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sentinel.sar.cross.section.reduce.c
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sentinel.sar.cross.section.reduce.c
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/*
* This program is designed to smooth a radar cross section field using
* a binomial smoother similar to that of Koch (TGRS 2004). The Sentinel
* scene is assumed to be in netCDF format (i.e., following a conversion
* from SAFE format) - RD July 2005, September 2016.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <math.h>
#include "/home/ricani/prog/include.netcdf/include/cdcnetcdf.h"
#define LEN 200
#define LOTS 2000
#define MISSING -9e9 /* generic missing value */
#define DELMISS -8e9 /* generic missing value comparison */
double **alloc_dblmatrix(int nrows, int ncols);
float **alloc_flmatrix(int nrows, int ncols);
void free_dblmatrix(double **matrix, int nrows, int ncols);
void free_flmatrix(float **matrix, int nrows, int ncols);
main(int argc, char *argv[])
{
FILE *fpa, *fpb, *fpc, *fopen();
char infila[LEN], infilb[LEN], infilc[LEN], outfile[LEN], line[LEN],
stema[LEN], stemb[LEN], date[LEN], resolution[LEN], command[LEN];
int a, b, c, d, nlines, npixels, subscenesize, reduce, gridint, aziblocks, rngblocks,
startline_valid, numlines_valid, stopline_valid, midline, linenum, subscene_centreline,
startpixel_valid, numpixels_valid, stopixel_valid, midpixel, joffset, subscene_centrepixel,
nlines2skipbeg, nlines2skipend, npixels2skipbeg, npixels2skipend;
double pixel_spacing, sum, count, resol, ullat, ullon, urlat, urlon, lllat, lllon, lrlat, lrlon,
firstline_latitude_firstpixel, firstline_latitude_lastpixel, lastline_latitude_firstpixel,
lastline_latitude_lastpixel, firstline_longitude_firstpixel, firstline_longitude_lastpixel,
lastline_longitude_firstpixel, lastline_longitude_lastpixel, **smoo, smoosum;
float tmpval, **sigo, **angl, **land, **lats, **lons, **ssigo, **sangl, **sland, **slats, **slons, *array;
if (argc != 3) {
printf("\nUsage: %s 2005-05-16_49750_01.00800.hdr reduction_factor\n",argv[0]);
printf(" where a reduction factor of 2 (3) yields 1/4 (1/8) the number of gridboxes\n\n");
exit(1);
}
sscanf(argv[2],"%d",&reduce);
if (reduce == 0) {
printf("\nUsage: %s 2005-05-16_49750_01.00800.hdr reduction_factor\n",argv[0]);
printf(" where the reduction factor should be greater than 0\n\n");
exit(1);
}
strcpy(stema,argv[1]); stema[25] = '\0'; /* create the file names */
strcpy(stemb,argv[1]); stemb[19] = '\0';
strcpy(infila,argv[1]);
strcpy(infilb,stema);
strcat(infilb,".sar.nc");
pixel_spacing = atoi(stema+20);
if (pixel_spacing == 12 || pixel_spacing == 13)
pixel_spacing = 12.5;
strcpy(infila,argv[1]); /* read the header info */
if ((fpa = fopen(infila,"r")) == NULL) {
printf("couldn't open %s\n",argv[1]);
exit(1);
}
for (a = 0; a < 27; a++) {
fgets(line,LEN,fpa);
if (a == 9) sscanf(line,"%*s %*s %*s %s",date);
if (a == 24) sscanf(line,"%*s %d",&nlines);
if (a == 25) sscanf(line,"%*s %d",&npixels);
}
fclose(fpa);
gridint = pow(2.0,reduce); /* determine the new resol */
subscenesize = 1; /* relative to the old, and */
for (a = 1; a <= reduce; a++) /* the size of the desired */
subscenesize += 2.0 * pow(2.0,(double)a); /* smoothing matrix */
aziblocks = (nlines - subscenesize) / gridint + 1; /* then get the desired */
rngblocks = (npixels - subscenesize) / gridint + 1; /* number of subscenes */
numlines_valid = (aziblocks - 1) * gridint + subscenesize; /* in azimuth and range */
numpixels_valid = (rngblocks - 1) * gridint + subscenesize; /* and allocate some memory */
startline_valid = (nlines - numlines_valid) / 2 + 1;
stopline_valid = numlines_valid + startline_valid - 1;
startpixel_valid = (npixels - numpixels_valid) / 2 + 1;
stopixel_valid = numpixels_valid + startpixel_valid - 1;
nlines2skipbeg = startline_valid - 1;
nlines2skipend = nlines - stopline_valid;
npixels2skipbeg = startpixel_valid - 1;
npixels2skipend = npixels - stopixel_valid;
printf("\nreduce power %d\n",reduce);
printf("new grid int %d\n",gridint);
printf("subscenesize %d\n",subscenesize);
printf("aziblocks %d\n",aziblocks);
printf("rngblocks %d\n",rngblocks);
printf("nlines2skipbeg %10d npixels2skipbeg %10d\n",nlines2skipbeg,npixels2skipbeg);
printf("startline_valid %10d startpixel_valid %10d\n",startline_valid,startpixel_valid);
printf("numlines_valid %10d numpixels_valid %10d\n",numlines_valid,numpixels_valid);
printf("stopline_valid %10d stopixel_valid %10d\n",stopline_valid,stopixel_valid);
printf("nlines2skipend %10d npixels2skipend %10d\n",nlines2skipend,npixels2skipend);
printf("nlines %10d npixels %10d\n\n",nlines,npixels);
smoo = alloc_dblmatrix(subscenesize,subscenesize);
sigo = alloc_flmatrix(nlines,npixels);
angl = alloc_flmatrix(nlines,npixels);
land = alloc_flmatrix(nlines,npixels);
lats = alloc_flmatrix(nlines,npixels);
lons = alloc_flmatrix(nlines,npixels);
ssigo = alloc_flmatrix(aziblocks,rngblocks);
sangl = alloc_flmatrix(aziblocks,rngblocks);
sland = alloc_flmatrix(aziblocks,rngblocks);
slats = alloc_flmatrix(aziblocks,rngblocks);
slons = alloc_flmatrix(aziblocks,rngblocks);
array = (float *)calloc(nlines*npixels,sizeof(float));
sprintf(infilc, /* next read the */
"/home/ricani/prog/format.ccrs/include/conv.kernel.%d",reduce); /* convolution kernel */
if ((fpb = fopen(infilc,"r")) == NULL) { /* (and normalize it) */
printf("ERROR opening %s\n",infilc);
exit(1);
}
printf("reading %s\n\n",infilc);
count = 0;
for (a = 0; a < subscenesize; a++)
for (b = 0; b < subscenesize; b++) {
fscanf(fpb,"%lf",&smoo[a][b]);
count += smoo[a][b];
}
fclose(fpb);
/* for (a = 0; a < subscenesize; a++)
for (b = 0; b < subscenesize; b++)
smoo[a][b] /= count; */
sarread(infilb, "sigo", date, array, nlines*npixels);
d = 0; for (a = 0; a < nlines; a++) for (b = 0; b < npixels; b++) {sigo[a][b] = array[d]; d++;}
sarread(infilb, "angl", date, array, nlines*npixels);
d = 0; for (a = 0; a < nlines; a++) for (b = 0; b < npixels; b++) {angl[a][b] = array[d]; d++;}
sarread(infilb, "land", date, array, nlines*npixels);
d = 0; for (a = 0; a < nlines; a++) for (b = 0; b < npixels; b++) {land[a][b] = array[d]; d++;}
sarread(infilb, "lats", date, array, nlines*npixels);
d = 0; for (a = 0; a < nlines; a++) for (b = 0; b < npixels; b++) {lats[a][b] = array[d]; d++;}
sarread(infilb, "lons", date, array, nlines*npixels);
d = 0; for (a = 0; a < nlines; a++) for (b = 0; b < npixels; b++) {lons[a][b] = array[d]; d++;}
printf("\n");
for (a = 0; a < aziblocks; a++) /* calculate smoothed values */
for (b = 0; b < rngblocks; b++) { /* for each range and azimuth */
sum = smoosum = 0; /* set sigo to missing if */
midline = nlines2skipbeg + (subscenesize - 1) / 2 + gridint * a; /* central value is undefined */
midpixel = npixels2skipbeg + (subscenesize - 1) / 2 + gridint * b;
if (sigo[midline][midpixel] > DELMISS) {
for (c = 0; c < subscenesize; c++)
for (d = 0; d < subscenesize; d++) {
tmpval = sigo[c+midline-(subscenesize-1)/2][d+midpixel-(subscenesize-1)/2];
if (tmpval > DELMISS) {
sum += smoo[c][d] * pow(10.0,tmpval/10.0);
smoosum += smoo[c][d];
}
}
}
if (sum <= 0)
ssigo[a][b] = MISSING;
else
ssigo[a][b] = 10.0 * log10(sum/smoosum);
}
for (a = 0; a < aziblocks; a++) /* loop through the data */
for (b = 0; b < rngblocks; b++) { /* again to get locations */
midline = nlines2skipbeg + (subscenesize - 1) / 2 + gridint * a; /* of the subsampled data */
midpixel = npixels2skipbeg + (subscenesize - 1) / 2 + gridint * b;
sland[a][b] = land[midline][midpixel];
slats[a][b] = lats[midline][midpixel];
slons[a][b] = lons[midline][midpixel];
sangl[a][b] = angl[midline][midpixel];
}
resol = pixel_spacing * pow(2.0,reduce);
if (resol >= 10000) /* create an output file */
sprintf(resolution,"%.0f",(float)resol); /* and store the fields */
else if (resol >= 1000) /* correctly oriented */
sprintf(resolution,"0%.0f",(float)resol);
else if (resol >= 100)
sprintf(resolution,"00%.0f",(float)resol);
else if (resol >= 10)
sprintf(resolution,"000%.0f",(float)resol);
else if (resol >= 1)
sprintf(resolution,"0000%.0f",(float)resol);
else strcpy(resolution,"00000");
sprintf(outfile,"%s.%s.sar.nc",stemb,resolution);
sprintf(command,"/home/ricani/bin/nc.template.sar %s %s %d %d\n",
outfile,date,aziblocks,rngblocks);
printf("%s", command);
system(command);
printf("\n");
d = 0; for (a = 0; a < aziblocks; a++) for (b = 0; b < rngblocks; b++) {array[d] = ssigo[a][b]; d++;}
sarwrite(outfile, "sigo", date, array, aziblocks*rngblocks);
d = 0; for (a = 0; a < aziblocks; a++) for (b = 0; b < rngblocks; b++) {array[d] = sangl[a][b]; d++;}
sarwrite(outfile, "angl", date, array, aziblocks*rngblocks);
d = 0; for (a = 0; a < aziblocks; a++) for (b = 0; b < rngblocks; b++) {array[d] = sland[a][b]; d++;}
sarwrite(outfile, "land", date, array, aziblocks*rngblocks);
d = 0; for (a = 0; a < aziblocks; a++) for (b = 0; b < rngblocks; b++) {array[d] = slats[a][b]; d++;}
sarwrite(outfile, "lats", date, array, aziblocks*rngblocks);
d = 0; for (a = 0; a < aziblocks; a++) for (b = 0; b < rngblocks; b++) {array[d] = slons[a][b]; d++;}
sarwrite(outfile, "lons", date, array, aziblocks*rngblocks);
ullat = slats[0][0]; ullon = slons[0][0];
urlat = slats[0][rngblocks-1]; urlon = slons[0][rngblocks-1];
lllat = slats[aziblocks-1][0]; lllon = slons[aziblocks-1][0];
lrlat = slats[aziblocks-1][rngblocks-1]; lrlon = slons[aziblocks-1][rngblocks-1];
sarread(infilb, "lat", date, array, nlines); /* also transfer arbitrary netCDF */
d = 0; for (a = 0; a < nlines; a++) {lats[a][0] = array[d]; d++;} /* lats and lons (subsampled) in */
sarread(infilb, "lon", date, array, npixels); /* order to maintain hdr mappings */
d = 0; for (b = 0; b < npixels; b++) {lons[0][b] = array[d]; d++;}
for (a = 0; a < aziblocks; a++) {
midline = nlines2skipbeg + (subscenesize - 1) / 2 + gridint * a;
slats[a][0] = lats[midline][0];
}
for (b = 0; b < rngblocks; b++) {
midpixel = npixels2skipbeg + (subscenesize - 1) / 2 + gridint * b;
slons[0][b] = lons[0][midpixel];
}
d = 0; for (a = 0; a < aziblocks; a++) {array[d] = slats[a][0]; d++;}
sarwrite(outfile, "lat", date, array, aziblocks);
d = 0; for (b = 0; b < rngblocks; b++) {array[d] = slons[0][b]; d++;}
sarwrite(outfile, "lon", date, array, rngblocks);
printf("\n");
free_dblmatrix(smoo,subscenesize,subscenesize); /* free allocated memory */
free_flmatrix(sigo,nlines,npixels);
free_flmatrix(angl,nlines,npixels);
free_flmatrix(land,nlines,npixels);
free_flmatrix(lats,nlines,npixels);
free_flmatrix(lons,nlines,npixels);
free_flmatrix(ssigo,aziblocks,rngblocks);
free_flmatrix(sangl,aziblocks,rngblocks);
free_flmatrix(sland,aziblocks,rngblocks);
free_flmatrix(slats,aziblocks,rngblocks);
free_flmatrix(slons,aziblocks,rngblocks);
free(array);
sprintf(outfile,"%s.%s.hdr",stemb,resolution); /* and store hdr metadata */
printf("reading %s\nwriting %s\n\n",infila,outfile);
if ((fpa = fopen(infila,"r")) == NULL || (fpc = fopen(outfile,"w")) == NULL) {
printf("\n\n***Error opening %s or %s\n\n",infila,outfile);
exit(1);
}
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56s\n","ProductID",infilb);
for (a = 0; a < 9; a++) {
fgets(line,LEN,fpa); fprintf(fpc,"%s",line);
}
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56f\n","UpperLeft_Latitude",ullat);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56f\n","UpperLeft_Longitude",ullon);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56f\n","UpperRight_Latitude",urlat);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56f\n","UpperRight_Longitude",urlon);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56f\n","LowerLeft_Latitude",lllat);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56f\n","LowerLeft_Longitude",lllon);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56f\n","LowerRight_Latitude",lrlat);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56f\n","LowerRight_Longitude",lrlon);
for (a = 0; a < 2; a++) {
fgets(line,LEN,fpa); fprintf(fpc,"%s",line);
}
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56d\n","StartLineValid",startline_valid);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56d\n","StopLineValid",stopline_valid);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56d\n","StartPixelValid",startpixel_valid);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56d\n","StopPixelValid",stopixel_valid);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56d\n","NumAzimuthSubScenes",aziblocks);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56d\n","NumRangeSubScenes",rngblocks);
fgets(line,LEN,fpa); fprintf(fpc,"%-23s%-56d\n","SubSceneSize",subscenesize);
for (a = 0; a < 4; a++) {
fgets(line,LEN,fpa); fprintf(fpc,"%s",line);
}
fclose(fpa);
fclose(fpc);
exit(0);
}
double **alloc_dblmatrix(int nrows, int ncols)
{
int i, j;
double **matrix;
if ((matrix = (double **)calloc((size_t)(nrows),sizeof(double *))) == NULL) {
printf("*** Error 1 using calloc in alloc_dblmatrix\n");
exit(1);
}
for (i = 0; i < nrows; i++) {
if ((matrix[i] = (double *)calloc((size_t)(ncols),sizeof(double))) == NULL) {
printf("*** Error 2 using calloc in alloc_dblmatrix\n");
for (j = 0; j < i; j++)
free(matrix[j]);
free(matrix);
exit(1);
}
}
return matrix;
}
float **alloc_flmatrix(int nrows, int ncols)
{
int i, j;
float **matrix;
if ((matrix = (float **)calloc((size_t)(nrows),sizeof(float *))) == NULL) {
printf("*** Error 1 using calloc in alloc_flmatrix\n");
exit(1);
}
for (i = 0; i < nrows; i++) {
if ((matrix[i] = (float *)calloc((size_t)(ncols),sizeof(float))) == NULL) {
printf("*** Error 2 using calloc in alloc_flmatrix\n");
for (j = 0; j < i; j++)
free(matrix[j]);
free(matrix);
exit(1);
}
}
return matrix;
}
void free_dblmatrix(double **matrix, int nrows, int ncols)
{
int i;
for (i = nrows-1; i >= 0; i--)
free(matrix[i]);
free(matrix);
}
void free_flmatrix(float **matrix, int nrows, int ncols)
{
int i;
for (i = 0; i < nrows; i++ )
free(matrix[i]);
free(matrix);
}