int calc_zoomLevel(int pixel, double kilometers) {
return calc_zoomLevel_res(calc_resolution(pixel, kilometers));
}
int main(int argc, char *argv[])
{
char szImg[255], szImage[255], buffer[1000], crID[10], szCrList[255], szOut[255];
int ii, kk, size, bigSize=oversampling_factor*srcSize;
int mainlobe_azimuth_min, mainlobe_azimuth_max, mainlobe_range_min;
int mainlobe_range_max, sidelobe_azimuth_min, sidelobe_azimuth_max;
int sidelobe_range_min, sidelobe_range_max, peak_line, peak_sample;
float azimuth_processing_bandwidth, chirp_rate, pulse_duration, sampling_rate;
float prf, srcPeakX, srcPeakY, bigPeakX, bigPeakY, clutter_power, peak_power, scr;
float azimuth_resolution, range_resolution, azimuth_pslr, range_pslr;
float azimuth_window_size, range_window_size;
float azimuth_profile[bigSize], range_profile[bigSize];
static complexFloat *s, *t;
double lat, lon, elev, posX, posY, look_angle;
FILE *fpIn, *fpOut, *fp, *fpText;
meta_parameters *meta, *meta_debug;
float *original_amplitude, *amplitude, *phase;
fcpx *src_fft, *trg_fft;
int debug=FALSE;
char *text=NULL;
int overwrite=FALSE;
if (argc==1) usage();
if (strcmp(argv[1],"-help")==0) help_page(); /* exits program */
if (strcmp(argv[1],"-overwrite")==0) overwrite=TRUE;
int required_args = 4;
if (overwrite) ++required_args;
if(argc != required_args)
usage();/*This exits with a failure*/
/* Fetch required arguments */
strcpy(szImg, argv[argc - 3]);
strcpy(szCrList,argv[argc - 2]);
strcpy(szOut,argv[argc - 1]);
/* DEFAULT VALUES:
size of region to oversample - 64 pixels
mainlobe width factor - 2.6
sidelobe width factor - 20.0
maximum oversampling factor - 8
*/
// Read metadata
sprintf(szImage, "%s.img", szImg);
meta = meta_read(szImage);
lines = meta->general->line_count;
samples = meta->general->sample_count;
text = (char *) MALLOC(255*sizeof(char));
// Handle input and output file
fpIn = FOPEN(szCrList, "r");
fpOut = FOPEN(szOut, "w");
fprintf(fpOut, "POINT TARGET ANALYSIS RESULTS\n\n");
fprintf(fpOut, "CR\tLat\tLon\tElev\tAz peak\tRng peak\tLook\t"
"Az res\tRng res\tAz PSLR\tRng PSLR\tSCR\n");
// RCS needs some more coding
// Loop through corner reflector location file
while (fgets(buffer, 1000, fpIn))
{
if (overwrite) {
sscanf(buffer, "%s\t%lf\t%lf", crID, &posY, &posX);
printf(" %s: posX = %.2lf, posY = %.2lf\n", crID, posX, posY);
}
else {
sscanf(buffer, "%s\t%lf\t%lf\t%lf", crID, &lat, &lon, &elev);
meta_get_lineSamp(meta, lat, lon, elev, &posY, &posX);
printf(" %s: lat = %.4lf, lon = %.4lf, posX = %.2lf, posY = %.2lf\n",
crID, lat, lon, posX, posY);
}
// Check bounds - Get average spectra from chip in range direction
if (!(outOfBounds(posX, posY, srcSize)))
{
// READ SUBSET FROM THE IMAGE WITH CORNER REFLECTOR IN THE CENTER
size = srcSize*srcSize*sizeof(float);
original_amplitude = (float *) MALLOC(size);
phase = (float *) MALLOC(size);
s = (complexFloat *) MALLOC(2*size);
readComplexSubset(szImage, srcSize, srcSize, posX-srcSize/2,
posY-srcSize/2, s);
my_complex2polar(s, srcSize, srcSize, original_amplitude, phase);
if (debug) { // Store original image for debugging
fp = FOPEN("original.img", "wb");
size = bigSize*bigSize*sizeof(float);
FWRITE(original_amplitude, size, 1, fp);
FCLOSE(fp);
meta_debug = meta_init(szImage);
meta_debug->general->line_count =
meta_debug->general->sample_count = srcSize;
meta_debug->general->data_type = REAL32;
meta_debug->general->start_line = posY-srcSize/2;
meta_debug->general->start_sample = posX-srcSize/2;
meta_debug->general->center_latitude = lat;
meta_debug->general->center_longitude = lon;
meta_write(meta_debug, "original.meta");
meta_free(meta_debug);
}
// Find amplitude peak in original image chip
if (!findPeak(original_amplitude, srcSize, &srcPeakX, &srcPeakY)) {
fprintf(fpOut,
" Could not find amplitude peak in original image chip!\n");
goto SKIP;
}
// Cut out the subset again around the peak to make sure we have data for
// the analysis
readComplexSubset(szImage, srcSize, srcSize, posX-srcSize+srcPeakY,
posY-srcSize+srcPeakX, s);
my_complex2polar(s, srcSize, srcSize, original_amplitude, phase);
FREE(phase);
findPeak(original_amplitude, srcSize, &srcPeakX, &srcPeakY);
// Determine look angle
look_angle =
meta_look(meta, srcSize/2, srcSize/2);
/****************************
- special ScanSAR case: images are "projected" - need to be rotated back to
allow analysis in azimuth and range direction (ss_extract.c)
*********************/
// BASEBAND THE DATA IN EACH DIMENSION IN THE FREQUENCY DOMAIN
// Oversample image
src_fft = forward_fft(s, srcSize, srcSize);
trg_fft = oversample(src_fft, srcSize, oversampling_factor);
// Determine azimuth and range window size
azimuth_processing_bandwidth =
(float) meta->sar->azimuth_processing_bandwidth;
prf = (float) meta->sar->prf;
chirp_rate = (float) meta->sar->chirp_rate;
pulse_duration = (float) meta->sar->pulse_duration;
sampling_rate = (float) meta->sar->range_sampling_rate;
azimuth_window_size = azimuth_processing_bandwidth / prf;
range_window_size = fabs(chirp_rate) * pulse_duration / sampling_rate;
printf("azimuth window size: %.2f, range window size: %.2f\n",
azimuth_window_size, range_window_size);
asfRequire(azimuth_window_size > 0.0 && azimuth_window_size < 1.0,
"azimuth window size out of range (0 to 1)!\n");
asfRequire(range_window_size > 0.0 && range_window_size < 1.0,
"range window size out of range (0 to 1)!\n");
if (range_window_size < 0.5)
range_window_size = 0.5;
// for ScanSAR both 0.5
// run debugger to check units are correct!
// Baseband image in range direction
//baseband(src_fft, range_window_size);
/*
// Transpose matrix to work in azimuth direction
//transpose(s);
// Baseband image in azimuth direction
// baseband(s, azimuth_window_size);
// Transpose matrix back into original orientation
//transpose(s);
*/
t = inverse_fft(trg_fft, bigSize, bigSize);
amplitude = (float *) MALLOC(sizeof(float)*bigSize*bigSize);
phase = (float *) MALLOC(sizeof(float)*bigSize*bigSize);
my_complex2polar(t, bigSize, bigSize, amplitude, phase);
FREE(phase);
if (debug) { // Store oversampled image for debugging
fp = FOPEN("oversample.img", "wb");
size = bigSize*bigSize*sizeof(float);
FWRITE(amplitude, size, 1, fp);
FCLOSE(fp);
meta_debug = meta_init("oversample.meta");
meta_debug->general->line_count =
meta_debug->general->sample_count = bigSize;
meta_debug->general->data_type = REAL32;
meta_write(meta_debug, "oversample.meta");
meta_free(meta_debug);
}
// Find the amplitude peak in oversampled image
if (!findPeak(amplitude, bigSize, &bigPeakX, &bigPeakY)) {
fprintf(fpOut,
" Could not find amplitude peak in oversampled image chip!\n");
goto SKIP;
}
peak_line = (int)(bigPeakX + 0.5);
peak_sample = (int)(bigPeakY + 0.5);
// Write text version of oversampled image
sprintf(text, "%s_%s_chip.txt", szImg, crID);
fpText = FOPEN(text, "w");
for (ii=peak_line-32; ii<peak_line+32; ii++) {
for (kk=peak_sample-32; kk<peak_sample+32; kk++)
fprintf(fpText, "%12.4f\t", amplitude[ii*bigSize+kk]);
fprintf(fpText, "\n");
}
FCLOSE(fpText);
// EXTRACTING PROFILES IN AZIMUTH AND RANGE THROUGH PEAK
for (ii=0; ii<bigSize; ii++) {
azimuth_profile[ii] = amplitude[ii*bigSize+peak_sample];
range_profile[ii] = amplitude[bigSize*peak_line+ii];
}
sprintf(text, "%s_%s_azimuth.txt", szImg, crID);
fp = FOPEN(text, "w");
fprintf(fp, "Azimuth profile\n");
for (ii=0; ii<bigSize; ii++)
fprintf(fp, "%.3f\n", azimuth_profile[ii]);
FCLOSE(fp);
sprintf(text, "%s_%s_range.txt", szImg, crID);
fp = FOPEN(text, "w");
fprintf(fp, "Range profile\n");
for (ii=0; ii<bigSize; ii++)
fprintf(fp, "%.3f\n", range_profile[ii]);
FCLOSE(fp);
// FINALLY GET TO THE IMAGE QUALITY PARAMETERS
clutter_power = 0.0;
// Find main lobes in oversampled image
if (!find_mainlobe(amplitude, azimuth_profile, bigSize, peak_line,
clutter_power, &mainlobe_azimuth_min,
&mainlobe_azimuth_max)) {
fprintf(fpOut, " No mainlobes could be found for %s in azimuth!\n",
crID);
goto SKIP;
}
//printf("mainlobe azimuth: min = %d, max = %d\n",
// mainlobe_azimuth_min, mainlobe_azimuth_max);
if (!find_mainlobe(amplitude, range_profile, bigSize, peak_sample,
clutter_power, &mainlobe_range_min,
&mainlobe_range_max)) {
fprintf(fpOut, " No mainlobes could be found for %s in range!\n", crID);
goto SKIP;
}
//printf("mainlobe range: min = %d, max = %d\n",
// mainlobe_range_min, mainlobe_range_max);
// Calculate resolution in azimuth and range for profiles
if (!calc_resolution(azimuth_profile, mainlobe_azimuth_min,
mainlobe_azimuth_max, peak_line,
meta->general->y_pixel_size, clutter_power,
&azimuth_resolution))
fprintf(fpOut, " Negative azimuth resolution for %s - invalid result!"
"\n", crID);
//printf("azimuth resolution = %.2f\n", azimuth_resolution);
if (!calc_resolution(range_profile, mainlobe_range_min,
mainlobe_range_max, peak_sample,
meta->general->x_pixel_size, clutter_power,
&range_resolution))
fprintf(fpOut, " Negative range resolution for %s - invalid result!\n",
crID);
//printf("range resolution = %.2f\n", range_resolution);
// Find peak of original data - thought we had that already: check !!!
// Calculate the clutter power
azimuth_resolution /= meta->general->x_pixel_size;
range_resolution /= meta->general->y_pixel_size;
clutter_power =
calc_clutter_power(original_amplitude, srcSize, peak_sample, peak_line,
azimuth_resolution, range_resolution);
//printf(" Clutter power: %8.3f\n", clutter_power);
// Calculate resolution in azimuth and range with estimated clutter power
if (!calc_resolution(azimuth_profile, mainlobe_azimuth_min,
mainlobe_azimuth_max, peak_line,
meta->general->y_pixel_size, clutter_power,
&azimuth_resolution))
fprintf(fpOut, " Negative azimuth resolution for %s - invalid result!"
"\n", crID);
if (!calc_resolution(range_profile, mainlobe_range_min,
mainlobe_range_max, peak_sample,
meta->general->x_pixel_size, clutter_power,
&range_resolution))
fprintf(fpOut, " Negative range resolution for %s - invalid result!\n",
crID);
//printf(" Azimuth resolution: %.3f\n", azimuth_resolution);
//printf(" Range resolution: %.3f\n", range_resolution);
// Find sidelobes in oversampled image and calculate the point-to-sidelobe
// ratio in azimuth and range direction
if (find_sidelobe(azimuth_profile, bigSize, 1, peak_line,
mainlobe_azimuth_max, &sidelobe_azimuth_max) &&
find_sidelobe(azimuth_profile, bigSize, -1, peak_line,
mainlobe_azimuth_min, &sidelobe_azimuth_min)) {
if (!calc_pslr(azimuth_profile, bigSize, peak_line, sidelobe_azimuth_min,
sidelobe_azimuth_max, &azimuth_pslr))
//printf(" Azimuth PSLR: %.3f\n", azimuth_pslr);
//printf(" No valid PSLR in azimuth could be determined!\n");
;
}
else {
fprintf(fpOut, " Problem in finding sidelobes for %s in azimuth - "
"invalid PSLR!\n", crID);
}
if (find_sidelobe(range_profile, bigSize, 1, peak_sample,
mainlobe_range_max, &sidelobe_range_max) &&
find_sidelobe(range_profile, bigSize, -1, peak_sample,
mainlobe_range_min, &sidelobe_range_min)) {
if (!calc_pslr(range_profile, bigSize, peak_sample, sidelobe_range_min,
sidelobe_range_max, &range_pslr))
//printf(" Range PSLR: %.3f\n", range_pslr);
//printf(" No valid PSLR in range could be determined!\n");
;
}
else {
fprintf(fpOut, " Problem in finding sidelobes for %s in range -"
" invalid PSLR!\n", crID);
}
//printf("sidelobe_azimuth: min = %d, max = %d\n",
// sidelobe_azimuth_min, sidelobe_azimuth_max);
//printf("sidelobe_range: min = %d, max = %d\n",
// sidelobe_range_min, sidelobe_range_max);
// Calculate the signal-to-clutter ratio (SCR)
peak_power = amplitude[peak_line*bigSize+peak_sample] *
amplitude[peak_line*bigSize+peak_sample];
if (clutter_power>0 && peak_power>clutter_power)
scr = 10 * log((peak_power - clutter_power)/clutter_power);
else
scr = 0.0;
if (peak_power > 0.0) {
peak_power = 10 * log(peak_power);
//printf(" Peak power: %.3f\n", peak_power);
//printf(" SCR: %.3f\n", scr);
}
else
fprintf(fpOut, " Negative peak power - invalid result!\n");
FREE(amplitude);
FREE(original_amplitude);
// Write values in output files
fprintf(fpOut, "%s\t%.4lf\t%.4lf\t%.1lf\t%.1lf\t%.1f\t%.3f\t"
"%.3f\t%.3f\t%.3f\t%.3f\t%.3f\n",
crID, lat, lon, elev, posX-srcSize+srcPeakY, posY-srcSize+srcPeakX,
look_angle*R2D, azimuth_resolution, range_resolution, azimuth_pslr,
range_pslr, scr);
SKIP: continue;
}
else
fprintf(fpOut, "\n WARNING: Target %s outside the image boundaries!\n",
crID);
}
FCLOSE(fpIn);
FCLOSE(fpOut);
FREE(meta);
return(0);
}
