3 This is the TRMM Office Radar Software Library.
4 Copyright (C) 1996 Paul A. Kucera of Applied Research Corporation,
5 Landover, Maryland, a NASA/GSFC on-site contractor.
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public
18 License along with this library; if not, write to the Free
19 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 /*************************************************************/
23 /* Function: nsig_to_radar.c */
26 /* Applied Research Corporation */
30 /* Modifications by: */
32 /* Space Applications Corporation */
36 /* Started: 08 AUG 96 */
38 /* Derived from Paul Kucera's nsig_to_radar.c */
40 /*************************************************************/
54 extern int radar_verbose_flag;
55 extern int rsl_qfield[]; /* See RSL_select_fields */
57 /* We need this entry for various things esp in Ray_header */
58 #define MISSING_HEADER_DATA -9999
59 /* The following is speed of light _in_ _air_ ! */
60 #define SPEED_OF_LIGHT 299702547
61 #define MIT_BEAMWIDTH 1.65
62 #define TOG_BEAMWIDTH 1.65
63 #define KWA_BEAMWIDTH 1.0
64 #define DEFAULT_BEAMWIDTH 1.0
65 #define NSIG_NO_DATA -1
66 #define MAX_NSIG_SWEEPS 30
67 #define MAX_NSIG_RAYS 400
68 #define NSIG_NO_ECHO -32.0
69 #define NSIG_NO_ECHO2 -999.0
71 static float (*f)(Range x);
72 static Range (*invf)(float x);
76 void get_extended_header_info(NSIG_Sweep **nsig_sweep, int xh_size, int iray,
78 int *msec, float *azm, float *elev,
79 float *pitch, float *roll, float *heading,
80 float *azm_rate, float *elev_rate,
81 float *pitch_rate, float *roll_rate,
83 float *lat, float *lon, int *alt, float *rvc,
84 float *vel_east, float *vel_north, float *vel_up)
86 static NSIG_Ext_header_ver1 xh;
89 *msec = *azm = *elev = *pitch = *roll = *heading =
90 *azm_rate = *elev_rate = *pitch_rate = *roll_rate = *heading_rate =
91 *lat = *lon = *alt = *rvc = 0;
93 /* Determine where 'itype' for extended header is. */
94 for (itype = 0; itype<nparams; itype++) {
95 data_type = NSIG_I2(nsig_sweep[itype]->idh.data_type);
96 if (data_type == NSIG_DTB_EXH) break;
98 /* printf("...extended header itype=%d, nparams=%d\n", itype, nparams); */
99 if (itype == nparams) return; /* No extended header. */
102 if (nsig_sweep[itype]->ray[iray] == NULL) return;
103 if (nsig_sweep[itype]->ray[iray]->range == NULL) return;
104 memmove(&xh, nsig_sweep[itype]->ray[iray]->range, sizeof(xh));
105 *msec = NSIG_I4(xh.msec);
106 /* printf("...extended header msec= %d\n", *msec); */
107 if (xh_size <= 20) /* Stop, only have version 0. */
110 /* Version 1 processing. */
111 *azm = nsig_from_bang(xh.azm);
112 *elev = nsig_from_bang(xh.elev);
113 *pitch = nsig_from_bang(xh.pitch);
114 *roll = nsig_from_bang(xh.roll);
115 *heading = nsig_from_bang(xh.heading);
116 *azm_rate = nsig_from_bang(xh.azm_rate);
117 *elev_rate = nsig_from_bang(xh.elev_rate);
118 *pitch_rate = nsig_from_bang(xh.pitch_rate);
119 *roll_rate = nsig_from_bang(xh.roll_rate);
123 *heading_rate = nsig_from_bang(xh.heading_rate);
125 *lat = nsig_from_fourb_ang(xh.lat);
126 *lon = nsig_from_fourb_ang(xh.lon);
127 if(*lat > 180.0) *lat -= 360.0;
128 if(*lon > 180.0) *lon -= 360.0;
129 *alt = NSIG_I2(xh.alt);
130 *rvc = NSIG_I2(xh.rad_vel_cor)/100.0; /* cm to m */
131 *vel_east = NSIG_I2(xh.vel_e)/100.0; /* cm to m */
132 *vel_north = NSIG_I2(xh.vel_n)/100.0; /* cm to m */
133 *vel_up = NSIG_I2(xh.vel_u)/100.0; /* cm to m */
152 int year, month, day;
153 int hour, minute, sec;
154 int numbins, numsweep;
155 int num_rays, sea_lvl_hgt;
156 int radar_number, num_samples;
157 int latd, latm, lats, lond, lonm, lons;
160 int sweep_year, sweep_day, sweep_month;
161 int sweep_hour, sweep_minute, sweep_second;
163 int z_flag_unc, z_flag_cor, v_flag, w_flag, speckle;
168 float prf, prf2, wave, beam_width;
170 float prf_modes[] = {1.0, 2.0/3.0, 3.0/4.0, 4.0/5.0};
171 float vert_half_bw, horz_half_bw;
173 float rng_first_bin, freq;
174 float max_vel, sweep_rate, azim_rate;
178 float sqi, log, csr, sig, cal_dbz;
179 char radar_type[50], state[2], city[15];
181 NSIG_Product_file *prod_file;
183 int data_mask, nrays;
185 int nparams, nsweeps;
186 NSIG_Sweep **nsig_sweep;
189 unsigned short nsig_2byte; /* New for 2-byte data types, Aug 2009 */
193 float azm, elev, pitch, roll, heading, azm_rate, elev_rate,
194 pitch_rate, roll_rate, heading_rate,
196 int alt; /* Altitude */
197 float rvc; /* Radial correction velocity m/s */
198 float vel_east, vel_north, vel_up; /* Platform velocity vectors m/sec */
201 extern int *rsl_qsweep; /* See RSL_read_these_sweeps in volume.c */
202 extern int rsl_qsweep_max;
203 extern float rsl_kdp_wavelen;
206 if (radar_verbose_flag)
207 fprintf(stderr, "open file: %s\n", filename);
209 /** Opening nsig file **/
210 if((fp = nsig_open(filename)) == NULL) return NULL;
213 sprintf(radar_type, "nsig2");
214 radar_number = 22; /** Arbitrary number given to nsig2 data **/
216 sprintf(radar_type, "nsig");
217 radar_number = 21; /* What are these suppose to be? */
224 prod_file = (NSIG_Product_file *)calloc(1, sizeof(NSIG_Product_file));
226 n = nsig_read_record(fp, (char *)&prod_file->rec1);
227 nsig_endianess(&prod_file->rec1);
228 if (radar_verbose_flag)
229 fprintf(stderr, "Read %d bytes for rec1.\n", n);
231 id = NSIG_I2(prod_file->rec1.struct_head.id);
232 if (radar_verbose_flag)
233 fprintf(stderr, "ID = %d\n", (int)id);
234 if (id != 7 && id != 27) { /* testing: Use 27 for Version 2 data */
235 fprintf(stderr, "File is not a SIGMET version 1 nor version 2 raw product file.\n");
239 n = nsig_read_record(fp, (char *)&prod_file->rec2);
240 if (radar_verbose_flag)
241 fprintf(stderr, "Read %d bytes for rec2.\n", n);
243 /* Count the bits set in 'data_mask' to determine the number
244 * of parameters present.
246 xh_size = NSIG_I2(prod_file->rec2.ingest_head.size_ext_ray_headers);
247 nrays = NSIG_I2(prod_file->rec2.ingest_head.num_rays);
248 if (radar_verbose_flag)
249 fprintf(stderr, "Expecting %d rays in each sweep.\n", nrays);
251 memmove(&masks[0], prod_file->rec2.task_config.dsp_info.data_mask_cur.mask_word_0,
253 memmove(&masks[1], &prod_file->rec2.task_config.dsp_info.data_mask_cur.mask_word_1,
256 for (j=0; j < 5; j++) {
257 data_mask = masks[j];
259 nparams += (data_mask >> i) & 0x1;
262 memmove(&data_mask, prod_file->rec2.task_config.dsp_info.data_mask, sizeof(fourb));
263 for (nparams=i=0; i<32; i++)
264 nparams += (data_mask >> i) & 0x1;
267 /* Number of sweeps */
268 nsweeps = NSIG_I2(prod_file->rec2.task_config.scan_info.num_swp);
272 memmove(site_name, prod_file->rec1.prod_end.site_name, sizeof(prod_file->rec1.prod_end.site_name));
273 site_name[sizeof(site_name)-1] = '\0';
274 if (radar_verbose_flag) {
275 fprintf(stderr, "nparams = %d, nsweeps = %d\n", nparams, nsweeps);
276 fprintf(stderr, "Site name = <%s>\n", site_name);
279 /* nsig_sweep = nsig_read_sweep(fp, prod_file)
281 * Use: nsig_sweep[i]->ray[j]->range
283 * where 'range' is [0..nbins-1]
287 * All the information you need is in:
289 * .struct_head, .prod_config .prod_end
291 * .struct_head, .ingest_head, .task_config .device_stat,
293 * nsig_sweep[0..nparams-1] 'nparams' is the true number
294 * of parameters present. You
295 * must check the 'id' (or type)
296 * to determine the field type.
297 * So far seen, nparams <= 6.
298 * nsig_sweep[i]->bhdr <NSIG_Raw_prod_bhdr>
299 * nsig_sweep[i]->idh <NSIG_Ingest_data_header>
300 * nsig_sweep[i]->ray[j] <NSIG_Ray *>
303 * For extended header access, you'll typically use nsig_sweep[0]
304 * (double check the id) and the ray data allocated (nsig_ray->range)
305 * is a pointer to the extended header, either v0 or v1.
306 * You can typecast the pointer to NSIG_Ext_header_ver0 or
307 * NSIG_Ext_header_ver1, as you like. To determine which
308 * version of the extended headers you have use:
309 * xh_size <= 20 for version 0, else version 1.
311 * xh_size = NSIG_I2(prod_file->rec2.ingest_head.size_ext_ray_headers)
314 * NSIG_I2(nsig_sweep[i]->idh.num_rays_act); -- # of rays. (j)
315 * NSIG_I2(nsig_sweep[i]->ray[j]->h.num_bins); -- # of bins in a ray.
317 * NSIG_I2(x), NSIG_I4(x) - Convert data, x, to floating point.
319 * IMPORTANT NOTE: It must be known whether or not to perform
320 * byte-swapping. To determine this, call
321 * 'nsig_endianess'. It returns 0 for no-swapping
322 * and 1 for swapping. Additionally, it transparently
323 * initializes the nsig library to automatically
324 * swap when using NSIG_I2 or NSIG_I4.
325 * The function 'nsig_read_sweep' automatically
326 * calls 'nsig_endianess', too.
329 sea_lvl_hgt = NSIG_I2(prod_file->rec1.prod_end.grnd_sea_ht);
331 if (radar_verbose_flag)
332 fprintf(stderr, "sea: %d\n", sea_lvl_hgt);
333 if (radar_verbose_flag)
334 fprintf(stderr, "site_name: %s", site_name);
336 /** Determine beamwidth from input variables (not saved in nsig file) **/
337 if(strncmp(site_name,"mit",3) == 0 || strncmp(site_name,"MIT",3) == 0)
338 beam_width = MIT_BEAMWIDTH;
339 else if(strncmp(site_name,"tog",3) == 0 || strncmp(site_name,"TOG",3) == 0)
340 beam_width = TOG_BEAMWIDTH;
341 else if(strncmp(site_name,"kwa",3) == 0 || strncmp(site_name,"KWA",3) == 0)
342 beam_width = KWA_BEAMWIDTH;
344 beam_width = DEFAULT_BEAMWIDTH;
346 if (radar_verbose_flag)
347 fprintf(stderr, "beamwidth: %f\n", beam_width);
349 vert_half_bw = beam_width/2.0;
350 horz_half_bw = beam_width/2.0;
352 /** Reading date and time **/
353 month = NSIG_I2(prod_file->rec2.ingest_head.start_time.month);
354 year = NSIG_I2(prod_file->rec2.ingest_head.start_time.year);
355 day = NSIG_I2(prod_file->rec2.ingest_head.start_time.day);
356 sec = NSIG_I4(prod_file->rec2.ingest_head.start_time.sec);
358 /* converting seconds since mid to time of day */
361 tmp = (tmp - hour) * 60.0;
363 second = (tmp - minute) * 60.0;
365 /** records of the nsig file. **/
367 pw = (NSIG_I4(prod_file->rec1.prod_end.pulse_wd))/100.0; /* pulse width */
368 prf = NSIG_I4(prod_file->rec1.prod_end.prf); /* pulse repetition frequency */
369 prf_mode = NSIG_I2(prod_file->rec2.task_config.dsp_info.prf_mode);
370 prf2 = prf * prf_modes[prf_mode];
371 wave = (NSIG_I4(prod_file->rec1.prod_end.wavelen))/100.0; /* wavelength (cm) */
372 rsl_kdp_wavelen = wave; /* EXTERNAL (volume.c) This sets KD_F and KD_INVF
373 * to operate with the proper wavelength.
375 numbins = NSIG_I4(prod_file->rec1.prod_end.num_bin); /* # bins in ray */
376 rng_first_bin = (float)NSIG_I4(prod_file->rec1.prod_end.rng_f_bin)/100.0;
377 rng_last_bin = (float)NSIG_I4(prod_file->rec1.prod_end.rng_l_bin)/100.0;
378 bin_space = ((rng_last_bin-rng_first_bin)/numbins); /*rng res (m)*/
380 numsweep = NSIG_I2(prod_file->rec2.task_config.scan_info.num_swp); /* # sweeps in volume */
381 num_samples = NSIG_I2(prod_file->rec1.prod_end.num_samp);
382 sweep_rate = 3.0; /** Approximate value -- info not stored **/
383 azim_rate = sweep_rate*360.0/60.0;
386 float max_vel1 = wave*prf/(100.0*4.0);
387 float max_vel2 = wave*prf2/(100.0*4.0);
389 max_vel = (max_vel1 * max_vel2)/(max_vel1-max_vel2);
393 max_vel = wave*prf/(100.0*4.0);
396 freq = (299793000.0/wave)*1.0e-4; /** freq in MHZ **/
398 sqi = NSIG_I2(prod_file->rec2.task_config.calib_info.sqi)/256.0;
399 log = NSIG_I2(prod_file->rec2.task_config.calib_info.noise)/16.0;
400 csr = NSIG_I2(prod_file->rec2.task_config.calib_info.clutr_corr)/(-16.0);
401 sig = NSIG_I2(prod_file->rec2.task_config.calib_info.power)/16.0;
402 cal_dbz = NSIG_I2(prod_file->rec2.task_config.calib_info.cal_ref)/16.0;
403 z_flag_unc = NSIG_I2(prod_file->rec2.task_config.calib_info.z_flag_unc);
404 z_flag_cor = NSIG_I2(prod_file->rec2.task_config.calib_info.z_flag_cor);
405 v_flag = NSIG_I2(prod_file->rec2.task_config.calib_info.v_flag);
406 w_flag = NSIG_I2(prod_file->rec2.task_config.calib_info.w_flag);
407 speckle = NSIG_I2(prod_file->rec2.task_config.calib_info.speckle);
409 /** Verbose calibration information **/
410 if (radar_verbose_flag)
412 fprintf(stderr, "LOG = %5.2f\n", log);
413 fprintf(stderr, "SQI = %5.2f\n", sqi);
414 fprintf(stderr, "CSR = %5.2f\n", csr);
415 fprintf(stderr, "SIG = %5.2f\n", sig);
416 fprintf(stderr, "Calibration reflectivity: %5.2f dBZ\n", cal_dbz);
417 fprintf(stderr, "ZT flags: %d\n", z_flag_unc); /** can find these **/
418 fprintf(stderr, "DZ flags: %d\n", z_flag_cor); /** defn in the **/
419 fprintf(stderr, "VR flags: %d\n", v_flag); /** SIGMET Doc **/
420 fprintf(stderr, "SW flags: %d\n", w_flag);
421 fprintf(stderr, "Flags: -3856 = SQI thresholding\n");
422 fprintf(stderr, " -21846 = LOG thresholding\n");
423 fprintf(stderr, " -24416 = LOG & SQI thresholding\n");
424 fprintf(stderr, " -24516 = LOG & SQI & SIG thresholding\n");
425 fprintf(stderr, "speckle remover: %d\n", speckle);
428 if (radar_verbose_flag)
429 fprintf(stderr, "vel: %f prf: %f prf2: %f\n", max_vel, prf, prf2);
431 /** Extracting Latitude and Longitude from nsig file **/
432 lat = nsig_from_fourb_ang(prod_file->rec2.ingest_head.lat_rad);
433 lon = nsig_from_fourb_ang(prod_file->rec2.ingest_head.lon_rad);
434 if(lat > 180.0) lat -= 360.0;
435 if(lon > 180.0) lon -= 360.0;
436 if (radar_verbose_flag)
437 fprintf(stderr, "nsig_to_radar: lat %f, lon %f\n", lat, lon);
438 /** Latitude deg, min, sec **/
440 tmp = (lat - latd) * 60.0;
442 lats = (int)((tmp - latm) * 60.0);
443 /** Longitude deg, min, sec **/
445 tmp = (lon - lond) * 60.0;
447 lons = (int)((tmp - lonm) * 60.0);
449 /** Allocating memory for radar structure **/
450 radar = RSL_new_radar(MAX_RADAR_VOLUMES);
453 fprintf(stderr, "nsig_to_radar: radar is NULL\n");
457 /** Filling Radar Header **/
458 radar->h.month = month;
460 radar->h.year = year; /* Year 2000 compliant. */
461 radar->h.hour = hour;
462 radar->h.minute = minute;
463 radar->h.sec = second;
464 sprintf(radar->h.radar_type, "%s", radar_type);
465 radar->h.number = radar_number;
466 memmove(radar->h.name, site_name, sizeof(radar->h.name));
467 memmove(radar->h.radar_name, site_name, sizeof(radar->h.radar_name));
468 memmove(radar->h.city, city, sizeof(radar->h.city));
469 memmove(radar->h.state, state, sizeof(radar->h.state));
470 radar->h.latd = latd;
471 radar->h.latm = latm;
472 radar->h.lats = lats;
473 radar->h.lond = lond;
474 radar->h.lonm = lonm;
475 radar->h.lons = lons;
476 radar->h.height = (int)sea_lvl_hgt;
477 radar->h.spulse = (int)(pw*1000);
478 radar->h.lpulse = (int)(pw*1000);
480 if (radar_verbose_flag) {
482 fprintf(stderr, "\nSIGMET version 2 raw product file.\n");
484 fprintf(stderr, "\nSIGMET version 1 raw product file.\n");
486 fprintf(stderr, "Date: %2.2d/%2.2d/%4.4d %2.2d:%2.2d:%f\n",
487 radar->h.month, radar->h.day, radar->h.year,
488 radar->h.hour, radar->h.minute, radar->h.sec);
489 fprintf(stderr, "Name: ");
490 for (i=0; i<sizeof(radar->h.name); i++)
491 fprintf(stderr, "%c", radar->h.name[i]);
492 fprintf(stderr, "\n");
493 fprintf(stderr, "Lat/lon (%d %d' %d'', %d %d' %d'')\n",
494 radar->h.latd, radar->h.latm, radar->h.lats,
495 radar->h.lond, radar->h.lonm, radar->h.lons);
498 /** Converting data **/
499 if (radar_verbose_flag) fprintf(stderr, "Expecting %d sweeps.\n", numsweep);
500 for(i = 0; i < numsweep; i++)
502 nsig_sweep = nsig_read_sweep(fp, prod_file);
503 if (nsig_sweep == NULL) { /* EOF possibility */
507 if (rsl_qsweep != NULL) {
508 if (i > rsl_qsweep_max) break;
509 if (rsl_qsweep[i] == 0) continue;
511 if (radar_verbose_flag)
512 fprintf(stderr, "Read sweep # %d\n", i);
513 /* The whole sweep is 'nsig_sweep' ... pretty slick.
515 * nsig_sweep[itype] -- [0..nparams], if non-null.
517 for (itype=0; itype<nparams; itype++) {
518 if (nsig_sweep[itype] == NULL) continue;
520 /** Reading date and time **/
521 sweep_month = NSIG_I2(nsig_sweep[itype]->idh.time.month);
522 sweep_year = NSIG_I2(nsig_sweep[itype]->idh.time.year);
523 sweep_day = NSIG_I2(nsig_sweep[itype]->idh.time.day);
524 sweep_sec = NSIG_I4(nsig_sweep[itype]->idh.time.sec);
526 msec = NSIG_I2(nsig_sweep[itype]->idh.time.msec);
527 /* printf("....... msec == %d\n", msec); */
529 /* converting seconds since mid to time of day */
530 tmp = sweep_sec/3600.0;
531 sweep_hour = (int)tmp;
532 tmp = (tmp - sweep_hour) * 60.0;
533 sweep_minute = (int)tmp;
534 sweep_second = sweep_sec - (sweep_hour*3600 + sweep_minute*60);
536 num_rays = NSIG_I2(nsig_sweep[itype]->idh.num_rays_exp);
538 data_type = NSIG_I2(nsig_sweep[itype]->idh.data_type);
580 case NSIG_DTB_PHIDP: /* SRB 990127 */
585 case NSIG_DTB_RHOHV: /* SRB 000414 */
601 case NSIG_DTB_PHIDP2:
606 case NSIG_DTB_RHOHV2:
617 case NSIG_DTB_HCLASS:
618 case NSIG_DTB_HCLASS2:
632 fprintf(stderr,"Unknown field type: %d Skipping it.\n", data_type);
636 if (radar_verbose_flag)
637 fprintf(stderr, " nsig_sweep[%d], data_type = %d, rays(expected) = %d, nrays(actual) = %d\n", itype, data_type, num_rays, NSIG_I2(nsig_sweep[itype]->idh.num_rays_act));
639 if (data_type != NSIG_DTB_EXH) {
640 if ((radar->v[ifield] == NULL)) {
641 if (rsl_qfield[ifield]) {
642 radar->v[ifield] = RSL_new_volume(numsweep);
643 radar->v[ifield]->h.f = f;
644 radar->v[ifield]->h.invf = invf;
646 /* Skip this field, because, the user does not want it. */
650 if (radar->v[ifield]->sweep[i] == NULL)
651 radar->v[ifield]->sweep[i] = RSL_new_sweep(num_rays);
654 continue; /* Skip the actual extended header processing.
655 * This is different than getting it, so that
656 * the information is available for the other
657 * fields when filling the RSL ray headers.
660 /** DATA conversion time **/
661 sweep = radar->v[ifield]->sweep[i];
663 sweep->h.invf = invf;
664 sweep->h.sweep_num = i;
665 sweep->h.beam_width = beam_width;
666 sweep->h.vert_half_bw = vert_half_bw;
667 sweep->h.horz_half_bw = horz_half_bw;
668 elev = nsig_from_bang(nsig_sweep[itype]->idh.fix_ang);
669 sweep->h.elev = elev;
671 for(j = 0; j < num_rays; j++)
673 ray_p = nsig_sweep[itype]->ray[j];
674 if (ray_p == NULL) continue;
675 bin_num = NSIG_I2(ray_p->h.num_bins);
677 /* Load extended header information, if available.
678 * We need to pass the entire nsig_sweep and search for
679 * the extended header field (it may not be data_type==0).
681 get_extended_header_info(nsig_sweep, xh_size, j, nparams,
683 &pitch, &roll, &heading,
684 &azm_rate, &elev_rate,
685 &pitch_rate, &roll_rate, &heading_rate,
686 &lat, &lon, &alt, &rvc,
687 &vel_east, &vel_north, &vel_up);
690 if (radar->v[ifield]->sweep[i]->ray[j] == NULL)
691 radar->v[ifield]->sweep[i]->ray[j] = RSL_new_ray(bin_num);
692 ray = radar->v[ifield]->sweep[i]->ray[j];
695 /** Ray is at nsig_sweep[itype].ray->... **/
696 /** Loading nsig data into data structure **/
698 ray->h.month = sweep_month;
699 ray->h.day = sweep_day;
700 ray->h.year = sweep_year; /* Year 2000 compliant. */
701 ray->h.hour = sweep_hour;
702 ray->h.minute = sweep_minute;
703 if (msec == 0) { /* No extended header */
704 ray->h.sec = NSIG_I2(ray_p->h.sec) + sweep_second;
705 elev = sweep->h.elev;
707 ray->h.sec = sweep_second + msec/1000.0;
709 /* add time ... handles end of min,hour,month,year and century. */
710 if (ray->h.sec >= 60) /* Should I fix the time no matter what? */
711 RSL_fix_time(ray); /* Repair second overflow. */
715 ray->h.range_bin1 = (int)rng_first_bin;
716 ray->h.gate_size = (int)(bin_space+.5); /* Nearest int */
717 ray->h.vel_res = bin_space;
718 ray->h.sweep_rate = sweep_rate;
719 ray->h.prf = (int)prf;
721 ray->h.unam_rng = 299793000.0 / (2.0 * prf * 1000.0); /* km */
723 ray->h.unam_rng = 0.0;
724 ray->h.prf2 = (int) prf2;
725 ray->h.fix_angle = (float)sweep->h.elev;
726 ray->h.azim_rate = azim_rate;
727 ray->h.pulse_count = num_samples;
728 ray->h.pulse_width = pw;
729 ray->h.beam_width = beam_width;
730 ray->h.frequency = freq / 1000.0; /* GHz */
731 ray->h.wavelength = wave/100.0; /* meters */
732 ray->h.nyq_vel = max_vel; /* m/s */
733 if (elev == 0.) elev = sweep->h.elev;
734 ray->h.elev = (nsig_from_bang(ray_p->h.end_elev)+nsig_from_bang(ray_p->h.beg_elev))/2.0;
735 /* Compute mean azimuth angle for ray. */
736 az1 = nsig_from_bang(ray_p->h.beg_azm);
737 az2 = nsig_from_bang(ray_p->h.end_azm);
738 /* printf("az1, %f, az2 %f\n", az1, az2); */
740 if((az1 - az2) > 180.0) az2 += 360.0;
744 if((az2 - az1) > 180.0) az1 += 360.0;
746 az1 = (az1 + az2) / 2.0;
747 if (az1 > 360) az1 -= 360;
748 ray->h.azimuth = az1;
750 /* From the extended header information, we learn the following. */
751 ray->h.pitch = pitch;
753 ray->h.heading = heading;
754 ray->h.pitch_rate = pitch_rate;
755 ray->h.roll_rate = roll_rate;
756 ray->h.heading_rate = heading_rate;
761 ray->h.vel_east = vel_east;
762 ray->h.vel_north = vel_north;
763 ray->h.vel_up = vel_up;
765 /* printf("Processing sweep[%d]->ray[%d]: %d %f %f %f %f %f %f %f %f %d nbins=%d, bin1=%d gate=%d\n",
766 i, j, msec, ray->h.sec, ray->h.azimuth, ray->h.elev, ray->h.pitch, ray->h.roll, ray->h.heading, ray->h.lat, ray->h.lon, ray->h.alt, ray->h.nbins, ray->h.range_bin1, ray->h.gate_size);
768 /* TODO: ingest data header contains a value for bits-per-bin.
769 * This might be of use to allocate an array for ray->range with
770 * either 1-byte or 2-byte elements. Then there's no need for
771 * memmove() whenever we need 2 bytes.
774 if (data_type == NSIG_DTB_EXH) continue;
776 for(k = 0; k < bin_num; k++) {
780 if (ray_p->range[k] == 0) ray_data = NSIG_NO_ECHO;
781 else ray_data = (float)((ray_p->range[k]-64.0)/2.0);
783 /* Simplified the velocity conversion for NSIG_DTB_VEL, using
784 * formula from IRIS Programmer's Manual. BLK, Oct 9 2009.
787 if (ray_p->range[k] == 0) ray_data = NSIG_NO_ECHO;
788 else ray_data = (float)((ray_p->range[k]-128.0)/127.0)*max_vel;
792 if (ray_p->range[k] == 0) ray_data = NSIG_NO_ECHO;
793 else ray_data =(float)((ray_p->range[k])/256.0)*max_vel;
797 if (ray_p->range[k] == 0) ray_data = NSIG_NO_ECHO;
798 else ray_data = (float)((ray_p->range[k]-128.0)/16.0);
802 if (ray_p->range[k] == 0 || ray_p->range[k] == 255 ||
803 rsl_kdp_wavelen == 0.0) {
804 ray_data = NSIG_NO_ECHO;
807 if (ray_p->range[k] < 128)
809 pow((double)600.0,(double)((127-ray_p->range[k])/126.0))) /
811 else if (ray_p->range[k] > 128)
813 pow((double)600.0,(double)((ray_p->range[k]-129)/126.0))) /
820 if (ray_p->range[k] == 0 || ray_p->range[k] == 255)
821 ray_data = NSIG_NO_ECHO;
823 ray_data = 180.0*((ray_p->range[k]-1.0)/254.0);
827 if (ray_p->range[k] == 0 || ray_p->range[k] == 255)
828 ray_data = NSIG_NO_ECHO;
830 ray_data = sqrt((double)((ray_p->range[k]-1.0)/253.0));
833 case NSIG_DTB_HCLASS:
834 if (ray_p->range[k] == 0 || ray_p->range[k] == 255)
835 ray_data = NSIG_NO_ECHO;
837 ray_data = ray_p->range[k];
841 if (ray_p->range[k] == 0) ray_data = NSIG_NO_ECHO;
842 else ray_data = (float)sqrt((ray_p->range[k]-1.0)/253.0);
846 if (ray_p->range[k] == 0) ray_data = NSIG_NO_ECHO;
848 incr=75./127.; /* (+|- 75m/s) / 254 values */
849 ray_data = (float)(ray_p->range[k]-128)*incr;
859 memmove(nsig_twob, &ray_p->range[2*k], 2);
860 nsig_2byte = NSIG_I2(nsig_twob);
861 if (nsig_2byte == 0 || nsig_2byte == 65535)
862 ray_data = NSIG_NO_ECHO2;
863 else ray_data = (float)(nsig_2byte-32768)/100.;
867 memmove(nsig_twob, &ray_p->range[2*k], 2);
868 nsig_2byte = NSIG_I2(nsig_twob);
869 if (nsig_2byte == 0 || nsig_2byte == 65535)
870 ray_data = NSIG_NO_ECHO2;
871 else ray_data = (float)nsig_2byte/100.;
874 case NSIG_DTB_PHIDP2:
875 memmove(nsig_twob, &ray_p->range[2*k], 2);
876 nsig_2byte = NSIG_I2(nsig_twob);
877 if (nsig_2byte == 0 || nsig_2byte == 65535)
878 ray_data = NSIG_NO_ECHO;
880 ray_data = 360.*(nsig_2byte-1)/65534.;
884 case NSIG_DTB_RHOHV2:
885 memmove(nsig_twob, &ray_p->range[2*k], 2);
886 nsig_2byte = NSIG_I2(nsig_twob);
887 if (nsig_2byte == 0 || nsig_2byte == 65535)
888 ray_data = NSIG_NO_ECHO2;
889 else ray_data = (float)(nsig_2byte-1)/65533.;
892 case NSIG_DTB_HCLASS2:
893 memmove(nsig_twob, &ray_p->range[2*k], 2);
894 nsig_2byte = NSIG_I2(nsig_twob);
895 if (nsig_2byte == 0 || nsig_2byte == 65535)
896 ray_data = NSIG_NO_ECHO2;
898 ray_data = nsig_2byte;
901 if (ray_data == NSIG_NO_ECHO || ray_data == NSIG_NO_ECHO2)
902 ray->range[k] = ray->h.invf(BADVAL);
904 ray->range[k] = ray->h.invf(ray_data);
907 if (data_type == NSIG_DTB_KDP)
908 printf("v[%d]->sweep[%d]->ray[%d]->range[%d] = %f, %d, %f\n",
909 ifield, i, j, k, ray->h.f(ray->range[k]),
910 (int)ray_p->range[k], ray_data);
915 nsig_free_sweep(nsig_sweep);
918 /* Do not reset radar->h.nvolumes. It is already set properly. */
919 if (radar_verbose_flag)
920 fprintf(stderr, "Max index of radar->v[0..%d]\n", radar->h.nvolumes);
923 /** close nsig file **/
926 radar = RSL_prune_radar(radar);
927 /** return radar pointer **/