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Joeri Brackenhoff authoredJoeri Brackenhoff authored
HomG.c 28.09 KiB
#include "par.h"
#include "segy.h"
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <assert.h>
#include <genfft.h>
#ifndef MAX
#define MAX(x,y) ((x) > (y) ? (x) : (y))
#endif
#ifndef MIN
#define MIN(x,y) ((x) < (y) ? (x) : (y))
#endif
#define NINT(x) ((int)((x)>0.0?(x)+0.5:(x)-0.5))
#ifndef COMPLEX
typedef struct _complexStruct { /* complex number */
float r,i;
} complex;
#endif/* complex */
int getFileInfo(char *filename, int *n1, int *n2, int *ngath, float *d1, float *d2, float *f1, float *f2, float *xmin, float *xmax, float *sclsxgx, int *nxm);
int disp_fileinfo(char *file, int n1, int n2, float f1, float f2, float d1, float d2, segy *hdrs);
double wallclock_time(void);
int writeData(FILE *fp, float *data, segy *hdrs, int n1, int n2);
int readSnapData(char *filename, float *data, segy *hdr, int ngath, int nx, int ntfft, int sx, int ex, int sz, int ez);
int topdet(float *data, int nt);
void conjugate(float *data, int nsam, int nrec, float dt);
void scl_data(float *data, int nsam, int nrec, float scl, float *datout, int nsamout);
void pad_data(float *data, int nsam, int nrec, int nsamout, float *datout);
void convol(float *data1, float *data2, float *con, int nrec, int nsam, float dt, int shift);
void corr(float *data1, float *data2, float *cov, int nrec, int nsam, float dt, int shift);
void timeShift(float *data, int nsam, int nrec, float dt, float shift, float fmin, float fmax);
void timeDiff(float *data, int nsam, int nrec, float dt, float fmin, float fmax, int opt);
void depthDiff(float *data, int nsam, int nrec, float dt, float dx, float fmin, float fmax, float c, int opt);
void pad2d_data(float *data, int nsam, int nrec, int nsamout, int nrecout, float *datout);
char *sdoc[] = {
" ",
" HomG - Calculate a Homogeneous Green's function ",
" ",
" authors : Joeri Brackenhoff (J.A.Brackenhoff@tudelft.nl)",
" : Jan Thorbecke (janth@xs4all.nl)",
" ",
" Required parameters: ",
"",
" file_in= ................. First file of the array of receivers",
" file_shot= ............... File containing the shot location",
" ",
" Optional parameters: ",
" ",
" file_out= ................ Filename of the output",
" numb= .................... integer number of first snapshot file",
" dnumb= ................... integer number of increment in snapshot files",
" zmax= .................... Integer number of maximum depth level",
" inx= ..................... Number of sources per depth level",
" zrcv= .................... z-coordinate of first receiver location",
" xrcv= .................... x-coordinate of first receiver location",
" dzrcv= ................... z-spacing of receivers",
" dxrcv= ................... x-spacing of receivers",
" shift=0.0 ................ shift per shot",
" scheme=0 ................. Scheme used for retrieval. 0=Marchenko,",
" 1=Marchenko with multiple sources, 2=classical",
NULL};
int main (int argc, char **argv)
{ FILE *fp_in, *fp_shot, *fp_out;
char *fin, *fshot, *fout, *ptr, fbegin[100], fend[100], fins[100], fin2[100];
float *indata, *Ghom, *shotdata, *shotdata_jkz, rho, fmin, fmax;
float dt, dx, t0, x0, xmin, xmax1, sclsxgx, f1, f2, dxrcv, dzrcv;
float *conv, *conv2, *tmp1, *tmp2, cp, shift;
int nshots, nt, nx, ntraces, ret, ix, it, is, ir, ig, file_det, nxs, nzs, verbose;
int pos1, npos, zmax, inx, numb, dnumb, count, scheme, ntmax, ntshift, shift_num;
segy *hdr_in, *hdr_out, *hdr_shot;
initargs(argc, argv);
requestdoc(1);
if (!getparstring("fin", &fin)) fin = NULL;
if (!getparstring("fshot", &fshot)) fshot = NULL;
if (!getparstring("fout", &fout)) fout = "out.su";
if (!getparint("zmax", &zmax)) zmax = 0;
if (!getparint("inx", &inx)) inx = 0;
if (!getparfloat("zrcv", &f1)) f1 = 0;
if (!getparfloat("xrcv", &f2)) f2 = 0;
if (!getparfloat("dzrcv", &dzrcv)) dzrcv = -1;
if (!getparfloat("dxrcv", &dxrcv)) dxrcv = -1;
if (!getparfloat("rho", &rho)) rho=1000.0;
if (!getparfloat("cp", &cp)) cp = 1500.0;
if (!getparfloat("fmin", &fmin)) fmin=0.0;
if (!getparfloat("fmax", &fmax)) fmax=100.0;
if (!getparfloat("shift", &shift)) shift=0.0;
if (!getparint("numb", &numb)) numb=0;
if (!getparint("dnumb", &dnumb)) dnumb=1;
if (!getparint("scheme", &scheme)) scheme = 0;
if (!getparint("ntmax", &ntmax)) ntmax = 0;
if (!getparint("verbose", &verbose)) verbose = 0;
if (fin == NULL) verr("Incorrect f2 input");
if (fshot == NULL) verr("Incorrect Green input");
if (dnumb == 0) dnumb = 1;
sprintf(fins,"z%d",numb);
fp_in = fopen(fin, "r");
if (fp_in == NULL) {
verr("error on opening basefile=%s", fin);
}
fclose(fp_in);
ptr = strstr(fin,fins);
pos1 = ptr - fin + 1;
sprintf(fbegin,"%*.*s", pos1-1, pos1-1, fin);
sprintf(fend,"%s", fin+pos1+1);
file_det = 1;
nzs=0;
while (file_det) {
sprintf(fins,"z%d",nzs*dnumb+numb);
sprintf(fin,"%s%s%s",fbegin,fins,fend);
fp_in = fopen(fin, "r");
if (fp_in == NULL) {
if (nzs == 0) {
verr("error on opening basefile=%s", fin);
}
else if (nzs == 1) {
vmess("1 file detected");
file_det = 0;
break;
}
else {
vmess("%d files detected",nzs);
file_det = 0;
break; }
}
fclose(fp_in);
nzs++;
}
if (inx < 1) {
inx = 1;
}
if (zmax < 1) zmax=1;
if (zmax < nzs) nzs=zmax;
nxs = inx;
count=0;
npos = nxs*nzs;
if (verbose) vmess("nxs: %d, nzs: %d",nxs,nzs);
nshots = 0;
getFileInfo(fshot, &nt, &nx, &nshots, &dt, &dx, &t0, &x0, &xmin, &xmax1, &sclsxgx, &ntraces);
if (dxrcv < 0) dxrcv=dx;
if (dzrcv < 0) dzrcv=dx;
// ngath zijn het aantal schoten
shotdata = (float *)malloc(nt*nx*nshots*sizeof(float));
hdr_shot = (segy *)calloc(nx*nshots,sizeof(segy));
fp_shot = fopen(fshot,"r");
if (fp_shot == NULL) {
verr("Could not open file");
}
vmess("nt: %d nx: %d nshots: %d",nt,nx,nshots);
fclose(fp_shot);
readSnapData(fshot, &shotdata[0], &hdr_shot[0], nshots, nx, nt, 0, nx, 0, nt);
hdr_out = (segy *)calloc(nxs,sizeof(segy));
Ghom = (float *)malloc(nt*npos*sizeof(float));
if (scheme==2) {
vmess("Classical representation");
shotdata_jkz = (float *)malloc(nt*nx*nshots*sizeof(float));
for (ix = 0; ix < nx; ix++) {
for (it = 0; it < nt; it++) {
shotdata_jkz[ix*nt+it] = shotdata[ix*nt+it];
}
}
conjugate(shotdata_jkz, nt, nx, dt);
conjugate(shotdata, nt, nx, dt);
depthDiff(shotdata_jkz, nt, nx, dt, dx, fmin, fmax, cp, 1);
if (verbose) vmess("Applied jkz to source data");
}
else if (scheme==0) {
vmess("Marchenko representation");
}
else if (scheme==1) {
vmess("Marchenko representation with multiple sources");
}
else if (scheme==3) {
vmess("Marchenko representation with multiple shot gathers");
}
#pragma omp parallel default(shared) \
private(ix,it,is,indata, hdr_in,fins,fin2,fp_in,conv,ig,conv2,tmp1,tmp2)
{
indata = (float *)malloc(nt*nx*nxs*sizeof(float));
hdr_in = (segy *)calloc(nx*nxs,sizeof(segy));
conv = (float *)calloc(nx*nt,sizeof(float)); conv2 = (float *)calloc(nx*nt,sizeof(float));
if (scheme==2) {
tmp1 = (float *)calloc(nx*nt,sizeof(float));
tmp2 = (float *)calloc(nx*nt,sizeof(float));
}
#pragma omp for
for (ir = 0; ir < nzs; ir++) {
sprintf(fins,"z%d",ir*dnumb+numb);
sprintf(fin2,"%s%s%s",fbegin,fins,fend);
fp_in = fopen(fin2, "r");
if (fp_in == NULL) {
verr("Danger Will Robinson");
}
fclose(fp_in);
readSnapData(fin2, &indata[0], &hdr_in[0], nxs, nx, nt, 0, nx, 0, nt);
for (is=0;is<nxs;is++) {
if (scheme==0) { //Marchenko representation
depthDiff(&indata[is*nx*nt], nt, nx, dt, dx, fmin, fmax, cp, 1);
convol(shotdata, &indata[is*nx*nt], conv, nx, nt, dt, -2);
timeDiff(conv, nt, nx, dt, fmin, fmax, -2);
for (ix=0; ix<nx; ix++) {
for (it=0; it<nt/2; it++) {
Ghom[(it+nt/2)*nxs*nzs+is*nzs+ir] += conv[ix*nt+it]/rho;
Ghom[it*nxs*nzs+is*nzs+ir] += conv[ix*nt+(it+nt/2)]/rho;
}
}
}
else if (scheme==1) { //Marchenko representation with multiple sources
depthDiff(&indata[is*nx*nt], nt, nx, dt, dx, fmin, fmax, cp, 1);
convol(shotdata, &indata[is*nx*nt], conv, nx, nt, dt, 0);
timeDiff(conv, nt, nx, dt, fmin, fmax, -1);
for (ix=0; ix<nx; ix++) {
for (it=0; it<nt/2; it++) {
Ghom[(it+nt/2)*nxs*nzs+is*nzs+ir] += 2*conv[ix*nt+it]/rho;
Ghom[it*nxs*nzs+is*nzs+ir] += 2*conv[ix*nt+(it+nt/2)]/rho;
}
}
}
else if (scheme==2) { //classical representation
convol(&indata[is*nx*nt], shotdata_jkz, tmp1, nx, nt, dt, 0);
depthDiff(&indata[is*nx*nt], nt, nx, dt, dx, fmin, fmax, cp, 1);
convol(&indata[is*nx*nt], shotdata, tmp2, nx, nt, dt, 0);
//corr(&indata[is*nx*nt], shotdata, tmp2, nx, nt, dt, 0);
for (ix = 0; ix < nx; ix++) {
for (it = 0; it < nt; it++) {
conv[ix*nt+it] = tmp2[ix*nt+it]+tmp1[ix*nt+it];
}
}
timeDiff(conv, nt, nx, dt, fmin, fmax, -1);
for (ix=0; ix<nx; ix++) {
for (it=0; it<nt/2; it++) {
Ghom[(it+nt/2)*nxs*nzs+is*nzs+ir] += conv[ix*nt+it]/rho;
Ghom[it*nxs*nzs+is*nzs+ir] += conv[ix*nt+(it+nt/2)]/rho;
}
}
}
if (scheme==3) { //Marchenko representation with multiple shot gathers
depthDiff(&indata[is*nx*nt], nt, nx, dt, dx, fmin, fmax, cp, 1);
for (ig=0; ig<nshots; ig++) {
convol(&shotdata[ig*nx*nt], &indata[is*nx*nt], conv, nx, nt, dt, -2);
timeDiff(conv, nt, nx, dt, fmin, fmax, -2);
shift_num = ig*((int)(shift/dt));
for (ix = 0; ix < nx; ix++) {
for (it = nt/2+1; it < nt; it++) {
conv[ix*nt+it] = 0.0;
}
for (it = shift_num; it < nt; it++) {
conv2[ix*nt+it] = conv[ix*nt+it-shift_num];
}
for (it = 0; it < shift_num; it++) { conv2[ix*nt+it] = conv[ix*nt+nt-shift_num+it];
}
}
for (ix=0; ix<nx; ix++) {
Ghom[(-1+nt/2)*nxs*nzs+is*nzs+ir] += conv2[ix*nt+nt-1]/rho;
for (it=0; it<nt/2; it++) {
Ghom[(it+nt/2)*nxs*nzs+is*nzs+ir] += conv2[ix*nt+it]/rho;
//Ghom[it*nxs*nzs+is*nzs+ir] += conv2[ix*nt+(it+nt/2)]/rho;
}
}
}
}
}
count+=1;
if (verbose) vmess("Creating Homogeneous Green's function at depth %d from %d depths",count,nzs);
}
free(conv); free(indata); free(hdr_in); free(conv2);
if (scheme==2) {
free(tmp1);free(tmp2);
}
}
free(shotdata);
if (verbose) vmess("nxs: %d nxz: %d f1: %.7f",nxs,nzs,f1);
ntshift=0;
if (ntmax > 0) {
if (ntmax < nt) {
ntshift = (nt-ntmax)/2;
if (verbose) vmess("Time shifted %d samples",ntshift);
nt=ntmax;
}
else {
if (verbose) vmess("Max time samples larger than original samples");
}
}
fp_out = fopen(fout, "w+");
for (ir = 0; ir < nt; ir++) {
for (ix = 0; ix < nxs; ix++) {
hdr_out[ix].fldr = ir+1;
hdr_out[ix].tracl = ir*nxs+ix+1;
hdr_out[ix].tracf = ix+1;
hdr_out[ix].scalco = hdr_shot[0].scalco;
hdr_out[ix].scalel = hdr_shot[0].scalel;
hdr_out[ix].sdepth = hdr_shot[0].sdepth;
hdr_out[ix].trid = 1;
hdr_out[ix].ns = nzs;
hdr_out[ix].trwf = nxs;
hdr_out[ix].ntr = hdr_out[ix].fldr*hdr_out[ix].trwf;
hdr_out[ix].f1 = f1;
hdr_out[ix].f2 = f2/1000;
hdr_out[ix].dt = dt*(1E6);
hdr_out[ix].d1 = dzrcv;
hdr_out[ix].d2 = dxrcv;
hdr_out[ix].sx = hdr_shot[0].sx;
hdr_out[ix].gx = (int)roundf(f2 + (ix*hdr_out[ix].d2)*1000.0);
hdr_out[ix].offset = (hdr_out[ix].gx - hdr_out[ix].sx)/1000.0;
}
ret = writeData(fp_out, &Ghom[(ir+ntshift)*nxs*nzs], hdr_out, nzs, nxs);
if (ret < 0 ) verr("error on writing output file.");
}
fclose(fp_out);
return 0;
}
void convol(float *data1, float *data2, float *con, int nrec, int nsam, float dt, int shift)
{
int i, j, n, optn, nfreq, sign;
float df, dw, om, tau, scl;
float *qr, *qi, *p1r, *p1i, *p2r, *p2i, *rdata1, *rdata2;
complex *cdata1, *cdata2, *ccon, tmp;
optn = optncr(nsam);
nfreq = optn/2+1;
cdata1 = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdata1 == NULL) verr("memory allocation error for cdata1");
cdata2 = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdata2 == NULL) verr("memory allocation error for cdata2");
ccon = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (ccon == NULL) verr("memory allocation error for ccov");
rdata1 = (float *)malloc(optn*nrec*sizeof(float));
if (rdata1 == NULL) verr("memory allocation error for rdata1");
rdata2 = (float *)malloc(optn*nrec*sizeof(float));
if (rdata2 == NULL) verr("memory allocation error for rdata2");
/* pad zeroes until Fourier length is reached */
pad_data(data1, nsam, nrec, optn, rdata1);
pad_data(data2, nsam, nrec, optn, rdata2);
/* forward time-frequency FFT */
sign = -1;
rcmfft(&rdata1[0], &cdata1[0], optn, nrec, optn, nfreq, sign);
rcmfft(&rdata2[0], &cdata2[0], optn, nrec, optn, nfreq, sign);
/* apply convolution */
p1r = (float *) &cdata1[0];
p2r = (float *) &cdata2[0];
qr = (float *) &ccon[0].r;
p1i = p1r + 1;
p2i = p2r + 1;
qi = qr + 1;
n = nrec*nfreq;
for (j = 0; j < n; j++) {
*qr = (*p2r**p1r-*p2i**p1i);
*qi = (*p2r**p1i+*p2i**p1r);
qr += 2;
qi += 2;
p1r += 2;
p1i += 2;
p2r += 2;
p2i += 2;
}
free(cdata1);
free(cdata2);
if (shift==1) {
df = 1.0/(dt*optn);
dw = 2*PI*df;
tau = dt*(nsam/2);
for (j = 0; j < nrec; j++) {
om = 0.0;
for (i = 0; i < nfreq; i++) {
tmp.r = ccon[j*nfreq+i].r*cos(om*tau) + ccon[j*nfreq+i].i*sin(om*tau);
tmp.i = ccon[j*nfreq+i].i*cos(om*tau) - ccon[j*nfreq+i].r*sin(om*tau);
ccon[j*nfreq+i] = tmp;
om += dw;
}
}
}
if (shift==-2) {
for (j = 0; j < nrec; j++) {
for (i = 0; i < nfreq; i++) { ccon[j*nfreq+i].r = ccon[j*nfreq+i].i;
ccon[j*nfreq+i].i = 0.0;
}
}
}
/* inverse frequency-time FFT and scale result */
sign = 1;
scl = 1.0/((float)(optn));
crmfft(&ccon[0], &rdata1[0], optn, nrec, nfreq, optn, sign);
scl_data(rdata1,optn,nrec,scl,con,nsam);
free(ccon);
free(rdata1);
free(rdata2);
return;
}
void pad_data(float *data, int nsam, int nrec, int nsamout, float *datout)
{
int it,ix;
for (ix=0;ix<nrec;ix++) {
for (it=0;it<nsam;it++)
datout[ix*nsamout+it]=data[ix*nsam+it];
for (it=nsam;it<nsamout;it++)
datout[ix*nsamout+it]=0.0;
}
}
void scl_data(float *data, int nsam, int nrec, float scl, float *datout, int nsamout)
{
int it,ix;
for (ix = 0; ix < nrec; ix++) {
for (it = 0 ; it < nsamout ; it++)
datout[ix*nsamout+it] = scl*data[ix*nsam+it];
}
}
void corr(float *data1, float *data2, float *cov, int nrec, int nsam, float dt, int shift)
{
int i, j, n, optn, nfreq, sign;
float df, dw, om, tau, scl;
float *qr, *qi, *p1r, *p1i, *p2r, *p2i, *rdata1, *rdata2;
complex *cdata1, *cdata2, *ccov, tmp;
optn = optncr(nsam);
nfreq = optn/2+1;
cdata1 = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdata1 == NULL) verr("memory allocation error for cdata1");
cdata2 = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdata2 == NULL) verr("memory allocation error for cdata2");
ccov = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (ccov == NULL) verr("memory allocation error for ccov");
rdata1 = (float *)malloc(optn*nrec*sizeof(float));
if (rdata1 == NULL) verr("memory allocation error for rdata1");
rdata2 = (float *)malloc(optn*nrec*sizeof(float));
if (rdata2 == NULL) verr("memory allocation error for rdata2");
/* pad zeroes until Fourier length is reached */
pad_data(data1, nsam, nrec, optn, rdata1);
pad_data(data2, nsam, nrec, optn, rdata2);
/* forward time-frequency FFT */
sign = -1;
rcmfft(&rdata1[0], &cdata1[0], optn, nrec, optn, nfreq, sign);
rcmfft(&rdata2[0], &cdata2[0], optn, nrec, optn, nfreq, sign);
/* apply correlation */ p1r = (float *) &cdata1[0];
p2r = (float *) &cdata2[0];
qr = (float *) &ccov[0].r;
p1i = p1r + 1;
p2i = p2r + 1;
qi = qr + 1;
n = nrec*nfreq;
for (j = 0; j < n; j++) {
*qr = (*p1r * *p2r + *p1i * *p2i);
*qi = (*p1i * *p2r - *p1r * *p2i);
qr += 2;
qi += 2;
p1r += 2;
p1i += 2;
p2r += 2;
p2i += 2;
}
free(cdata1);
free(cdata2);
/* shift t=0 to middle of time window (nsam/2)*/
if (shift) {
df = 1.0/(dt*optn);
dw = 2*PI*df;
tau = dt*(nsam/2);
for (j = 0; j < nrec; j++) {
om = 0.0;
for (i = 0; i < nfreq; i++) {
tmp.r = ccov[j*nfreq+i].r*cos(om*tau) + ccov[j*nfreq+i].i*sin(om*tau);
tmp.i = ccov[j*nfreq+i].i*cos(om*tau) - ccov[j*nfreq+i].r*sin(om*tau);
ccov[j*nfreq+i] = tmp;
om += dw;
}
}
}
/* inverse frequency-time FFT and scale result */
sign = 1;
scl = 1.0/(float)optn;
crmfft(&ccov[0], &rdata1[0], optn, nrec, nfreq, optn, sign);
scl_data(rdata1,optn,nrec,scl,cov,nsam);
free(ccov);
free(rdata1);
free(rdata2);
return;
}
void timeDiff(float *data, int nsam, int nrec, float dt, float fmin, float fmax, int opt)
{
int optn, iom, iomin, iomax, nfreq, ix, sign;
float omin, omax, deltom, om, df, *rdata, scl;
complex *cdata, *cdatascl;
optn = optncr(nsam);
nfreq = optn/2+1;
df = 1.0/(optn*dt);
cdata = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdata == NULL) verr("memory allocation error for cdata");
rdata = (float *)malloc(optn*nrec*sizeof(float));
if (rdata == NULL) verr("memory allocation error for rdata");
/* pad zeroes until Fourier length is reached */
pad_data(data,nsam,nrec,optn,rdata);
/* Forward time-frequency FFT */
sign = -1; rcmfft(&rdata[0], &cdata[0], optn, nrec, optn, nfreq, sign);
deltom = 2.*PI*df;
omin = 2.*PI*fmin;
omax = 2.*PI*fmax;
iomin = (int)MIN((omin/deltom), (nfreq));
iomin = MAX(iomin, 1);
iomax = MIN((int)(omax/deltom), (nfreq));
cdatascl = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdatascl == NULL) verr("memory allocation error for cdatascl");
for (ix = 0; ix < nrec; ix++) {
for (iom = 0; iom < iomin; iom++) {
cdatascl[ix*nfreq+iom].r = 0.0;
cdatascl[ix*nfreq+iom].i = 0.0;
}
for (iom = iomax; iom < nfreq; iom++) {
cdatascl[ix*nfreq+iom].r = 0.0;
cdatascl[ix*nfreq+iom].i = 0.0;
}
if (opt == 1) {
for (iom = iomin ; iom < iomax ; iom++) {
om = deltom*iom;
cdatascl[ix*nfreq+iom].r = -om*cdata[ix*nfreq+iom].i;
cdatascl[ix*nfreq+iom].i = om*cdata[ix*nfreq+iom].r;
}
}
else if (opt == -1) {
for (iom = iomin ; iom < iomax ; iom++) {
om = 1.0/(deltom*iom);
cdatascl[ix*nfreq+iom].r = om*cdata[ix*nfreq+iom].i;
cdatascl[ix*nfreq+iom].i = -om*cdata[ix*nfreq+iom].r;
}
}
else if (opt == -2) {
for (iom = iomin ; iom < iomax ; iom++) {
om = 4.0/(deltom*iom);
cdatascl[ix*nfreq+iom].r = om*cdata[ix*nfreq+iom].r;
cdatascl[ix*nfreq+iom].i = om*cdata[ix*nfreq+iom].i;
}
}
}
free(cdata);
/* Inverse frequency-time FFT and scale result */
sign = 1;
scl = 1.0/(float)optn;
crmfft(&cdatascl[0], &rdata[0], optn, nrec, nfreq, optn, sign);
scl_data(rdata,optn,nrec,scl,data,nsam);
free(cdatascl);
free(rdata);
return;
}
void depthDiff(float *data, int nsam, int nrec, float dt, float dx, float fmin, float fmax, float c, int opt)
{
int optn, iom, iomin, iomax, nfreq, ix, ikx, nkx, ikxmax;
float omin, omax, deltom, df, dkx, *rdata, kx, scl;
float kx2, kz2, kp2, kp;
complex *cdata, *cdatascl, kz, kzinv;
optn = optncr(nsam);
nfreq = optncr(nsam)/2+1;
df = 1.0/(optn*dt);
nkx = optncc(nrec);
dkx = 2.0*PI/(nkx*dx);
cdata = (complex *)malloc(nfreq*nkx*sizeof(complex)); if (cdata == NULL) verr("memory allocation error for cdata");
rdata = (float *)malloc(optn*nkx*sizeof(float));
if (rdata == NULL) verr("memory allocation error for rdata");
/* pad zeroes in 2 directions to reach FFT lengths */
pad2d_data(data,nsam,nrec,optn,nkx,rdata);
/* double forward FFT */
xt2wkx(&rdata[0], &cdata[0], optn, nkx, optn, nkx, 0);
deltom = 2.*PI*df;
omin = 2.*PI*fmin;
omax = 2.*PI*fmax;
iomin = (int)MIN((omin/deltom), nfreq);
iomin = MAX(iomin, 0);
iomax = MIN((int)(omax/deltom), nfreq);
cdatascl = (complex *)malloc(nfreq*nkx*sizeof(complex));
if (cdatascl == NULL) verr("memory allocation error for cdatascl");
for (iom = 0; iom < iomin; iom++) {
for (ix = 0; ix < nkx; ix++) {
cdatascl[iom*nkx+ix].r = 0.0;
cdatascl[iom*nkx+ix].i = 0.0;
}
}
for (iom = iomax; iom < nfreq; iom++) {
for (ix = 0; ix < nkx; ix++) {
cdatascl[iom*nkx+ix].r = 0.0;
cdatascl[iom*nkx+ix].i = 0.0;
}
}
if (opt > 0) {
for (iom = iomin ; iom <= iomax ; iom++) {
kp = (iom*deltom)/c;
kp2 = kp*kp;
ikxmax = MIN((int)(kp/dkx), nkx/2);
for (ikx = 0; ikx < ikxmax; ikx++) {
kx = ikx*dkx;
kx2 = kx*kx;
kz2 = kp2 - kx2;
kz.r = 0.0;
kz.i = sqrt(kz2);
cdatascl[iom*nkx+ikx].r = cdata[iom*nkx+ikx].r*kz.r-cdata[iom*nkx+ikx].i*kz.i;
cdatascl[iom*nkx+ikx].i = cdata[iom*nkx+ikx].i*kz.r+cdata[iom*nkx+ikx].r*kz.i;
}
for (ikx = ikxmax; ikx <= nkx-ikxmax+1; ikx++) {
cdatascl[iom*nkx+ikx].r = 0.0;
cdatascl[iom*nkx+ikx].i = 0.0;
}
for (ikx = nkx-ikxmax+1; ikx < nkx; ikx++) {
kx = (ikx-nkx)*dkx;
kx2 = kx*kx;
kz2 = kp2 - kx2;
kz.r = 0.0;
kz.i = sqrt(kz2);
cdatascl[iom*nkx+ikx].r = cdata[iom*nkx+ikx].r*kz.r-cdata[iom*nkx+ikx].i*kz.i;
cdatascl[iom*nkx+ikx].i = cdata[iom*nkx+ikx].i*kz.r+cdata[iom*nkx+ikx].r*kz.i;
}
}
}
else if (opt < 0) {
for (iom = iomin ; iom < iomax ; iom++) {
kp = iom*deltom/c;
kp2 = kp*kp; ikxmax = MIN((int)(kp/dkx), nkx/2);
for (ikx = 0; ikx < ikxmax; ikx++) {
kx = ikx*dkx;
kx2 = kx*kx;
kz2 = kp2 - kx2;
kzinv.r = 0.0;
kzinv.i = -sqrt(kz2)/kz2;
cdatascl[iom*nkx+ikx].r = cdata[iom*nkx+ikx].r*kzinv.r-cdata[iom*nkx+ikx].i*kzinv.i;
cdatascl[iom*nkx+ikx].i = cdata[iom*nkx+ikx].i*kzinv.r+cdata[iom*nkx+ikx].r*kzinv.i;
}
for (ikx = ikxmax; ikx <= nkx-ikxmax+1; ikx++) {
cdatascl[iom*nkx+ikx].r = 0.0;
cdatascl[iom*nkx+ikx].i = 0.0;
}
for (ikx = nkx-ikxmax+1; ikx < nkx; ikx++) {
kx = (ikx-nkx)*dkx;
kx2 = kx*kx;
kz2 = kp2 - kx2;
kzinv.r = 0.0;
kzinv.i = -sqrt(kz2)/kz2;
cdatascl[iom*nkx+ikx].r = cdata[iom*nkx+ikx].r*kzinv.r-cdata[iom*nkx+ikx].i*kzinv.i;
cdatascl[iom*nkx+ikx].i = cdata[iom*nkx+ikx].i*kzinv.r+cdata[iom*nkx+ikx].r*kzinv.i;
}
}
}
free(cdata);
/* inverse double FFT */
wkx2xt(&cdatascl[0], &rdata[0], optn, nkx, nkx, optn, 0);
/* select original samples and traces */
scl = 1.0;
scl_data(rdata,optn,nrec,scl,data,nsam);
free(cdatascl);
free(rdata);
return;
}
void pad2d_data(float *data, int nsam, int nrec, int nsamout, int nrecout, float *datout)
{
int it,ix;
for (ix=0;ix<nrec;ix++) {
for (it=0;it<nsam;it++)
datout[ix*nsam+it]=data[ix*nsam+it];
for (it=nsam;it<nsamout;it++)
datout[ix*nsam+it]=0.0;
}
for (ix=nrec;ix<nrecout;ix++) {
for (it=0;it<nsamout;it++)
datout[ix*nsam+it]=0.0;
}
}
void conjugate(float *data, int nsam, int nrec, float dt)
{
int optn, nfreq, j, ix, it, sign, ntdiff;
float *rdata, scl;
complex *cdata;
optn = optncr(nsam);
ntdiff = optn-nsam;
nfreq = optn/2+1;
cdata = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdata == NULL) verr("memory allocation error for cdata");
rdata = (float *)malloc(optn*nrec*sizeof(float));
if (rdata == NULL) verr("memory allocation error for rdata");
/* pad zeroes until Fourier length is reached */ pad_data(data,nsam,nrec,optn,rdata);
/* Forward time-frequency FFT */
sign = -1;
rcmfft(&rdata[0], &cdata[0], optn, nrec, optn, nfreq, sign);
/* take complex conjugate */
for(ix = 0; ix < nrec; ix++) {
for(j = 0; j < nfreq; j++) cdata[ix*nfreq+j].i = -cdata[ix*nfreq+j].i;
}
/* Inverse frequency-time FFT and scale result */
sign = 1;
scl = 1.0/(float)optn;
crmfft(&cdata[0], &rdata[0], optn, nrec, nfreq, optn, sign);
for (ix = 0; ix < nrec; ix++) {
for (it = 0 ; it < nsam ; it++)
data[ix*nsam+it] = scl*rdata[ix*optn+it+ntdiff];
}
//scl_data(rdata,optn,nrec,scl,data,nsam);
free(cdata);
free(rdata);
return;
}
void timeShift(float *data, int nsam, int nrec, float dt, float shift, float fmin, float fmax)
{
int optn, iom, iomin, iomax, nfreq, ix, sign;
float omin, omax, deltom, om, tom, df, *rdata, scl;
complex *cdata, *cdatascl;
optn = optncr(nsam);
nfreq = optn/2+1;
df = 1.0/(optn*dt);
cdata = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdata == NULL) verr("memory allocation error for cdata");
rdata = (float *)malloc(optn*nrec*sizeof(float));
if (rdata == NULL) verr("memory allocation error for rdata");
/* pad zeroes until Fourier length is reached */
pad_data(data,nsam,nrec,optn,rdata);
/* Forward time-frequency FFT */
sign = -1;
rcmfft(&rdata[0], &cdata[0], optn, nrec, optn, nfreq, sign);
deltom = 2.*PI*df;
omin = 2.*PI*fmin;
omax = 2.*PI*fmax;
iomin = (int)MIN((omin/deltom), (nfreq));
iomax = MIN((int)(omax/deltom), (nfreq));
cdatascl = (complex *)malloc(nfreq*nrec*sizeof(complex));
if (cdatascl == NULL) verr("memory allocation error for cdatascl");
for (ix = 0; ix < nrec; ix++) {
for (iom = 0; iom < iomin; iom++) {
cdatascl[ix*nfreq+iom].r = 0.0;
cdatascl[ix*nfreq+iom].i = 0.0;
}
for (iom = iomax; iom < nfreq; iom++) {
cdatascl[ix*nfreq+iom].r = 0.0;
cdatascl[ix*nfreq+iom].i = 0.0;
}
for (iom = iomin ; iom < iomax ; iom++) {
om = deltom*iom; tom = om*shift;
cdatascl[ix*nfreq+iom].r = cdata[ix*nfreq+iom].r*cos(-tom) - cdata[ix*nfreq+iom].i*sin(-tom);
cdatascl[ix*nfreq+iom].i = cdata[ix*nfreq+iom].i*cos(-tom) + cdata[ix*nfreq+iom].r*sin(-tom);
}
}
free(cdata);
/* Inverse frequency-time FFT and scale result */
sign = 1;
scl = 1.0/(float)optn;
crmfft(&cdatascl[0], &rdata[0], optn, nrec, nfreq, optn, sign);
scl_data(rdata,optn,nrec,scl,data,nsam);
free(cdatascl);
free(rdata);
return;
}