/* ---------------------------------------------------------------------- */ /* SegyDefs.h */ /* ---------------------------------------------------------------------- */ /* */ /* (c) Copyright 1997, 1998, 2000 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. */ /* */ /* ---------------------------------------------------------------------- */ /* */ /* EdgeTech SEG-Y subbottom data format description. */ /* */ /* ---------------------------------------------------------------------- */ #ifndef __SEGYDEFS_H__ #define __SEGYDEFS_H__ /* ---------------------------------------------------------------------- */ /* Values for trigger type field */ /* ---------------------------------------------------------------------- */ typedef enum { TRIGGER_INTERNAL, /* Internal trigger (0) */ TRIGGER_EXTERNAL, /* External trigger (1) */ } TriggerSourceType; /* ---------------------------------------------------------------------- */ /* Each record of data has a 240 byte header, the content of which is */ /* defined below. The structure is intended to be compatible with most */ /* implemented SEG-Y formats, as well as the original standard. */ /* */ /* Unused fields should be set to 0 */ /* */ /* SEG-Y defined fields (** -> Highly Recommended in SEG-Y) */ /* ---------------------------------------------------------------------- */ typedef struct { /* 0-3 : Trace Sequence Number (always 0) ** */ long int sequenceNumber; /* 4-7 : Starting depth (window offset) in samples. */ unsigned long int startDepth; /* 8-11: Ping number (increments with ping) ** */ unsigned long int pingNum; /* 12-15 : Channel Number (0 .. n) ** */ unsigned long int channelNum; /* 16-27 */ short int unused1[6]; /* 28-29 : ID Code (always 1 => seismic data) ** */ short int traceIDCode; /* 30-33 */ short int unused2[2]; /* 34-35 : DataFormatType */ /* 0 = 1 short per sample - envelope data */ /* 1 = 2 shorts per sample, - stored as real(1), imag(1), */ /* 2 = 1 short per sample - before matched filter */ /* 3 = 1 short per sample - real part analytic signal */ /* 4 = 1 short per sample - pixel data / ceros data */ short int dataFormat; /* 36-37 : Distance from towfish to antennae in cm */ short int NMEAantennaeR; /* 38-39 : Distance to antennae starboard direction in cm */ short int NMEAantennaeO; /* 40-71 : Reserved for RS232 data - TBD */ char RS232[32]; /* -------------------------------------------------------------------- */ /* Navigation data : */ /* If the coorUnits are seconds(2), the x values represent longitude */ /* and the y values represent latitude. A positive value designates */ /* the number of seconds east of Greenwich Meridian or north of the */ /* equator. */ /* -------------------------------------------------------------------- */ /* 72-75 : Meters or Seconds of Arc */ long int sourceCoordX; /* 76-79 : Meters or Seconds of Arc */ long int sourceCoordY; /* 80-83 : mm or 10000 * (Minutes of Arc) */ long int groupCoordX; /* 84-87 : mm or 10000 * (Minutes of Arc) */ long int groupCoordY; /* 88-89 : Units of coordinates - 1->length (x /y), 2->seconds of arc */ short int coordUnits; /* 90-113 : Annotation string */ char annotation[24]; /* 114-115 : Samples in this packet ** */ /* Note: Large sample sizes require multiple packets. */ unsigned short int samples; /* 116-119 : Sample interval in ns of stored data ** */ unsigned long int sampleInterval; /* 120-121 : Gain factor of ADC */ unsigned short int ADCGain; /* 122-123 : user pulse power setting (0 - 100) percent */ short int pulsePower; /* 124-125 : correlated data 1 - No, 2 - Yes */ short int correlated; /* 126-127 : Starting frequency in 10 * Hz */ unsigned short int startFreq; /* 128-129 : Ending frequency in 10 * Hz */ unsigned short int endFreq; /* 130-131 : Sweep length in ms */ unsigned short int sweepLength; /* 132-139 */ short int unused7[4]; /* 140-141 : alias Frequency (sample frequency / 2) */ unsigned short int aliasFreq; /* 142-143 : Unique pulse identifier */ unsigned short int pulseID; /* 144-155 */ short int unused8[6]; /* 156-157 : Year data recorded (CPU time) */ short int year; /* 158-159 : day */ short int day; /* 160-161 : hour */ short int hour; /* 162-163 : minute */ short int minute; /* 164-165 : second */ short int second; /* 166-167 : Always 3 (other not specified by standard) */ short int timeBasis; /* 168-169 : weighting factor for block floating point expansion */ /* -- defined as 2 -N volts for lsb */ short int weightingFactor; /* 170-171 : */ short int unused9; /* -------------------------------------------------------------------- */ /* From pitch/roll/temp/heading sensor */ /* -------------------------------------------------------------------- */ /* 172-173 : Compass heading (100 * degrees) -180.00 to 180.00 degrees */ short int heading; /* 174-175 : Pitch */ short int pitch; /* 176-177 : Roll */ short int roll; /* 178-179 : Temperature (10 * degrees C) */ short int temperature; /* -------------------------------------------------------------------- */ /* User defined area from 180-239 */ /* -------------------------------------------------------------------- */ /* 180-181 : Heave compensation offset (samples) */ short int heaveCompensation; /* 182-183 : TriggerSource (0 = internal, 1 = external) */ short int trigSource; /* 184-185 : Mark Number (0 = no mark) */ unsigned short int markNumber; /* 186-187 : Hour */ short int NMEAHour; /* 188-189 : Minutes */ short int NMEAMinutes; /* 190-191 : Seconds */ short int NMEASeconds; /* 192-193 : Course */ short int NMEACourse; /* 194-195 : Speed */ short int NMEASpeed; /* 196-197 : Day */ short int NMEADay; /* 198-199 : Year */ short int NMEAYear; /* 200-203 : Millieconds today */ unsigned long int millisecondsToday; /* 204-205 : Maximum absolute value for ADC samples for this packet */ unsigned short int ADCMax; /* 206-207 : System constant in tenths of a dB */ short int calConst; /* 208-209 : Vehicle ID */ short int vehicleID; /* 210-215 : Software version number */ char softwareVersion[6]; /* Following items are not in X-Star */ /* 216-219 : Initial spherical correction factor (useful for multiping /*/ /* deep application) * 100 */ long int sphericalCorrection; /* 220-221 : Packet number (1 - N) (Each ping starts with packet 1) */ unsigned short int packetNum; /* 222-223 : A/D decimation before FFT */ short int ADCDecimation; /* 224-225 : Decimation factor after FFT */ short int decimation; /* 226-239 */ short int unuseda[7]; /* -------------------------------------------------------------------- */ /* Data area begins here */ /* -------------------------------------------------------------------- */ /* Data begins at byte 240, has this.samples points in it */ /* short int data[]; */ /* -------------------------------------------------------------------- */ } SegyDataType; /* ---------------------------------------------------------------------- */ #endif /* end Not __SEGYDEFS_H__ */ /* ---------------------------------------------------------------------- */ /* end SegyDefs.h */ /* ---------------------------------------------------------------------- */