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Mlsprtm2d.c
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Mlsprtm2d.c
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/* least-squares prestack RTM in 2-D */
/*
Copyright (C)
- 2014 Xi'an Jiaotong University, UT Austin (Pengliang Yang)
- 2017, Uinversity of Calgary, Daniel Trad:
Operator modified to pass the adjoint. Added adjoint tests as well.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <rsf.h>
#include "prtm2d.h"
int main(int argc, char* argv[])
{
bool verb, fromBoundary;
int nb, nz, nx, nt, ns, ng, niter, csd, sxbeg, szbeg, jsx, jsz, gxbeg, gzbeg, jgx, jgz;
float dz, dx, dt, fm, o1, o2, amp;
float **v0, *mod, *dat;
int testadj;
sf_file shots, imglsm, imgrtm, velo;/* I/O files */
/* initialize Madagascar */
sf_init(argc,argv);
shots = sf_input ("in"); /* shot records, data */
velo = sf_input ("vel"); /* velocity */
imglsm = sf_output("out"); /* output LSRTM imglsme, model */
imgrtm = sf_output("imgrtm"); /* output RTM imglsme */
if (!sf_histint(velo,"n1",&nz)) sf_error("n1");
/* 1st dimension size */
if (!sf_histint(velo,"n2",&nx)) sf_error("n2");
/* 2nd dimension size */
if (!sf_histfloat(velo,"d1",&dz)) sf_error("d1");
/* d1 */
if (!sf_histfloat(velo,"d2",&dx)) sf_error("d2");
/* d2 */
if (!sf_histfloat(velo,"o1",&o1)) sf_error("o1");
/* o1 */
if (!sf_histfloat(velo,"o2",&o2)) sf_error("o2");
/* o2 */
if (!sf_getbool("verb",&verb)) verb=true;
/* verbosity */
if (!sf_getint("niter",&niter)) niter=10;
/* totol number of least-squares iteration*/
if (!sf_getint("nb",&nb)) nb=20;
/* number (thickness) of ABC on each side */
if (!sf_getbool("fromBoundary",&fromBoundary)) fromBoundary=true;
/* if fromBoundary=true, reconstruct source wavefield from stored boundary */
if (!sf_getint("testadj",&testadj)) testadj=0;
/* if testadj = 1 then program only testadj without calculating */
if (!sf_histint(shots,"n1",&nt)) sf_error("no nt");
/* total modeling time steps */
if (!sf_histint(shots,"n2",&ng)) sf_error("no ng");
/* total receivers in each shot */
if (!sf_histint(shots,"n3",&ns)) sf_error("no ns");
/* number of shots */
if (!sf_histfloat(shots,"d1",&dt)) sf_error("no dt");
/* time sampling interval */
if (!sf_histfloat(shots,"amp",&)) sf_error("no amp");
/* maximum amplitude of ricker */
if (!sf_histfloat(shots,"fm",&fm)) sf_error("no fm");
/* dominant freq of ricker */
if (!sf_histint(shots,"sxbeg",&sxbeg)) sf_error("no sxbeg");
/* x-begining index of sources, starting from 0 */
if (!sf_histint(shots,"szbeg",&szbeg)) sf_error("no szbeg");
/* x-begining index of sources, starting from 0 */
if (!sf_histint(shots,"gxbeg",&gxbeg)) sf_error("no gxbeg");
/* x-begining index of receivers, starting from 0 */
if (!sf_histint(shots,"gzbeg",&gzbeg)) sf_error("no gzbeg");
/* x-begining index of receivers, starting from 0 */
if (!sf_histint(shots,"jsx",&jsx)) sf_error("no jsx");
/* source x-axis jump interval */
if (!sf_histint(shots,"jsz",&jsz)) sf_error("no jsz");
/* source z-axis jump interval */
if (!sf_histint(shots,"jgx",&jgx)) sf_error("no jgx");
/* receiver x-axis jump interval */
if (!sf_histint(shots,"jgz",&jgz)) sf_error("no jgz");
/* receiver z-axis jump interval */
if (!sf_histint(shots,"csdgather",&csd)) sf_error("csdgather or not required");
/* default, common shot-gather; if n, record at every point*/
sf_putint(imglsm,"n1",nz);
sf_putint(imglsm,"n2",nx);
sf_putint(imglsm,"n3",1);
sf_putfloat(imglsm,"d1",dz);
sf_putfloat(imglsm,"d2",dx);
sf_putfloat(imglsm,"o1",o1);
sf_putfloat(imglsm,"o2",o2);
sf_putstring(imglsm,"label1","Depth");
sf_putstring(imglsm,"label2","Distance");
sf_putint(imgrtm,"n1",nz);
sf_putint(imgrtm,"n2",nx);
sf_putint(imgrtm,"n3",1);
sf_putfloat(imgrtm,"d1",dz);
sf_putfloat(imgrtm,"d2",dx);
sf_putfloat(imgrtm,"o1",o1);
sf_putfloat(imgrtm,"o2",o2);
sf_putstring(imgrtm,"label1","Depth");
sf_putstring(imgrtm,"label2","Distance");
/* In rtm, vv is the velocity model [modl], which is input parameter;
mod is the imglsme/reflectivity [imglsm]; dat is seismogram [data]! */
v0=sf_floatalloc2(nz,nx);
mod=sf_floatalloc(nz*nx);
dat=sf_floatalloc(nt*ng*ns);
/* initialize velocity, model and data */
sf_floatread(v0[0], nz*nx, velo);
memset(mod, 0, nz*nx*sizeof(float));
sf_floatread(dat, nt*ng*ns, shots);
prtm2d_init(verb, csd, fromBoundary, dz, dx, dt, amp, fm, nz, nx, nb, nt, ns, ng,
sxbeg, szbeg, jsx, jsz, gxbeg, gzbeg, jgx, jgz, v0, mod, dat);
// run adjoint test first.
sf_warning("adjoint test \n");
if (testadj){
prtm2d_adjtest();
sf_warning("exiting after testadj\n");
mod=NULL;
sf_floatwrite(mod,nz*nx,imgrtm);
sf_floatwrite(mod,nz*nx,imglsm);
prtm2d_close();
free(*v0); free(v0);
free(mod);
free(dat);
exit (0);
}
sf_warning("start migration\n");
/* original RTM is simply applying adjoint of prtm2d_lop once!*/
prtm2d_lop(true, false, nz*nx, nt*ng*ns, mod, dat);
sf_floatwrite(mod, nz*nx, imgrtm);/* output RTM image */
sf_warning("migration ends");
if (niter>0){
memset(mod, 0, nz*nx*sizeof(float));//very important
sf_warning("inside LS loop niter= %d\n",niter);
/* least squares migration */
sf_solver(prtm2d_lop, sf_cgstep, nz*nx, nt*ng*ns, mod, dat, niter, "verb", verb, "end");
sf_floatwrite(mod, nz*nx, imglsm); /* output inverted image */
sf_cgstep_close();
}
prtm2d_close();
free(*v0); free(v0);
free(mod);
free(dat);
exit(0);
}