taper_grad.c 16.1 KB
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/*-----------------------------------------------------------------------------------------
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 * Copyright (C) 2016  For the list of authors, see file AUTHORS.
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 *
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 * This file is part of IFOS.
 * 
 * IFOS is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2.0 of the License only.
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 * 
 * IFOS is distributed in the hope that it will be useful,
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 * 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.
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 * 
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 * You should have received a copy of the GNU General Public License
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 * along with IFOS. See file COPYING and/or <http://www.gnu.org/licenses/gpl-2.0.html>.
-----------------------------------------------------------------------------------------*/
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/*------------------------------------------------------------------------
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 * taper gradient with a gaussian frame to damp inversion artefacts near the sources and receivers
 sws == 1 vertical taper (for tomography geometry)
 sws == 2 horizontal taper (for reflection geometry)
 sws == 3 local radial taper at the source and receiver positions
 sws == 4 custom taper
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 ------------------------------------------------------------------------*/
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#include "fd.h"

void taper_grad(float ** waveconv,float ** taper_coeff, float **srcpos, int nshots, int **recpos, int ntr, int sws)
{
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	/* extern variables */

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    extern float DH;
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	extern int FREE_SURF, NX, NY, NXG, NYG;
	extern int NPROCX, NPROCY, MYID, POS[3];
	extern FILE *FP;
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	extern char TAPER_FILE_NAME[STRING_SIZE];
    extern int USE_WORKFLOW, WORKFLOW_STAGE;
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	/* local variables */
	int i, j, h, ifw, ii, jj, n, xb, yb, xe, ye, taperlength,taperlength2, VTON, SRTON;
	int ijc, iy, ix, iii, jjj, xx, yy, srctaper_gridpt, i1, j1;

	extern int GRADT1, GRADT2, GRADT3, GRADT4;
	float amp, a, *window, grad_tap, **waveconvtmp;
	char modfile[STRING_SIZE];
	
	extern float SRTRADIUS;
	extern int SRTSHAPE, FILTSIZE;
        float **m, **edgemat, **mm, **msum, minm, maxm, x, y, rad, **taper_coeff_glob;
        float maxrad;
	char taper_file[STRING_SIZE];
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    extern int VERBOSE;
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	FILE *fp_taper;

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    /* =============== */
    /* Vertical taper  */
    /* =============== */
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	if(sws==1){
	
	/* define taper geometry */
	taperlength=GRADT2-GRADT1;
	taperlength2=GRADT4-GRADT3;
	ifw = GRADT4-GRADT1;
	
	if (MYID==0&&VERBOSE)
	{
		fprintf(FP,"\n **Message from taper_grid (printed by PE %d):\n",MYID);
		fprintf(FP," Coefficients for gradient taper are now calculated.\n");
	}
	
	waveconvtmp = matrix(0,NY+1,0,NX+1);
	window=vector(1,ifw);
	 
	 /* Gaussian window */  
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        a=3;    /* damping coefficient */
        for (i=1;i<=ifw;i++){
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	window[i] = 1.0;
	
	    if(i<=taperlength){
	       window[i] = exp(-(1.0/2.0)*(a*(i-taperlength)/(taperlength/2.0))*(a*(i-taperlength)/(taperlength/2.0)));
	    }
	    
	    if(i>=(ifw-taperlength2)){
	       window[i] = exp(-(1.0/2.0)*(a*(i-(ifw-taperlength2))/(taperlength2/2.0))*(a*(i-(ifw-taperlength2))/(taperlength2/2.0)));
	    }
	    
	}
	
	/* loop over global grid */
	for (j=1;j<=NYG;j++){
	
	   h=1;
	   for (i=1;i<=NXG;i++){

                        grad_tap=0.0;
			
			if((i>GRADT1)&&(i<GRADT4)){
			   grad_tap=window[h];
			   h++;
			}
			   			
			if ((POS[1]==((i-1)/NX)) && 
		   	 (POS[2]==((j-1)/NY))){
				ii=i-POS[1]*NX;
				jj=j-POS[2]*NY;

				taper_coeff[jj][ii]=grad_tap;

			}
		}
	}	
	
	/* apply taper on local gradient */
	for (j=1;j<=NY;j++){
	   for (i=1;i<=NX;i++){
           waveconv[j][i]*=taper_coeff[j][i];
	   waveconvtmp[j][i] = waveconv[j][i];
           }
	}
	
		
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        /* apply filter at shot and receiver points */
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	for (n=1;n<=nshots;n++)
	{
		i = iround(srcpos[1][n]/DH);
		j = iround(srcpos[2][n]/DH);
		if ((POS[1]==((i-1)/NX)) && (POS[2]==((j-1)/NY))){
			ii = i-POS[1]*NX;
			jj = j-POS[2]*NY;
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			waveconvtmp[jj][ii] = 0.0;
		}
	}

	for (j=1;j<=NY;j++){
		for (i=1;i<=NX;i++){
        		waveconv[j][i] = waveconvtmp[j][i];
		}
	}	
	
	for (n=1;n<=ntr;n++)
	{
		i = recpos[1][n];
		j = recpos[2][n];
		if ((POS[1]==((i-1)/NX)) && (POS[2]==((j-1)/NY))){
			ii = i-POS[1]*NX;
			jj = j-POS[2]*NY;
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			waveconvtmp[jj][ii] = 0.0;
			
		}
	}

	for (j=1;j<=NY;j++){
		for (i=1;i<=NX;i++){
        		waveconv[j][i] = waveconvtmp[j][i];
		}
	}	

	sprintf(modfile,"taper_coeff_vert.bin");

	writemod(modfile,taper_coeff,3); 

	MPI_Barrier(MPI_COMM_WORLD);

	if (MYID==0) mergemod(modfile,3); 


	free_vector(window,1,ifw);
	free_matrix(waveconvtmp,0,NX+1,0,NY+1);
	}

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	/* ======================== */
	/* Horizontal Taper         */
	/* ======================== */
	
	if(sws==2){
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        /* define taper geometry */
        taperlength=GRADT2-GRADT1;
        taperlength2=GRADT4-GRADT3;
        ifw = GRADT2-GRADT1+1;
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        if (MYID==0&&VERBOSE){
            printf("%d \t %d \t %d \t %d \n",GRADT1, GRADT2, GRADT3, GRADT4);
            printf("%d \t %d \t %d \n",taperlength, taperlength2,ifw);
            fprintf(FP,"\n **Message from taper_grid (printed by PE %d):\n",MYID);
            fprintf(FP," Coefficients for gradient taper are now calculated.\n");
        }
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        waveconvtmp = matrix(0,NY+1,0,NX+1);
        window=vector(1,ifw);
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        /* Gaussian window */  
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        a=3;    /* damping coefficient */
        for (i=1;i<=ifw;i++){
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        window[i] = 1.0;

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            if(i<=taperlength){
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               window[i] = exp(-(1.0/2.0)*(a*(i-taperlength)/(taperlength/2.0))*(a*(i-taperlength)/(taperlength/2.0)));
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            }
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        }
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        /* loop over global grid */
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	h=1;
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        for (j=1;j<=NYG;j++){
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           for (i=1;i<=NXG;i++){

                        grad_tap=0.0;

                        if((j>=GRADT1)&&(j<=GRADT2)){
                           grad_tap=window[h];
                        }

                        if(j>GRADT2){
                          
			  grad_tap=1.0;

                        }
			
			  
                        if ((POS[1]==((i-1)/NX)) && 
                         (POS[2]==((j-1)/NY))){
                                ii=i-POS[1]*NX;
                                jj=j-POS[2]*NY;

                                taper_coeff[jj][ii]=grad_tap;

                        }

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                }
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	   if(j>=GRADT1){h++;}
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        }
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        /* apply taper on local gradient */
        for (j=1;j<=NY;j++){
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           for (i=1;i<=NX;i++){
           waveconv[j][i]*=taper_coeff[j][i];
           waveconvtmp[j][i] = waveconv[j][i];
           }
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        }
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        sprintf(modfile,"taper_coeff_hor.bin");
        writemod(modfile,taper_coeff,3); 
        MPI_Barrier(MPI_COMM_WORLD);
        if (MYID==0) mergemod(modfile,3); 


        free_vector(window,1,ifw);
        free_matrix(waveconvtmp,0,NX+1,0,NY+1);
        } /* end of sws==2 */

        /* =================================== */
        /* taper source and receiver positions */
	/* =================================== */
	
	if(sws==3) {
                /* Convert from meters to gridpoints -> minimum 5x5 gridpoints */
                srctaper_gridpt = (int)(ceil(2.0*SRTRADIUS/DH));
                if (srctaper_gridpt<5)  srctaper_gridpt = 5;

                m               = matrix(1,srctaper_gridpt,1,srctaper_gridpt);
                edgemat         = matrix(1,4,1,1);
                mm              = matrix(1,NYG,1,NXG);
                msum            = matrix(1,NYG,1,NXG);
                taper_coeff_glob= matrix(1,NYG,1,NXG);
		waveconvtmp     = matrix(0,NY+1,0,NX+1);

                for (iy=1;iy<=NYG;iy++)
                        for (ix=1;ix<=NXG;ix++)  msum[iy][ix] = 1.0;

                MPI_Barrier(MPI_COMM_WORLD);

                /*****************************/
                /* Taper at source positions */
                /*****************************/

                a = 1.0;
                maxrad = sqrt(2.0*SRTRADIUS*SRTRADIUS);
                for (j=1;j<=srctaper_gridpt;j++) {
                        for (i=1;i<=srctaper_gridpt;i++) {
                                x = ((float)i-((float)srctaper_gridpt)/2.0-0.5)*DH;
                                y = ((float)j-((float)srctaper_gridpt)/2.0-0.5)*DH;
                                rad = sqrt(x*x+y*y);

                                switch (SRTSHAPE) {
                                case 1:
                                        m[j][i] = erf(a*rad/maxrad);
                                        break;
                                case 2:
                                        if (rad>0)      m[j][i] = log(rad);
                                        else            m[j][i] = 0.0;
                                        break;
                                }
                        }
                }

                /* generate local taper matrix */
                minm = minimum_m(m,srctaper_gridpt,srctaper_gridpt);
                for (j=1;j<=srctaper_gridpt;j++)
                        for (i=1;i<=srctaper_gridpt;i++)  m[j][i] -= minm;

                /* normalize taper matrix to max of values at the centre of all 4 taper area edges,     */
                /* not the global maximum, which is located at the corners                              */
                edgemat[1][1] = m[1][srctaper_gridpt/2];
                edgemat[2][1] = m[srctaper_gridpt/2][1];
                edgemat[3][1] = m[srctaper_gridpt/2][srctaper_gridpt];
                edgemat[4][1] = m[srctaper_gridpt][srctaper_gridpt/2];
                maxm = maximum_m(edgemat,1,4);
                for (j=1;j<=srctaper_gridpt;j++)
                        for (i=1;i<=srctaper_gridpt;i++) {
                                m[j][i] /= maxm;
                                if (m[j][i]>1.0)  m[j][i] = 1.0;
                        }

                /* get central position within the taper */
                ijc = (int)(ceil((float)srctaper_gridpt/2));

                /*********************/
                /* loop over sources */
                for (n=1;n<=nshots;n++) {
                        for (iy=1;iy<=NYG;iy++)
                                for (ix=1;ix<=NXG;ix++)  mm[iy][ix] = 1.0;

                        i = iround(srcpos[1][n]/DH);
                        j = iround(srcpos[2][n]/DH);
                        for (iy=1;iy<=srctaper_gridpt;iy++) {
                                for (ix=1;ix<=srctaper_gridpt;ix++) {
                                        xx = i + ix - ijc;
                                        yy = j + iy - ijc;
                                        if ((xx<1) || (xx>NXG) || (yy<1) || (yy>NYG))  continue;
                                        mm[yy][xx] = m[iy][ix];
                                }
                        }

                        for (iy=1;iy<=NYG;iy++)
                                for (ix=1;ix<=NXG;ix++)
                                        if (msum[iy][ix] > mm[iy][ix])
                                                msum[iy][ix] = mm[iy][ix];

                }

                minm = minimum_m(msum,NXG,NYG);
                for (iy=1;iy<=NYG;iy++)
                        for (ix=1;ix<=NXG;ix++)  msum[iy][ix] -= minm;

                maxm = maximum_m(msum,NXG,NYG);
                for (iy=1;iy<=NYG;iy++)
                        for (ix=1;ix<=NXG;ix++) {
                                taper_coeff_glob[iy][ix] = msum[iy][ix]/maxm;

                                if ((POS[1]==((ix-1)/NX)) && (POS[2]==((iy-1)/NY))){
                                        ii = ix-POS[1]*NX;
                                        jj = iy-POS[2]*NY;
					taper_coeff[jj][ii]=msum[iy][ix]/maxm;
                                }
                        }
			
	/* apply taper on local gradient */
        for (j=1;j<=NY;j++){
           for (i=1;i<=NX;i++){
           waveconv[j][i]*=taper_coeff[j][i];
           waveconvtmp[j][i] = waveconv[j][i];
           }
        }	
		
	 /* apply filter at shot and receiver points */
	for (n=1;n<=nshots;n++)
	{
		i1 = iround(srcpos[1][n]/DH);
		j1 = iround(srcpos[2][n]/DH);
		
		for (i=i1-FILTSIZE;i<=i1+FILTSIZE;i++){
		   for (j=j1-FILTSIZE;j<=j1+FILTSIZE;j++){
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		       if ((POS[1]==((i-1)/NX)) && (POS[2]==((j-1)/NY))){
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			     ii = i-POS[1]*NX;
			     jj = j-POS[2]*NY;
			     /*waveconvtmp[jj][ii] = 1*waveconv[jj][ii]
				       		+ 8*(waveconv[jj-1][ii] + waveconv[jj+1][ii] + waveconv[jj][ii-1] + waveconv[jj][ii+1])
						+ 4*(waveconv[jj-1][ii-1] + waveconv[jj-1][ii+1] + waveconv[jj+1][ii+1] + waveconv[jj+1][ii-1]);
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			      waveconvtmp[jj][ii] = waveconvtmp[jj][ii]/49;*/
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			      if (jj>0){
			         waveconvtmp[jj][ii] = 0.0;
			         taper_coeff[jj][ii] = 0.0;
			      }
		        }
		    }
		}
		
		
	}

	
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        /* apply taper on local gradient */
        for (j=1;j<=NY;j++){
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           for (i=1;i<=NX;i++){
           waveconv[j][i] = waveconvtmp[j][i];
           }
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        }
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                free_matrix(m,1,srctaper_gridpt,1,srctaper_gridpt);
                free_matrix(edgemat,1,4,1,1);
                free_matrix(mm,1,NYG,1,NXG);
                free_matrix(msum,1,NYG,1,NXG);
                free_matrix(taper_coeff_glob,1,NYG,1,NXG);
		free_matrix(waveconvtmp,0,NX+1,0,NY+1);
        
		
	MPI_Barrier(MPI_COMM_WORLD);
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        sprintf(modfile,"taper_coeff_sources.bin");
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        writemod(modfile,taper_coeff,3); 
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        MPI_Barrier(MPI_COMM_WORLD);
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        if (MYID==0) mergemod(modfile,3); 
	
	}

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    /* ======================== */
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    /* Read Taper from file     */  
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    /* ======================== */
        
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    if((sws>=4)&&(sws<=6)){
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        if (MYID==0&&VERBOSE)
        {
            fprintf(FP,"\n **Message from taper_grad (printed by PE %d):\n",MYID);
            fprintf(FP," Coefficients for gradient tapers are now read in.\n");
        }
    
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        if(sws==4){
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        if(USE_WORKFLOW){
            sprintf(taper_file,"%s_%i.vp",TAPER_FILE_NAME,WORKFLOW_STAGE);
            fp_taper=fopen(taper_file,"r");
            if(fp_taper==NULL){
                sprintf(taper_file,"%s.vp",TAPER_FILE_NAME);
                fp_taper=fopen(taper_file,"r");
            }
        }else{
            sprintf(taper_file,"%s.vp",TAPER_FILE_NAME);
            fp_taper=fopen(taper_file,"r");
        }
        }
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        if(sws==5){
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        if(USE_WORKFLOW){
            sprintf(taper_file,"%s_%i.vs",TAPER_FILE_NAME,WORKFLOW_STAGE);
            fp_taper=fopen(taper_file,"r");
            if(fp_taper==NULL){
                sprintf(taper_file,"%s.vs",TAPER_FILE_NAME);
                fp_taper=fopen(taper_file,"r");
            }
        }else{
            sprintf(taper_file,"%s.vs",TAPER_FILE_NAME);
            fp_taper=fopen(taper_file,"r");
        }
        }
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        if(sws==6){
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        if(USE_WORKFLOW){
            sprintf(taper_file,"%s_%i.rho",TAPER_FILE_NAME,WORKFLOW_STAGE);
            fp_taper=fopen(taper_file,"r");
            if(fp_taper==NULL){
                sprintf(taper_file,"%s.rho",TAPER_FILE_NAME);
                fp_taper=fopen(taper_file,"r");
            }
        }else{
            sprintf(taper_file,"%s.rho",TAPER_FILE_NAME);
            fp_taper=fopen(taper_file,"r");
        }
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        }
        
        if(fp_taper==NULL) {
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            err("Taper file could not be opened");
        }
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        /* loop over global grid */
        for (i=1;i<=NXG;i++){
            for (j=1;j<=NYG;j++){
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                if(feof(fp_taper)){
                    err("Taper file is to small. Check NX*NY of taper file.");
                }
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                fread(&grad_tap, sizeof(float), 1, fp_taper);
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                if ((POS[1]==((i-1)/NX)) && (POS[2]==((j-1)/NY))){
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                   ii=i-POS[1]*NX;
                   jj=j-POS[2]*NY;
        
                   taper_coeff[jj][ii]=grad_tap;
                             
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                }
            }
        }
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        for (j=1;j<=NY;j++){   
           for (i=1;i<=NX;i++){     
              waveconv[j][i]*=taper_coeff[j][i];
           }                            
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        }   
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        fclose(fp_taper);
        
        sprintf(modfile,"taper_coeff_file.bin");
        writemod(modfile,taper_coeff,3);
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        MPI_Barrier(MPI_COMM_WORLD);
        if (MYID==0) mergemod(modfile,3);       
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        } 
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}