taper_grad.c 20.3 KB
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/*-----------------------------------------------------------------------------------------
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 * Copyright (C) 2016  For the list of authors, see file AUTHORS.
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 *
 * This file is part of DENISE.
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 *
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 * DENISE 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, version 2.0 of the License only.
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 *
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 * DENISE 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.
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 *
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 * You should have received a copy of the GNU General Public License
 * along with DENISE. 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
 */

#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 */
    
    extern float DH;
    extern int FREE_SURF, NX, NY, NXG, NYG;
    extern int NPROCX, NPROCY, MYID, POS[3];
    extern FILE *FP;
    extern char TAPER_FILE_NAME[STRING_SIZE], TAPER_FILE_NAME_U[STRING_SIZE], TAPER_FILE_NAME_RHO[STRING_SIZE];
    
    /* 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;
    
    /*SRTSHAPE=2;
     SRTRADIUS=25.0;
     filtsize=2;*/
    
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    /* =============== */
    /* Vertical taper  */
    /* =============== */
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    if(sws==1){
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        /* define taper geometry */
        taperlength=GRADT2-GRADT1;
        taperlength2=GRADT4-GRADT3;
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        ifw = GRADT4-GRADT1;
        
        /*printf("%d \t %d \t %d \t %d \n",GRADT1, GRADT2, GRADT3, GRADT4);
         printf("%d \t %d \t %d \n",taperlength, taperlength2,ifw);*/
        
        if (MYID==0&&VERBOSE)
        {
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            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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        }
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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)));
            }
            
            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)));
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            }
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        }
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        /* loop over global grid */
        for (j=1;j<=NYG;j++){
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            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;
                    
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                }
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            }
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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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        /* apply filter at shot and receiver points */
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        for (n=1;n<=nshots;n++)
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        {
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            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;
                /*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]);
                 waveconvtmp[jj][ii] = waveconvtmp[jj][ii]/49;*/
                
                waveconvtmp[jj][ii] = 0.0;
            }
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        }
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        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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        for (n=1;n<=ntr;n++)
        {
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            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;
                /*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]);
                 waveconvtmp[jj][ii] = waveconvtmp[jj][ii]/49;*/
                
                waveconvtmp[jj][ii] = 0.0;
                
            }
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        }
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        for (j=1;j<=NY;j++){
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            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);
    }
    
    
    /* ======================== */
    /* Horizontal Taper         */
    /* ======================== */
    
    if(sws==2){
        /* define taper geometry */
        taperlength=GRADT2-GRADT1;
        taperlength2=GRADT4-GRADT3;
        ifw = GRADT2-GRADT1+1;
        
        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");
        }
        
        waveconvtmp = matrix(0,NY+1,0,NX+1);
        window=vector(1,ifw);
        
        /* Gaussian window */
        a=3;    /* damping coefficient */
        for (i=1;i<=ifw;i++){
            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)));
            }
            
        }
        
        /* loop over global grid */
        h=1;
        for (j=1;j<=NYG;j++){
            for (i=1;i<=NXG;i++){
                
                grad_tap=0.0;
                
                if((j>=GRADT1)&&(j<=GRADT2)){
                    grad_tap=window[h];
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                }
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                if(j>GRADT2){
                    
                    /*grad_tap=((float)(j*DH))*((float)(j*DH))*((float)(j*DH));*/
                    /* grad_tap=((float)(j*DH))*((float)(j*DH));*/
                    
                    /*grad_tap=((float)(j*DH));*/    /*Version of Daniel */
                    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;
                    
                }
                
            }
            
            if(j>=GRADT1){h++;}
        }
        
        /* 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++)
         {
         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;
         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]);
         waveconvtmp[jj][ii] = waveconvtmp[jj][ii]/49;
         }
         }
         
         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;
         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]);
         waveconvtmp[jj][ii] = waveconvtmp[jj][ii]/49;
         }
         }
         
         for (j=1;j<=NY;j++){
         for (i=1;i<=NX;i++){
         waveconv[j][i] = waveconvtmp[j][i];
         }
         }*/
        
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        sprintf(modfile,"taper_coeff_hor.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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        free_vector(window,1,ifw);
        free_matrix(waveconvtmp,0,NX+1,0,NY+1);
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    } /* 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;
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                }
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            }
        }
        
        /* 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];
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                }
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            }
            
            /*                      for (iy=1;iy<=NYG;iy++)
             for (ix=1;ix<=NXG;ix++)  msum[iy][ix] += mm[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];
            
        }
        
        /***********************/
        /* loop over receivers */
        /*for (n=1;n<=ntr;n++) {
         for (iy=1;iy<=NYG;iy++)
         for (ix=1;ix<=NXG;ix++)  mm[iy][ix] = 1.0;
         
         i = recpos[1][n];
         j = recpos[2][n];
         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++)    Die kommenden zwei Zeilen wurden von Daniel auskommentiert.
         for (ix=1;ix<=NXG;ix++)  msum[iy][ix] += mm[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;
                    /*Diese Zeile wurde von Daniel auskommentiert: taper_coeff[jj][ii] = taper_coeff_glob[iy][ix] * ((float)(iy*DH));*/
                    /*taper_coeff[jj][ii] = ((float)(iy*DH)) * ((float)(iy*DH)) * ((float)(iy*DH));*/
                    taper_coeff[jj][ii]=msum[iy][ix]/maxm;
                }
            }
        
        /* apply taper on local gradient */
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        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];
            }
        }
        
        /* 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);
            
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            for (i=i1-FILTSIZE;i<=i1+FILTSIZE;i++){
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                for (j=j1-FILTSIZE;j<=j1+FILTSIZE;j++){
                    if ((POS[1]==((i-1)/NX)) && (POS[2]==((j-1)/NY))){
                        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]);
                         waveconvtmp[jj][ii] = waveconvtmp[jj][ii]/49;*/
                        if (jj>0){
                            waveconvtmp[jj][ii] = 0.0;
                            taper_coeff[jj][ii] = 0.0;
                        }
                    }
                }
            }
            
            
        }
        
        
        /*for (n=1;n<=ntr;n++)
         {
         i1 = recpos[1][n];
         j1 = recpos[2][n];
         
         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;   */
        /* Die kommenden 4 Zeilen wurden von Daniel auskommentiert. 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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        /*	waveconvtmp[jj][ii] = 0.0;
         
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		       }
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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] = 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_grid (printed by PE %d):\n",MYID);
            fprintf(FP," Coefficients for gradient taper are now calculated.\n");
        }
        
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        if(sws==4){
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            sprintf(taper_file,"%s",TAPER_FILE_NAME);
            fp_taper=fopen(taper_file,"r");
        }
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        if(sws==5){
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            sprintf(taper_file,"%s",TAPER_FILE_NAME_U);
            fp_taper=fopen(taper_file,"r");
        }
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        if(sws==6){
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            sprintf(taper_file,"%s",TAPER_FILE_NAME_RHO);
            fp_taper=fopen(taper_file,"r");
        }
        
        if(fp_taper==NULL) {
            err("Taper file could not 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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}