00001 /* Copyright (c) Colorado School of Mines, 2006.*/ 00002 /* All rights reserved. */ 00003 00004 00005 /* segy.h - include file for SEGY traces 00006 * 00007 * declarations for: 00008 * typedef struct {} segy - the trace identification header 00009 * typedef struct {} bhed - binary header 00010 * 00011 * Note: 00012 * If header words are added, run the makefile in this directory 00013 * to recreate hdr.h. 00014 * 00015 * Reference: 00016 * K. M. Barry, D. A. Cavers and C. W. Kneale, "Special Report: 00017 * Recommended Standards for Digital Tape Formats", 00018 * Geophysics, vol. 40, no. 2 (April 1975), P. 344-352. 00019 * 00020 * $Author: john $ 00021 * $Source: /usr/local/cwp/src/su/include/RCS/segy.h,v $ 00022 * $Revision: 1.26 $ ; $Date: 2005/01/21 20:18:45 $ 00023 */ 00024 00025 #ifndef SEGY_H 00026 #define SEGY_H 00027 00028 #define SU_NFLTS 32768 /* Arbitrary limit on data array size */ 00029 00030 00031 /* TYPEDEFS */ 00032 typedef struct s_segy { /* segy - trace identification header */ 00033 00034 int tracl; /* Trace sequence number within line 00035 --numbers continue to increase if the 00036 same line continues across multiple 00037 SEG Y files. 00038 */ 00039 00040 int tracr; /* Trace sequence number within SEG Y file 00041 ---each file starts with trace sequence 00042 one 00043 */ 00044 00045 int fldr; /* Original field record number */ 00046 00047 int tracf; /* Trace number within original field record */ 00048 00049 int ep; /* energy source point number 00050 ---Used when more than one record occurs 00051 at the same effective surface location. 00052 */ 00053 00054 int cdp; /* Ensemble number (i.e. CDP, CMP, CRP,...) */ 00055 00056 int cdpt; /* trace number within the ensemble 00057 ---each ensemble starts with trace number one. 00058 */ 00059 00060 short trid; /* trace identification code: 00061 -1 = Other 00062 0 = Unknown 00063 1 = Seismic data 00064 2 = Dead 00065 3 = Dummy 00066 4 = Time break 00067 5 = Uphole 00068 6 = Sweep 00069 7 = Timing 00070 8 = Water break 00071 9 = Near-field gun signature 00072 10 = Far-field gun signature 00073 11 = Seismic pressure sensor 00074 12 = Multicomponent seismic sensor 00075 - Vertical component 00076 13 = Multicomponent seismic sensor 00077 - Cross-line component 00078 14 = Multicomponent seismic sensor 00079 - in-line component 00080 15 = Rotated multicomponent seismic sensor 00081 - Vertical component 00082 16 = Rotated multicomponent seismic sensor 00083 - Transverse component 00084 17 = Rotated multicomponent seismic sensor 00085 - Radial component 00086 18 = Vibrator reaction mass 00087 19 = Vibrator baseplate 00088 20 = Vibrator estimated ground force 00089 21 = Vibrator reference 00090 22 = Time-velocity pairs 00091 23 ... N = optional use 00092 (maximum N = 32,767) 00093 00094 Following are CWP id flags: 00095 00096 109 = autocorrelation 00097 110 = Fourier transformed - no packing 00098 xr[0],xi[0], ..., xr[N-1],xi[N-1] 00099 111 = Fourier transformed - unpacked Nyquist 00100 xr[0],xi[0],...,xr[N/2],xi[N/2] 00101 112 = Fourier transformed - packed Nyquist 00102 even N: 00103 xr[0],xr[N/2],xr[1],xi[1], ..., 00104 xr[N/2 -1],xi[N/2 -1] 00105 (note the exceptional second entry) 00106 odd N: 00107 xr[0],xr[(N-1)/2],xr[1],xi[1], ..., 00108 xr[(N-1)/2 -1],xi[(N-1)/2 -1],xi[(N-1)/2] 00109 (note the exceptional second & last entries) 00110 113 = Complex signal in the time domain 00111 xr[0],xi[0], ..., xr[N-1],xi[N-1] 00112 114 = Fourier transformed - amplitude/phase 00113 a[0],p[0], ..., a[N-1],p[N-1] 00114 115 = Complex time signal - amplitude/phase 00115 a[0],p[0], ..., a[N-1],p[N-1] 00116 116 = Real part of complex trace from 0 to Nyquist 00117 117 = Imag part of complex trace from 0 to Nyquist 00118 118 = Amplitude of complex trace from 0 to Nyquist 00119 119 = Phase of complex trace from 0 to Nyquist 00120 121 = Wavenumber time domain (k-t) 00121 122 = Wavenumber frequency (k-omega) 00122 123 = Envelope of the complex time trace 00123 124 = Phase of the complex time trace 00124 125 = Frequency of the complex time trace 00125 130 = Depth-Range (z-x) traces 00126 143 = Seismic Data, Vertical Component 00127 144 = Seismic Data, Horizontal Component 1 00128 145 = Seismic Data, Horizontal Component 2 00129 146 = Seismic Data, Radial Component 00130 147 = Seismic Data, Transverse Component 00131 201 = Seismic data packed to bytes (by supack1) 00132 202 = Seismic data packed to 2 bytes (by supack2) 00133 */ 00134 00135 short nvs; /* Number of vertically summed traces yielding 00136 this trace. (1 is one trace, 00137 2 is two summed traces, etc.) 00138 */ 00139 00140 short nhs; /* Number of horizontally summed traces yielding 00141 this trace. (1 is one trace 00142 2 is two summed traces, etc.) 00143 */ 00144 00145 short duse; /* Data use: 00146 1 = Production 00147 2 = Test 00148 */ 00149 00150 int offset; /* Distance from the center of the source point 00151 to the center of the receiver group 00152 (negative if opposite to direction in which 00153 the line was shot). 00154 */ 00155 00156 int gelev; /* Receiver group elevation from sea level 00157 (all elevations above the Vertical datum are 00158 positive and below are negative). 00159 */ 00160 00161 int selev; /* Surface elevation at source. */ 00162 00163 int sdepth; /* Source depth below surface (a positive number). */ 00164 00165 int gdel; /* Datum elevation at receiver group. */ 00166 00167 int sdel; /* Datum elevation at source. */ 00168 00169 int swdep; /* Water depth at source. */ 00170 00171 int gwdep; /* Water depth at receiver group. */ 00172 00173 short scalel; /* Scalar to be applied to the previous 7 entries 00174 to give the real value. 00175 Scalar = 1, +10, +100, +1000, +10000. 00176 If positive, scalar is used as a multiplier, 00177 if negative, scalar is used as a divisor. 00178 */ 00179 00180 short scalco; /* Scalar to be applied to the next 4 entries 00181 to give the real value. 00182 Scalar = 1, +10, +100, +1000, +10000. 00183 If positive, scalar is used as a multiplier, 00184 if negative, scalar is used as a divisor. 00185 */ 00186 00187 int sx; /* Source coordinate - X */ 00188 00189 int sy; /* Source coordinate - Y */ 00190 00191 int gx; /* Group coordinate - X */ 00192 00193 int gy; /* Group coordinate - Y */ 00194 00195 short counit; /* Coordinate units: (for previous 4 entries and 00196 for the 7 entries before scalel) 00197 1 = Length (meters or feet) 00198 2 = Seconds of arc 00199 3 = Decimal degrees 00200 4 = Degrees, minutes, seconds (DMS) 00201 00202 In case 2, the X values are longitude and 00203 the Y values are latitude, a positive value designates 00204 the number of seconds east of Greenwich 00205 or north of the equator 00206 00207 In case 4, to encode +-DDDMMSS 00208 counit = +-DDD*10^4 + MM*10^2 + SS, 00209 with scalco = 1. To encode +-DDDMMSS.ss 00210 counit = +-DDD*10^6 + MM*10^4 + SS*10^2 00211 with scalco = -100. 00212 */ 00213 00214 short wevel; /* Weathering velocity. */ 00215 00216 short swevel; /* Subweathering velocity. */ 00217 00218 short sut; /* Uphole time at source in milliseconds. */ 00219 00220 short gut; /* Uphole time at receiver group in milliseconds. */ 00221 00222 short sstat; /* Source static correction in milliseconds. */ 00223 00224 short gstat; /* Group static correction in milliseconds.*/ 00225 00226 short tstat; /* Total static applied in milliseconds. 00227 (Zero if no static has been applied.) 00228 */ 00229 00230 short laga; /* Lag time A, time in ms between end of 240- 00231 byte trace identification header and time 00232 break, positive if time break occurs after 00233 end of header, time break is defined as 00234 the initiation pulse which maybe recorded 00235 on an auxiliary trace or as otherwise 00236 specified by the recording system */ 00237 00238 short lagb; /* lag time B, time in ms between the time break 00239 and the initiation time of the energy source, 00240 may be positive or negative */ 00241 00242 short delrt; /* delay recording time, time in ms between 00243 initiation time of energy source and time 00244 when recording of data samples begins 00245 (for deep water work if recording does not 00246 start at zero time) */ 00247 00248 short muts; /* mute time--start */ 00249 00250 short mute; /* mute time--end */ 00251 00252 unsigned short ns; /* number of samples in this trace */ 00253 00254 unsigned short dt; /* sample interval; in micro-seconds */ 00255 00256 short gain; /* gain type of field instruments code: 00257 1 = fixed 00258 2 = binary 00259 3 = floating point 00260 4 ---- N = optional use */ 00261 00262 short igc; /* instrument gain constant */ 00263 00264 short igi; /* instrument early or initial gain */ 00265 00266 short corr; /* correlated: 00267 1 = no 00268 2 = yes */ 00269 00270 short sfs; /* sweep frequency at start */ 00271 00272 short sfe; /* sweep frequency at end */ 00273 00274 short slen; /* sweep length in ms */ 00275 00276 short styp; /* sweep type code: 00277 1 = linear 00278 2 = cos-squared 00279 3 = other */ 00280 00281 short stas; /* sweep trace length at start in ms */ 00282 00283 short stae; /* sweep trace length at end in ms */ 00284 00285 short tatyp; /* taper type: 1=linear, 2=cos^2, 3=other */ 00286 00287 short afilf; /* alias filter frequency if used */ 00288 00289 short afils; /* alias filter slope */ 00290 00291 short nofilf; /* notch filter frequency if used */ 00292 00293 short nofils; /* notch filter slope */ 00294 00295 short lcf; /* low cut frequency if used */ 00296 00297 short hcf; /* high cut frequncy if used */ 00298 00299 short lcs; /* low cut slope */ 00300 00301 short hcs; /* high cut slope */ 00302 00303 short year; /* year data recorded */ 00304 00305 short day; /* day of year */ 00306 00307 short hour; /* hour of day (24 hour clock) */ 00308 00309 short minute; /* minute of hour */ 00310 00311 short sec; /* second of minute */ 00312 00313 short timbas; /* time basis code: 00314 1 = local 00315 2 = GMT 00316 3 = other */ 00317 00318 short trwf; /* trace weighting factor, defined as 1/2^N 00319 volts for the least sigificant bit */ 00320 00321 short grnors; /* geophone group number of roll switch 00322 position one */ 00323 00324 short grnofr; /* geophone group number of trace one within 00325 original field record */ 00326 00327 short grnlof; /* geophone group number of last trace within 00328 original field record */ 00329 00330 short gaps; /* gap size (total number of groups dropped) */ 00331 00332 short otrav; /* overtravel taper code: 00333 1 = down (or behind) 00334 2 = up (or ahead) */ 00335 00336 #ifdef UNOCAL_SEGY_H /* begin Unocal SU segy.h differences */ 00337 00338 00339 /* cwp local assignments */ 00340 float d1; /* sample spacing for non-seismic data */ 00341 00342 float f1; /* first sample location for non-seismic data */ 00343 00344 float d2; /* sample spacing between traces */ 00345 00346 float f2; /* first trace location */ 00347 00348 float ungpow; /* negative of power used for dynamic 00349 range compression */ 00350 00351 float unscale; /* reciprocal of scaling factor to normalize 00352 range */ 00353 00354 short mark; /* mark selected traces */ 00355 00356 /* UNOCAL local assignments */ 00357 short mutb; /* mute time at bottom (start time) */ 00358 /* bottom mute ends at last sample */ 00359 float dz; /* depth sampling interval in (m or ft) */ 00360 /* if =0.0, input are time samples */ 00361 00362 float fz; /* depth of first sample in (m or ft) */ 00363 00364 short n2; /* number of traces per cdp or per shot */ 00365 00366 short shortpad; /* alignment padding */ 00367 00368 int ntr; /* number of traces */ 00369 00370 /* UNOCAL local assignments end */ 00371 00372 short unass[8]; /* unassigned */ 00373 00374 #else 00375 00376 /* cwp local assignments */ 00377 float d1; /* sample spacing for non-seismic data */ 00378 00379 float f1; /* first sample location for non-seismic data */ 00380 00381 float d2; /* sample spacing between traces */ 00382 00383 float f2; /* first trace location */ 00384 00385 float ungpow; /* negative of power used for dynamic 00386 range compression */ 00387 00388 float unscale; /* reciprocal of scaling factor to normalize 00389 range */ 00390 00391 int ntr; /* number of traces */ 00392 00393 short mark; /* mark selected traces */ 00394 00395 short shortpad; /* alignment padding */ 00396 00397 00398 short unass[14]; /* unassigned--NOTE: last entry causes 00399 a break in the word alignment, if we REALLY 00400 want to maintain 240 bytes, the following 00401 entry should be an odd number of short/UINT2 00402 OR do the insertion above the "mark" keyword 00403 entry */ 00404 #endif 00405 00406 float data[SU_NFLTS]; 00407 00408 } segy; 00409 00410 00411 typedef struct s_bhed { /* bhed - binary header */ 00412 00413 int jobid; /* job identification number */ 00414 00415 int lino; /* line number (only one line per reel) */ 00416 00417 int reno; /* reel number */ 00418 00419 short ntrpr; /* number of data traces per record */ 00420 00421 short nart; /* number of auxiliary traces per record */ 00422 00423 unsigned short hdt; /* sample interval in micro secs for this reel */ 00424 00425 unsigned short dto; /* same for original field recording */ 00426 00427 unsigned short hns; /* number of samples per trace for this reel */ 00428 00429 unsigned short nso; /* same for original field recording */ 00430 00431 short format; /* data sample format code: 00432 1 = floating point (4 bytes) 00433 2 = fixed point (4 bytes) 00434 3 = fixed point (2 bytes) 00435 4 = fixed point w/gain code (4 bytes) */ 00436 00437 short fold; /* CDP fold expected per CDP ensemble */ 00438 00439 short tsort; /* trace sorting code: 00440 1 = as recorded (no sorting) 00441 2 = CDP ensemble 00442 3 = single fold continuous profile 00443 4 = horizontally stacked */ 00444 00445 short vscode; /* vertical sum code: 00446 1 = no sum 00447 2 = two sum ... 00448 N = N sum (N = 32,767) */ 00449 00450 short hsfs; /* sweep frequency at start */ 00451 00452 short hsfe; /* sweep frequency at end */ 00453 00454 short hslen; /* sweep length (ms) */ 00455 00456 short hstyp; /* sweep type code: 00457 1 = linear 00458 2 = parabolic 00459 3 = exponential 00460 4 = other */ 00461 00462 short schn; /* trace number of sweep channel */ 00463 00464 short hstas; /* sweep trace taper length at start if 00465 tapered (the taper starts at zero time 00466 and is effective for this length) */ 00467 00468 short hstae; /* sweep trace taper length at end (the ending 00469 taper starts at sweep length minus the taper 00470 length at end) */ 00471 00472 short htatyp; /* sweep trace taper type code: 00473 1 = linear 00474 2 = cos-squared 00475 3 = other */ 00476 00477 short hcorr; /* correlated data traces code: 00478 1 = no 00479 2 = yes */ 00480 00481 short bgrcv; /* binary gain recovered code: 00482 1 = yes 00483 2 = no */ 00484 00485 short rcvm; /* amplitude recovery method code: 00486 1 = none 00487 2 = spherical divergence 00488 3 = AGC 00489 4 = other */ 00490 00491 short mfeet; /* measurement system code: 00492 1 = meters 00493 2 = feet */ 00494 00495 short polyt; /* impulse signal polarity code: 00496 1 = increase in pressure or upward 00497 geophone case movement gives 00498 negative number on tape 00499 2 = increase in pressure or upward 00500 geophone case movement gives 00501 positive number on tape */ 00502 00503 short vpol; /* vibratory polarity code: 00504 code seismic signal lags pilot by 00505 1 337.5 to 22.5 degrees 00506 2 22.5 to 67.5 degrees 00507 3 67.5 to 112.5 degrees 00508 4 112.5 to 157.5 degrees 00509 5 157.5 to 202.5 degrees 00510 6 202.5 to 247.5 degrees 00511 7 247.5 to 292.5 degrees 00512 8 293.5 to 337.5 degrees */ 00513 00514 short hunass[170]; /* unassigned */ 00515 00516 } bhed; 00517 00518 /* DEFINES */ 00519 #define gettr(x) fgettr(stdin, (x)) 00520 #define vgettr(x) fvgettr(stdin, (x)) 00521 #define puttr(x) fputtr(stdout, (x)) 00522 #define vputtr(x) fvputtr(stdout, (x)) 00523 #define gettra(x, y) fgettra(stdin, (x), (y)) 00524 00525 00526 /* TREAL represents real time traces */ 00527 #define TREAL 1 00528 /* TDEAD represents dead time traces */ 00529 #define TDEAD 2 00530 /* TDUMMY represents dummy time traces */ 00531 #define TDUMMY 3 00532 /* TBREAK represents time break traces */ 00533 #define TBREAK 4 00534 /* UPHOLE represents uphole traces */ 00535 #define UPHOLE 5 00536 /* SWEEP represents sweep traces */ 00537 #define SWEEP 6 00538 /* TIMING represents timing traces */ 00539 #define TIMING 7 00540 /* WBREAK represents timing traces */ 00541 #define WBREAK 8 00542 /* NFGUNSIG represents near field gun signature */ 00543 #define NFGUNSIG 9 00544 /* FFGUNSIG represents far field gun signature */ 00545 #define FFGUNSIG 10 00546 /* SPSENSOR represents seismic pressure sensor */ 00547 #define SPSENSOR 11 00548 /* TVERT represents multicomponent seismic sensor 00549 - vertical component */ 00550 #define TVERT 12 00551 /* TXLIN represents multicomponent seismic sensor 00552 - cross-line component */ 00553 #define TXLIN 13 00554 /* TINLIN represents multicomponent seismic sensor 00555 - in-line component */ 00556 #define TINLIN 14 00557 /* ROTVERT represents rotated multicomponent seismic sensor 00558 - vertical component */ 00559 #define ROTVERT 15 00560 /* TTRANS represents rotated multicomponent seismic sensor 00561 - transverse component */ 00562 #define TTRANS 16 00563 /* TRADIAL represents rotated multicomponent seismic sensor 00564 - radial component */ 00565 #define TRADIAL 17 00566 /* VRMASS represents vibrator reaction mass */ 00567 #define VRMASS 18 00568 /* VBASS represents vibrator baseplate */ 00569 #define VBASS 19 00570 /* VEGF represents vibrator estimated ground force */ 00571 #define VEGF 20 00572 /* VREF represents vibrator reference */ 00573 #define VREF 21 00574 00575 /*** CWP trid assignments ***/ 00576 /* ACOR represents autocorrelation */ 00577 #define ACOR 109 00578 /* FCMPLX represents fourier transformed - no packing 00579 xr[0],xi[0], ..., xr[N-1],xi[N-1] */ 00580 #define FCMPLX 110 00581 /* FUNPACKNYQ represents fourier transformed - unpacked Nyquist 00582 xr[0],xi[0],...,xr[N/2],xi[N/2] */ 00583 #define FUNPACKNYQ 111 00584 /* FTPACK represents fourier transformed - packed Nyquist 00585 even N: xr[0],xr[N/2],xr[1],xi[1], ..., 00586 xr[N/2 -1],xi[N/2 -1] 00587 (note the exceptional second entry) 00588 odd N: 00589 xr[0],xr[(N-1)/2],xr[1],xi[1], ..., 00590 xr[(N-1)/2 -1],xi[(N-1)/2 -1],xi[(N-1)/2] 00591 (note the exceptional second & last entries) 00592 */ 00593 #define FTPACK 112 00594 /* TCMPLX represents complex time traces */ 00595 #define TCMPLX 113 00596 /* FAMPH represents freq domain data in amplitude/phase form */ 00597 #define FAMPH 114 00598 /* TAMPH represents time domain data in amplitude/phase form */ 00599 #define TAMPH 115 00600 /* REALPART represents the real part of a trace to Nyquist */ 00601 #define REALPART 116 00602 /* IMAGPART represents the real part of a trace to Nyquist */ 00603 #define IMAGPART 117 00604 /* AMPLITUDE represents the amplitude of a trace to Nyquist */ 00605 #define AMPLITUDE 118 00606 /* PHASE represents the phase of a trace to Nyquist */ 00607 #define PHASE 119 00608 /* KT represents wavenumber-time domain data */ 00609 #define KT 121 00610 /* KOMEGA represents wavenumber-frequency domain data */ 00611 #define KOMEGA 122 00612 /* ENVELOPE represents the envelope of the complex time trace */ 00613 #define ENVELOPE 123 00614 /* INSTPHASE represents the phase of the complex time trace */ 00615 #define INSTPHASE 124 00616 /* INSTFREQ represents the frequency of the complex time trace */ 00617 #define INSTFREQ 125 00618 /* DEPTH represents traces in depth-range (z-x) */ 00619 #define TRID_DEPTH 130 00620 /* 3C data... v,h1,h2=(11,12,13)+32 so a bitmask will convert */ 00621 /* between conventions */ 00622 /* CHARPACK represents byte packed seismic data from supack1 */ 00623 #define CHARPACK 201 00624 /* SHORTPACK represents 2 byte packed seismic data from supack2 */ 00625 #define SHORTPACK 202 00626 00627 /* #define ISSEISMIC(id) (( (id)==0 || (id)==TREAL || (id)==TDEAD || (id)==TDUMMY ) ? cwp_true : cwp_false ) */ 00628 #define ISSEISMIC(id) (( (id)==0 || (id)==TREAL || (id)==TDEAD || (id)==TDUMMY || \ 00629 (id)==TVERT || (id)==TXLIN || (id)==TINLIN || \ 00630 (id)==TRADIAL || (id)==TTRANS ) ? cwp_true : cwp_false ) 00631 00632 /* FUNCTION PROTOTYPES */ 00633 #ifdef __cplusplus /* if C++, specify external linkage to C functions */ 00634 extern "C" { 00635 #endif 00636 00637 int fgettr(FILE *fp, segy *tp); 00638 int fvgettr(FILE *fp, segy *tp); 00639 void fputtr(FILE *fp, segy *tp); 00640 void fvputtr(FILE *fp, segy *tp); 00641 int fgettra(FILE *fp, segy *tp, int itr); 00642 00643 /* hdrpkge */ 00644 void gethval(const segy *tp, int index, Value *valp); 00645 void puthval(segy *tp, int index, Value *valp); 00646 void getbhval(const bhed *bhp, int index, Value *valp); 00647 void putbhval(bhed *bhp, int index, Value *valp); 00648 void gethdval(const segy *tp, char *key, Value *valp); 00649 void puthdval(segy *tp, char *key, Value *valp); 00650 char *hdtype(const char *key); 00651 char *getkey(const int index); 00652 int getindex(const char *key); 00653 void swaphval(segy *tp, int index); 00654 void swapbhval(bhed *bhp, int index); 00655 void printheader(const segy *tp); 00656 00657 void tabplot(segy *tp, int itmin, int itmax); 00658 00659 #ifdef __cplusplus /* if C++, end external linkage specification */ 00660 } 00661 #endif 00662 00663 #endif
1.4.7