth; /* 68 - 69 : Elevation Scaler: + multiplier, - divider */ short elevationScale; /* 70 - 71 : Coordinate Scaler: + multiplier, - divider */ short coordScale; /* 72 - 75 : longitude or X */ long sourceLongOrX; /* 76 - 79 : latitude or Y */ long sourceLatOrY; /* 80 - 83 : longitude or X */ long recLongOrX; /* 84 - 87 : latitude or Y */ long recLatOrY; /* 88 - 89 : Coordinate Units: = 2 seconds of arc, 1 meters */ short coordUnits; /* 90 - 91 : weathering velocity Unused set to 0 */ short weatheringVelocity; /* 92 - 93 : subweathering velocity Unused set to 0 */ short subWeatheringVelocity; /* 94 - 95 : uphole time at source Unused set to 0 */ short sourceUpholeTime; /* 96 - 97 : uphole time at group Unused set to 0 */ short recUpholeTime; /* 98 - 99 : source static correction Unused set to 0 */ short sourceStaticCor; /* 100 - 101 : receiver static correction Unused set to 0 */ short recStaticCor; /* 102 - 103 : total static correction Unused set to 0 */ short totalStatic; /* 104 - 105 : lag time A Unused set to 0 */ short lagTimeA; /* 106 - 107 : lag time B Unused set to 0 */ short lagTimeB; /* 108 - 109 : delay recording time in ms */ short delay; /* 110 - 111 : mute time start in ms Unused set to 0 */ short muteStart; /* 112 - 113 : mute time end in ms Unused set to 0 */ short muteEnd; /* 114 - 115 : Number of samples in this trace (unless == 32767) */ short sampleLength; /* 116 - 117 : Sampling interval in microseconds (unless == 1) */ short deltaSample; /* 118 - 119 : Gain Type: 1 = Fixed Gain */ short gainType; /* 120 - 121 : instrument gain constant */ short gainConst; /* 122 - 123 : instrument initial gain Unused set to 0 */ short initialGain; /* 124 - 125 : correlated 1 - no always set to 1 */ short correlated; /* 126 - 127 : sweep frequency at start */ short sweepStart; /* 128 - 129 : sweep frequency at end */ short sweepEnd; /* 130 - 131 : sweep length in milliseconds */ short sweepLength; /* 132 - 133 : sweep type 1 - linear always set to 1 */ short sweepType; /* 134 - 135 : sweep trace taper length at start Unused set to 0 */ short sweepTaperAtStart; /* 136 - 137 : sweep trace taper length at end Unused set to 0 */ short sweepTaperAtEnd; /* 138 - 139 : taper type Unused set to 0 */ short taperType; /* 140 - 141 : alias filter frequency in Hz */ short aliasFreq; /* 142 - 143 : alias filter slope dB / octave Unused set to 0 */ short aliasSlope; /* 144 - 145 : notch filter frequency in Hz Unused set to 0 */ short notchFreq; /* 146 - 147 : notch filter slope dB / octave Unused set to 0 */ short notchSlope; /* 148 - 149 : low cut frequency in Hz Unused set to 0 */ short lowCutFreq; /* 150 - 151 : high cut frequency in Hz Unused set to 0 */ short hiCutFreq; /* 152 - 153 : low cut slope dB / octave Unused set to 0 */ short lowCutSlope; /* 154 - 155 : high cut slope dB / octave Unused set to 0 */ short hiCutSlope; /* 156 - 157 : year data recorded */ short year; /* 158 - 158 : day of year (julian day) */ short day; /* 160 - 161 : hour of day (24 hour clock) */ short hour; /* 162 - 163 : minute of hour */ short minute; /* 164 - 165 : second of minute */ short second; /* 166 - 167 : Time basis code: 4 = UTC */ short timeBasisCode; /* 168 - 169 : trace weighting factor Unused set to 0 */ short traceWeightingFactor; /* 170 - 171 : geophone group number of roll switch 1 Unused set to 0 */ short phoneRollPos1; /* 172 - 173 : geophone group number of trace 1 Unused set to 0 */ short phoneFirstTrace; /* 174 - 175 : geophone group number of last trace Unused set to 0 */ short phoneLastTrace; /* 176 - 177 : gap size Unused set to 0 */ short gapSize; /* 178 - 179 : over travel with taper Unused set to 0 */ short taperOvertravel; /* 180 - 183 : X coordinate of ensemble position Unused set to 0 */ long ensembleX; /* 184 - 187 : Y coordinate of ensemble position Unused set to 0 */ long ensembleY; /* 188 - 191 : in-line number Unused set to 0 */ long inLineNumber; /* 192 - 195 : cross-line number Unused set to 0 */ long crossLineNumber; /* 196 - 199 : shotpoint number Unused set to 0 */ long shotpointNumber; /* 200 - 201 : shotpoint scaler, + multiplier,- divider Unused set to 0 */ short shotpointScaler; /* 202 - 203 : trace value measurement untis Unused set to 0 */ short traceValueUnits; /* 204 - 207 : transduction constant mantissa Unused set to 0 */ long transductionConstantMantissa; /* 208 - 209 : transduction constant exponent Unused set to 0 */ short transductionConstantExponent; /* 210 - 211 : transduction units Unused set to 0 */ short transductionUnits; /* 212 - 213 : device/trace identifier Unused set to 0 */ short deviceTraceId; /* 214 - 215 : trace time scaler,+ multiplier,- divider Unused set to 0 */ short traceTimeScaler; /* 216 - 217 : source type/orientation Unused set to 0 */ short sourceTypeOrientation; /* 216 - 217 : source energy direction Unused set to 0 */ char sourceEnergyDirection[6]; /* 224 - 227 : source measurement mantissa Unused set to 0 */ long sourceMeasurementMantissa; /* 228 - 229 : source measurement exponent Unused set to 0 */ short sourceMeasurementExponent; /* 230 - 231 : source measurement units Unused set to 0 */ short sourceMeasurementUnits; /* 232 - 239 : unassigned, for optional information */ /* 232 - 233 : mark number */ short markNumber; /* 234 - 239 : unassigned area set to 0 */ char unassigned[6]; } SegyStandardType; /* ---------------------------------------------------------------------- */ /* end of segy trace header */ /* ---------------------------------------------------------------------- */ #endif /* STANDARDSEGYDEFS_H__ */ /* ---------------------------------------------------------------------- */ /* end StandardSegyDefs.cpp */ /* ---------------------------------------------------------------------- */