| 1 |
/* |
| 2 |
* hmib2ptr.c |
| 3 |
* |
| 4 |
* This module takes hmi.B_720s and convert into three field components (Bp, Bt, Br) |
| 5 |
* and optionally Stony Hurst longitude, latitude |
| 6 |
* and three error images (Bp_err, Bt_err, Br_err) |
| 7 |
* Potentially to be used in export system |
| 8 |
* |
| 9 |
* Author: |
| 10 |
* Xudong Sun |
| 11 |
* |
| 12 |
* Version: |
| 13 |
* v0.0 Aug 28 2015 |
| 14 |
* |
| 15 |
* Notes: |
| 16 |
* v0.0 |
| 17 |
* Need to check externally that the input is hmi.B_720s |
| 18 |
* |
| 19 |
* Example Calls: |
| 20 |
* hmib2ptr "in=hmi.B_720s[2011.02.15_00:00]" "out=hmi_test.Bptr_720s" "requestid=test" -e -l |
| 21 |
* |
| 22 |
*/ |
| 23 |
|
| 24 |
#include <stdio.h> |
| 25 |
#include <stdlib.h> |
| 26 |
#include <time.h> |
| 27 |
#include <sys/time.h> |
| 28 |
#include <math.h> |
| 29 |
#include <string.h> |
| 30 |
#include "jsoc_main.h" |
| 31 |
#include "astro.h" |
| 32 |
#include "fstats.h" |
| 33 |
//#include "cartography.c" |
| 34 |
//#include "img2helioVector.c" |
| 35 |
//#include "vecErrProp.c" // new version of errorprop |
| 36 |
|
| 37 |
#define PI (M_PI) |
| 38 |
#define TWOPI (2*M_PI) |
| 39 |
#define RADSINDEG (PI/180.) |
| 40 |
#define RAD2ARCSEC (648000./M_PI) |
| 41 |
#define SECINDAY (86400.) |
| 42 |
#define FOURK (4096) |
| 43 |
#define FOURK2 (16777216) |
| 44 |
|
| 45 |
#define ARRLENGTH(ARR) (sizeof(ARR) / sizeof(ARR[0])) |
| 46 |
|
| 47 |
// Some other things |
| 48 |
#ifndef MIN |
| 49 |
#define MIN(a,b) (((a)<(b)) ? (a) : (b)) |
| 50 |
#endif |
| 51 |
#ifndef MAX |
| 52 |
#define MAX(a,b) (((a)>(b)) ? (a) : (b)) |
| 53 |
#endif |
| 54 |
|
| 55 |
#define DIE(msg) {fflush(stdout); fprintf(stderr,"%s, status=%d\n", msg, status); return(status);} |
| 56 |
#define SHOW(msg) {printf("%s", msg); fflush(stdout);} |
| 57 |
|
| 58 |
#define FREE_ARR(arr) {if (arr) {free(arr);}} |
| 59 |
#define DRMS_FREE_ARR(arr) {if (arr && (arr->data)) {drms_free_array(arr);}} |
| 60 |
|
| 61 |
#define kNotSpecified "Not Specified" |
| 62 |
|
| 63 |
// Macros for WCS transformations. assume crpix1, crpix2 = CRPIX1, CRPIX2, sina,cosa = sin and cos of CROTA2 resp. |
| 64 |
// and crvalx and crvaly are CRVAL1 and CRVAL2, cdelt = CDELT1 == CDELT2, then |
| 65 |
// PIX_X and PIX_Y are CCD pixel addresses, WX and WY are arc-sec W and N on the Sun from disk center. |
| 66 |
#define PIX_X(wx,wy) ((((wx-crvalx)*cosa + (wy-crvaly)*sina)/cdelt)+crpix1) |
| 67 |
#define PIX_Y(wx,wy) ((((wy-crvaly)*cosa - (wx-crvalx)*sina)/cdelt)+crpix2) |
| 68 |
#define WX(pix_x,pix_y) (((pix_x-crpix1)*cosa - (pix_y-crpix2)*sina)*cdelt+crvalx) |
| 69 |
#define WY(pix_x,pix_y) (((pix_y-crpix2)*cosa + (pix_x-crpix1)*sina)*cdelt+crvaly) |
| 70 |
|
| 71 |
// Ephemeris information |
| 72 |
struct ephemeris { |
| 73 |
double disk_lonc, disk_latc; |
| 74 |
double disk_xc, disk_yc; |
| 75 |
double rSun, asd, pa; |
| 76 |
}; |
| 77 |
|
| 78 |
//================================================================================================= |
| 79 |
|
| 80 |
/* Get ephemeris information */ |
| 81 |
int getEphemeris(DRMS_Record_t *inRec, struct ephemeris *ephem); |
| 82 |
|
| 83 |
/* Convert field vector, calls img2helioVector */ |
| 84 |
void get_bptr(struct ephemeris *ephem, int *dims, float *fld, float *inc, float *azi, |
| 85 |
float *bp, float *bt, float *br, float *lon, float *lat); |
| 86 |
|
| 87 |
/* Compute error, calls errprop_rad */ |
| 88 |
void get_bptr_err(struct ephemeris *ephem, int *dims, float *fld, float *inc, float *azi, |
| 89 |
float *lon, float *lat, |
| 90 |
float *err_fld, float *err_inc, float *err_azi, float *cc_fi, float *cc_fa, float *cc_ia, |
| 91 |
float *err_bp, float *err_bt, float *err_br); |
| 92 |
|
| 93 |
/* Vector transformation */ |
| 94 |
int img2helioVector (double bxImg, double byImg, double bzImg, double *bxHelio, |
| 95 |
double *byHelio, double *bzHelio, double lon, double lat, |
| 96 |
double lonc, double latc, double pAng); |
| 97 |
|
| 98 |
/* Error propagation */ |
| 99 |
void vecErrProp(float fld, float inc, float azi, |
| 100 |
float var_fld, float var_inc, float var_azi, float cov_fi, float cov_fa, float cov_ia, |
| 101 |
double lon, double lat, double lonc, double latc, double pa, |
| 102 |
double *var_bp, double *var_bt, double *var_br); |
| 103 |
|
| 104 |
/* From Cartography.c */ |
| 105 |
int img2sphere (double x, double y, double ang_r, double latc, double lonc, |
| 106 |
double pa, double *rho, double *lat, double *lon, double *sinlat, |
| 107 |
double *coslat, double *sig, double *mu, double *chi); |
| 108 |
|
| 109 |
//================================================================================================= |
| 110 |
|
| 111 |
char *module_name = "sharp"; |
| 112 |
|
| 113 |
ModuleArgs_t module_args[] = |
| 114 |
{ |
| 115 |
{ARG_STRING, "in", kNotSpecified, "Input B series."}, |
| 116 |
{ARG_STRING, "out", kNotSpecified, "Input Bptr series."}, |
| 117 |
{ARG_STRING, "requestid", kNotSpecified, "Request ID."}, |
| 118 |
{ARG_INT, "ambweak", "2", "Disambiguation method. 0: potential acute, 1: random, 2: radial acute"}, |
| 119 |
{ARG_FLAG, "l", "0", "Flag for lat/lon output."}, |
| 120 |
{ARG_FLAG, "e", "0", "Flag for error output."}, |
| 121 |
{ARG_END} |
| 122 |
}; |
| 123 |
|
| 124 |
int DoIt(void) |
| 125 |
{ |
| 126 |
|
| 127 |
int status = DRMS_SUCCESS; |
| 128 |
|
| 129 |
/* Get parameters */ |
| 130 |
|
| 131 |
char *inQuery = (char *) params_get_str(&cmdparams, "in"); |
| 132 |
char *outQuery = (char *) params_get_str(&cmdparams, "out"); |
| 133 |
char *requestid = (char *) params_get_str(&cmdparams, "requestid"); |
| 134 |
int ambweak = params_get_int(&cmdparams, "ambweak"); |
| 135 |
int do_lonlat = params_isflagset(&cmdparams, "l"); |
| 136 |
int do_error = params_isflagset(&cmdparams, "e"); |
| 137 |
|
| 138 |
if (ambweak < 0 || ambweak > 2) ambweak = 2; |
| 139 |
|
| 140 |
/* Input and output data */ |
| 141 |
|
| 142 |
DRMS_RecordSet_t *inRS = drms_open_records(drms_env, inQuery, &status); |
| 143 |
|
| 144 |
if (!inRS) |
| 145 |
{ |
| 146 |
DIE("No records specified by record-set specification.\n"); |
| 147 |
} |
| 148 |
|
| 149 |
int nrecs = inRS->n; |
| 150 |
if (status || nrecs == 0) DIE("Input records error."); |
| 151 |
|
| 152 |
DRMS_RecordSet_t *outRS = drms_create_records(drms_env, nrecs, outQuery, DRMS_PERMANENT, &status); |
| 153 |
if (status) { |
| 154 |
drms_close_records(inRS, DRMS_FREE_RECORD); |
| 155 |
DIE("Output records not created."); |
| 156 |
} |
| 157 |
|
| 158 |
/* Work */ |
| 159 |
|
| 160 |
printf("Processing %d records:\n", nrecs); |
| 161 |
|
| 162 |
for (int irec = 0; irec < nrecs; irec++) { |
| 163 |
|
| 164 |
// Input record |
| 165 |
DRMS_Record_t *inRec = inRS->records[irec]; |
| 166 |
|
| 167 |
if (!inRec) |
| 168 |
{ |
| 169 |
fprintf(stderr, "No record with index %d in record set.\n", irec); |
| 170 |
continue; |
| 171 |
} |
| 172 |
|
| 173 |
TIME t_rec = drms_getkey_time(inRec, "T_REC", &status); |
| 174 |
|
| 175 |
if (status != DRMS_SUCCESS) |
| 176 |
{ |
| 177 |
fprintf(stderr, "Unable to obtain keyword value for T_REC.\n"); |
| 178 |
continue; |
| 179 |
} |
| 180 |
|
| 181 |
char t_rec_str[100]; |
| 182 |
sprint_time(t_rec_str, t_rec, "TAI", 0); |
| 183 |
printf("Processing record #%d, T_REC=%s\n", irec, t_rec_str); |
| 184 |
|
| 185 |
// Ephemeris |
| 186 |
|
| 187 |
struct ephemeris ephem; |
| 188 |
status = getEphemeris(inRec, &ephem); // can never return anything but 'success'. |
| 189 |
|
| 190 |
// Input images |
| 191 |
|
| 192 |
DRMS_Segment_t *inSeg_fld = drms_segment_lookup(inRec, "field"); |
| 193 |
if (!inSeg_fld) |
| 194 |
{ |
| 195 |
fprintf(stderr, "Missing required segment 'field'.\n"); |
| 196 |
continue; |
| 197 |
} |
| 198 |
|
| 199 |
DRMS_Segment_t *inSeg_inc = drms_segment_lookup(inRec, "inclination"); |
| 200 |
if (!inSeg_inc) |
| 201 |
{ |
| 202 |
fprintf(stderr, "Missing required segment 'inclination'.\n"); |
| 203 |
continue; |
| 204 |
} |
| 205 |
|
| 206 |
DRMS_Segment_t *inSeg_azi = drms_segment_lookup(inRec, "azimuth"); |
| 207 |
if (!inSeg_azi) |
| 208 |
{ |
| 209 |
fprintf(stderr, "Missing required segment 'azimuth'.\n"); |
| 210 |
continue; |
| 211 |
} |
| 212 |
|
| 213 |
DRMS_Segment_t *inSeg_amb = drms_segment_lookup(inRec, "disambig"); |
| 214 |
if (!inSeg_amb) |
| 215 |
{ |
| 216 |
fprintf(stderr, "Missing required segment 'disambig'.\n"); |
| 217 |
continue; |
| 218 |
} |
| 219 |
|
| 220 |
int status_fld = 0, status_inc = 0, status_azi = 0, status_amb = 0; |
| 221 |
DRMS_Array_t *inArray_fld = NULL, *inArray_inc = NULL, *inArray_azi = NULL, *inArray_amb = NULL; |
| 222 |
inArray_fld = drms_segment_read(inSeg_fld, DRMS_TYPE_FLOAT, &status_fld); |
| 223 |
inArray_inc = drms_segment_read(inSeg_inc, DRMS_TYPE_FLOAT, &status_inc); |
| 224 |
inArray_azi = drms_segment_read(inSeg_azi, DRMS_TYPE_FLOAT, &status_azi); |
| 225 |
inArray_amb = drms_segment_read(inSeg_amb, DRMS_TYPE_CHAR, &status_amb); |
| 226 |
if (status_fld || status_inc || status_azi || status_amb) { |
| 227 |
printf("Reading input arrays error, record skipped\n"); |
| 228 |
DRMS_FREE_ARR(inArray_fld); DRMS_FREE_ARR(inArray_inc); |
| 229 |
DRMS_FREE_ARR(inArray_azi); DRMS_FREE_ARR(inArray_amb); |
| 230 |
continue; |
| 231 |
} |
| 232 |
|
| 233 |
// Input error images if needed |
| 234 |
|
| 235 |
DRMS_Array_t *inArray_err_fld = NULL, *inArray_err_inc = NULL, *inArray_err_azi = NULL; |
| 236 |
DRMS_Array_t *inArray_cc_fi = NULL, *inArray_cc_fa = NULL, *inArray_cc_ia = NULL; |
| 237 |
if (do_error) { |
| 238 |
DRMS_Segment_t *inSeg_err_fld = drms_segment_lookup(inRec, "field_err"); |
| 239 |
DRMS_Segment_t *inSeg_err_inc = drms_segment_lookup(inRec, "inclination_err"); |
| 240 |
DRMS_Segment_t *inSeg_err_azi = drms_segment_lookup(inRec, "azimuth_err"); |
| 241 |
DRMS_Segment_t *inSeg_cc_fi = drms_segment_lookup(inRec, "field_inclination_err"); |
| 242 |
DRMS_Segment_t *inSeg_cc_fa = drms_segment_lookup(inRec, "field_az_err"); |
| 243 |
DRMS_Segment_t *inSeg_cc_ia = drms_segment_lookup(inRec, "inclin_azimuth_err"); |
| 244 |
|
| 245 |
if (!inSeg_err_fld || !inSeg_err_inc || !inSeg_err_azi || !inSeg_cc_fi || !inSeg_cc_fa || !inSeg_cc_ia) |
| 246 |
{ |
| 247 |
fprintf(stderr, "Missing one or more required error segments.\n"); |
| 248 |
continue; |
| 249 |
} |
| 250 |
|
| 251 |
int status_err_fld = 0, status_err_inc = 0, status_err_azi = 0; |
| 252 |
int status_cc_fi = 0, status_cc_fa = 0, status_cc_ia = 0; |
| 253 |
|
| 254 |
inArray_err_fld = drms_segment_read(inSeg_err_fld, DRMS_TYPE_FLOAT, &status_err_fld); |
| 255 |
inArray_err_inc = drms_segment_read(inSeg_err_inc, DRMS_TYPE_FLOAT, &status_err_inc); |
| 256 |
inArray_err_azi = drms_segment_read(inSeg_err_azi, DRMS_TYPE_FLOAT, &status_err_azi); |
| 257 |
inArray_cc_fi = drms_segment_read(inSeg_cc_fi, DRMS_TYPE_FLOAT, &status_cc_fi); |
| 258 |
inArray_cc_fa = drms_segment_read(inSeg_cc_fa, DRMS_TYPE_FLOAT, &status_cc_fa); |
| 259 |
inArray_cc_ia = drms_segment_read(inSeg_cc_ia, DRMS_TYPE_FLOAT, &status_cc_ia); |
| 260 |
if (status_err_fld || status_err_inc || status_err_azi || |
| 261 |
status_cc_fi || status_cc_fa || status_cc_ia) { |
| 262 |
printf("Reading input uncertainty arrays error, record skipped\n"); |
| 263 |
DRMS_FREE_ARR(inArray_err_fld); DRMS_FREE_ARR(inArray_err_inc); DRMS_FREE_ARR(inArray_err_azi); |
| 264 |
DRMS_FREE_ARR(inArray_cc_fi); DRMS_FREE_ARR(inArray_cc_fa); DRMS_FREE_ARR(inArray_cc_ia); |
| 265 |
DRMS_FREE_ARR(inArray_fld); DRMS_FREE_ARR(inArray_inc); |
| 266 |
DRMS_FREE_ARR(inArray_azi); DRMS_FREE_ARR(inArray_amb); |
| 267 |
continue; |
| 268 |
} |
| 269 |
} |
| 270 |
|
| 271 |
// Some pre-processing |
| 272 |
|
| 273 |
int ncols = inArray_fld->axis[0], nrows = inArray_fld->axis[1]; // FOURK |
| 274 |
int npix = ncols * nrows; |
| 275 |
int dims[2] = {ncols, nrows}; |
| 276 |
|
| 277 |
float *fld = (float *) (inArray_fld->data); |
| 278 |
float *inc = (float *) (inArray_inc->data); |
| 279 |
float *azi = (float *) (inArray_azi->data); |
| 280 |
char *amb = (char *) (inArray_amb->data); |
| 281 |
for (int ipix = 0; ipix < npix; ipix++) { |
| 282 |
inc[ipix] *= RADSINDEG; |
| 283 |
if (amb[ipix] >> ambweak) azi[ipix] += 180.; // bitwise operator |
| 284 |
azi[ipix] *= RADSINDEG; |
| 285 |
} |
| 286 |
|
| 287 |
float *err_fld = NULL, *err_inc = NULL, *err_azi = NULL; |
| 288 |
float *cc_fi = NULL, *cc_fa = NULL, *cc_ia = NULL; |
| 289 |
if (do_error) { |
| 290 |
err_fld = (float *) (inArray_err_fld->data); |
| 291 |
err_inc = (float *) (inArray_err_inc->data); |
| 292 |
err_azi = (float *) (inArray_err_azi->data); |
| 293 |
cc_fi = (float *) (inArray_cc_fi->data); |
| 294 |
cc_fa = (float *) (inArray_cc_fa->data); |
| 295 |
cc_ia = (float *) (inArray_cc_ia->data); |
| 296 |
for (int ipix = 0; ipix < npix; ipix++) { |
| 297 |
err_inc[ipix] *= RADSINDEG; |
| 298 |
err_azi[ipix] *= RADSINDEG; // conver to radian |
| 299 |
} |
| 300 |
} |
| 301 |
|
| 302 |
// Bptr, also calculate lon/lat |
| 303 |
|
| 304 |
float *bp = (float *) (malloc(npix * sizeof(float))); |
| 305 |
float *bt = (float *) (malloc(npix * sizeof(float))); |
| 306 |
float *br = (float *) (malloc(npix * sizeof(float))); |
| 307 |
float *lon = (float *) (malloc(npix * sizeof(float))); // lon/lat in rad |
| 308 |
float *lat = (float *) (malloc(npix * sizeof(float))); |
| 309 |
get_bptr(&ephem, dims, fld, inc, azi, bp, bt, br, lon, lat); // working function |
| 310 |
|
| 311 |
// Error if requested |
| 312 |
|
| 313 |
float *err_bp = NULL, *err_bt = NULL, *err_br = NULL; |
| 314 |
if (do_error) { |
| 315 |
err_bp = (float *) (malloc(npix * sizeof(float))); |
| 316 |
err_bt = (float *) (malloc(npix * sizeof(float))); |
| 317 |
err_br = (float *) (malloc(npix * sizeof(float))); |
| 318 |
get_bptr_err(&ephem, dims, fld, inc, azi, lon, lat, |
| 319 |
err_fld, err_inc, err_azi, cc_fi, cc_fa, cc_ia, |
| 320 |
err_bp, err_bt, err_br); // working function, all input in rad |
| 321 |
} |
| 322 |
|
| 323 |
// Convert lon/lat to deg if needed |
| 324 |
|
| 325 |
if (do_lonlat) { |
| 326 |
for (int ipix = 0; ipix < npix; ipix++) { |
| 327 |
lon[ipix] /= RADSINDEG; |
| 328 |
lat[ipix] /= RADSINDEG; |
| 329 |
} |
| 330 |
} |
| 331 |
|
| 332 |
// Some clean up |
| 333 |
|
| 334 |
DRMS_FREE_ARR(inArray_fld); DRMS_FREE_ARR(inArray_inc); |
| 335 |
DRMS_FREE_ARR(inArray_azi); DRMS_FREE_ARR(inArray_amb); |
| 336 |
if (do_error) { |
| 337 |
DRMS_FREE_ARR(inArray_err_fld); DRMS_FREE_ARR(inArray_err_inc); DRMS_FREE_ARR(inArray_err_azi); |
| 338 |
DRMS_FREE_ARR(inArray_cc_fi); DRMS_FREE_ARR(inArray_cc_fa); DRMS_FREE_ARR(inArray_cc_ia); |
| 339 |
} |
| 340 |
if (!do_lonlat) { |
| 341 |
FREE_ARR(lon); FREE_ARR(lat); |
| 342 |
} |
| 343 |
|
| 344 |
// Output |
| 345 |
|
| 346 |
DRMS_Record_t *outRec = outRS->records[irec]; |
| 347 |
if (!outRec) |
| 348 |
{ |
| 349 |
fprintf(stderr, "No output record with index %d in record set.\n", irec); |
| 350 |
continue; |
| 351 |
} |
| 352 |
|
| 353 |
DRMS_Segment_t *outSeg_bp = drms_segment_lookup(outRec, "Bp"); |
| 354 |
if (!outSeg_bp) |
| 355 |
{ |
| 356 |
fprintf(stderr, "Missing required output segment 'Bp'.\n"); |
| 357 |
continue; |
| 358 |
} |
| 359 |
|
| 360 |
DRMS_Segment_t *outSeg_bt = drms_segment_lookup(outRec, "Bt"); |
| 361 |
if (!outSeg_bt) |
| 362 |
{ |
| 363 |
fprintf(stderr, "Missing required output segment 'Bt'.\n"); |
| 364 |
continue; |
| 365 |
} |
| 366 |
|
| 367 |
DRMS_Segment_t *outSeg_br = drms_segment_lookup(outRec, "Br"); |
| 368 |
if (!outSeg_br) |
| 369 |
{ |
| 370 |
fprintf(stderr, "Missing required output segment 'Br'.\n"); |
| 371 |
continue; |
| 372 |
} |
| 373 |
|
| 374 |
int status_bp = 0, status_bt = 0, status_br = 0; |
| 375 |
DRMS_Array_t *outArray_bp = NULL, *outArray_bt = NULL, *outArray_br = NULL; |
| 376 |
outArray_bp = drms_array_create(DRMS_TYPE_FLOAT, 2, dims, bp, &status_bp); |
| 377 |
outArray_bt = drms_array_create(DRMS_TYPE_FLOAT, 2, dims, bt, &status_bt); |
| 378 |
outArray_br = drms_array_create(DRMS_TYPE_FLOAT, 2, dims, br, &status_br); |
| 379 |
if (status_bp || status_bt || status_br) { |
| 380 |
printf("Writing output arrays error, record skipped\n"); |
| 381 |
DRMS_FREE_ARR(outArray_bp); DRMS_FREE_ARR(outArray_bt); DRMS_FREE_ARR(outArray_br); |
| 382 |
continue; |
| 383 |
} |
| 384 |
outArray_bp->israw = outArray_bt->israw = outArray_br->israw = 0; // always compressed |
| 385 |
outArray_bp->bzero = outSeg_bp->bzero; outArray_bp->bscale = outSeg_bp->bscale; |
| 386 |
outArray_bt->bzero = outSeg_bt->bzero; outArray_bt->bscale = outSeg_bt->bscale; |
| 387 |
outArray_br->bzero = outSeg_br->bzero; outArray_br->bscale = outSeg_br->bscale; |
| 388 |
|
| 389 |
status_bp = drms_segment_write(outSeg_bp, outArray_bp, 0); |
| 390 |
status_bt = drms_segment_write(outSeg_bt, outArray_bt, 0); |
| 391 |
status_br = drms_segment_write(outSeg_br, outArray_br, 0); |
| 392 |
DRMS_FREE_ARR(outArray_bp); DRMS_FREE_ARR(outArray_bt); DRMS_FREE_ARR(outArray_br); |
| 393 |
|
| 394 |
if (status_bp || status_bt || status_br) { |
| 395 |
printf("Writing output arrays error, record skipped\n"); |
| 396 |
continue; |
| 397 |
} |
| 398 |
|
| 399 |
// Optional output |
| 400 |
|
| 401 |
if (do_error) { |
| 402 |
DRMS_Segment_t *outSeg_err_bp = drms_segment_lookup(outRec, "Bp_err"); |
| 403 |
if (!outSeg_err_bp) |
| 404 |
{ |
| 405 |
fprintf(stderr, "Missing required output segment 'Bp_err'.\n"); |
| 406 |
continue; |
| 407 |
} |
| 408 |
|
| 409 |
DRMS_Segment_t *outSeg_err_bt = drms_segment_lookup(outRec, "Bt_err"); |
| 410 |
if (!outSeg_err_bt) |
| 411 |
{ |
| 412 |
fprintf(stderr, "Missing required output segment 'Bt_err'.\n"); |
| 413 |
continue; |
| 414 |
} |
| 415 |
|
| 416 |
DRMS_Segment_t *outSeg_err_br = drms_segment_lookup(outRec, "Br_err"); |
| 417 |
if (!outSeg_err_br) |
| 418 |
{ |
| 419 |
fprintf(stderr, "Missing required output segment 'Br_err'.\n"); |
| 420 |
continue; |
| 421 |
} |
| 422 |
|
| 423 |
int status_err_bp = 0, status_err_bt = 0, status_err_br = 0; |
| 424 |
DRMS_Array_t *outArray_err_bp = NULL, *outArray_err_bt = NULL, *outArray_err_br = NULL; |
| 425 |
outArray_err_bp = drms_array_create(DRMS_TYPE_FLOAT, 2, dims, err_bp, &status_err_bp); |
| 426 |
outArray_err_bt = drms_array_create(DRMS_TYPE_FLOAT, 2, dims, err_bt, &status_err_bt); |
| 427 |
outArray_err_br = drms_array_create(DRMS_TYPE_FLOAT, 2, dims, err_br, &status_err_br); |
| 428 |
if (status_err_bp || status_err_bt || status_err_br) { |
| 429 |
printf("Writing error output arrays error, record skipped\n"); |
| 430 |
DRMS_FREE_ARR(outArray_err_bp); DRMS_FREE_ARR(outArray_err_bt); DRMS_FREE_ARR(outArray_err_br); |
| 431 |
continue; |
| 432 |
} |
| 433 |
outArray_err_bp->israw = outArray_err_bt->israw = outArray_err_br->israw = 0; // always compressed, fixed Dec 23 2015 |
| 434 |
outArray_err_bp->bzero = outSeg_err_bp->bzero; outArray_err_bp->bscale = outSeg_err_bp->bscale; |
| 435 |
outArray_err_bt->bzero = outSeg_err_bt->bzero; outArray_err_bt->bscale = outSeg_err_bt->bscale; |
| 436 |
outArray_err_br->bzero = outSeg_err_br->bzero; outArray_err_br->bscale = outSeg_err_br->bscale; |
| 437 |
|
| 438 |
status_err_bp = drms_segment_write(outSeg_err_bp, outArray_err_bp, 0); |
| 439 |
status_err_bt = drms_segment_write(outSeg_err_bt, outArray_err_bt, 0); |
| 440 |
status_err_br = drms_segment_write(outSeg_err_br, outArray_err_br, 0); |
| 441 |
DRMS_FREE_ARR(outArray_err_bp); DRMS_FREE_ARR(outArray_err_bt); DRMS_FREE_ARR(outArray_err_br); |
| 442 |
|
| 443 |
if (status_err_bp || status_err_bt || status_err_br) { |
| 444 |
printf("Writing error output arrays error, record skipped\n"); |
| 445 |
continue; |
| 446 |
} |
| 447 |
} |
| 448 |
|
| 449 |
if (do_lonlat) { |
| 450 |
DRMS_Segment_t *outSeg_lon = drms_segment_lookup(outRec, "lon"); |
| 451 |
if (!outSeg_lon) |
| 452 |
{ |
| 453 |
fprintf(stderr, "Missing required output segment 'lon'.\n"); |
| 454 |
continue; |
| 455 |
} |
| 456 |
|
| 457 |
DRMS_Segment_t *outSeg_lat = drms_segment_lookup(outRec, "lat"); |
| 458 |
if (!outSeg_lon) |
| 459 |
{ |
| 460 |
fprintf(stderr, "Missing required output segment 'lat'.\n"); |
| 461 |
continue; |
| 462 |
} |
| 463 |
|
| 464 |
int status_lon = 0, status_lat = 0; |
| 465 |
DRMS_Array_t *outArray_lon = NULL, *outArray_lat = NULL; |
| 466 |
outArray_lon = drms_array_create(DRMS_TYPE_FLOAT, 2, dims, lon, &status_lon); |
| 467 |
outArray_lat = drms_array_create(DRMS_TYPE_FLOAT, 2, dims, lat, &status_lat); |
| 468 |
if (status_lon || status_lat) { |
| 469 |
printf("Writing lon/lat arrays error, record skipped\n"); |
| 470 |
DRMS_FREE_ARR(outArray_lon); DRMS_FREE_ARR(outArray_lat); |
| 471 |
continue; |
| 472 |
} |
| 473 |
outArray_lon->israw = outArray_lat->israw = 0; // always compressed |
| 474 |
outArray_lon->bzero = outSeg_lon->bzero; outArray_lon->bscale = outSeg_lon->bscale; |
| 475 |
outArray_lat->bzero = outSeg_lat->bzero; outArray_lat->bscale = outSeg_lat->bscale; |
| 476 |
|
| 477 |
status_lon = drms_segment_write(outSeg_lon, outArray_lon, 0); |
| 478 |
status_lat = drms_segment_write(outSeg_lat, outArray_lat, 0); |
| 479 |
DRMS_FREE_ARR(outArray_lon); DRMS_FREE_ARR(outArray_lat); |
| 480 |
|
| 481 |
if (status_lon || status_lat) { |
| 482 |
printf("Writing lon/lat arrays error, record skipped\n"); |
| 483 |
continue; |
| 484 |
} |
| 485 |
} |
| 486 |
|
| 487 |
// Keywords |
| 488 |
|
| 489 |
drms_copykeys(outRec, inRec, 0, 0); // copy all keys |
| 490 |
|
| 491 |
TIME val, trec, tnow, UNIX_epoch = -220924792.000; /* 1970.01.01_00:00:00_UTC */ |
| 492 |
tnow = (double)time(NULL); |
| 493 |
tnow += UNIX_epoch; |
| 494 |
drms_setkey_time(outRec, "DATE", tnow); |
| 495 |
drms_setkey_int(outRec, "AMBWEAK", ambweak); |
| 496 |
drms_setkey_string(outRec, "RequestID", requestid); |
| 497 |
drms_setkey_string(outRec, "BUNIT_000", "Mx/cm^2"); |
| 498 |
drms_setkey_string(outRec, "BUNIT_001", "Mx/cm^2"); |
| 499 |
drms_setkey_string(outRec, "BUNIT_002", "Mx/cm^2"); |
| 500 |
drms_setkey_string(outRec, "BUNIT_003", "Mx/cm^2"); |
| 501 |
drms_setkey_string(outRec, "BUNIT_004", "Mx/cm^2"); |
| 502 |
drms_setkey_string(outRec, "BUNIT_005", "Mx/cm^2"); |
| 503 |
drms_setkey_string(outRec, "BUNIT_006", "degree"); |
| 504 |
drms_setkey_string(outRec, "BUNIT_007", "degree"); |
| 505 |
|
| 506 |
} // irec |
| 507 |
|
| 508 |
drms_close_records(inRS, DRMS_FREE_RECORD); |
| 509 |
drms_close_records(outRS, DRMS_INSERT_RECORD); |
| 510 |
|
| 511 |
return 0; |
| 512 |
|
| 513 |
} // DoIt |
| 514 |
|
| 515 |
|
| 516 |
//================================================================================================= |
| 517 |
|
| 518 |
/* |
| 519 |
* Fetch ephemeris info from a DRMS record |
| 520 |
* No error checking for now |
| 521 |
* |
| 522 |
*/ |
| 523 |
|
| 524 |
int getEphemeris(DRMS_Record_t *inRec, struct ephemeris *ephem) |
| 525 |
{ |
| 526 |
|
| 527 |
int status = 0; |
| 528 |
|
| 529 |
float crota2 = drms_getkey_float(inRec, "CROTA2", &status); // rotation |
| 530 |
double sina = sin(crota2 * RADSINDEG); |
| 531 |
double cosa = cos(crota2 * RADSINDEG); |
| 532 |
|
| 533 |
ephem->pa = - crota2 * RADSINDEG; |
| 534 |
ephem->disk_latc = drms_getkey_float(inRec, "CRLT_OBS", &status) * RADSINDEG; |
| 535 |
ephem->disk_lonc = drms_getkey_float(inRec, "CRLN_OBS", &status) * RADSINDEG; |
| 536 |
|
| 537 |
float crvalx = 0.0; |
| 538 |
float crvaly = 0.0; |
| 539 |
float crpix1 = drms_getkey_float(inRec, "CRPIX1", &status); |
| 540 |
float crpix2 = drms_getkey_float(inRec, "CRPIX2", &status); |
| 541 |
float cdelt = drms_getkey_float(inRec, "CDELT1", &status); // in arcsec, assumimg dx=dy |
| 542 |
ephem->disk_xc = PIX_X(0.0,0.0) - 1.0; // Center of disk in pixel, starting at 0 |
| 543 |
ephem->disk_yc = PIX_Y(0.0,0.0) - 1.0; |
| 544 |
|
| 545 |
float dSun = drms_getkey_float(inRec, "DSUN_OBS", &status); |
| 546 |
float rSun_ref = drms_getkey_float(inRec, "RSUN_REF", &status); |
| 547 |
if (status) rSun_ref = 6.96e8; |
| 548 |
|
| 549 |
ephem->asd = asin(rSun_ref/dSun); |
| 550 |
ephem->rSun = asin(rSun_ref / dSun) * RAD2ARCSEC / cdelt; // in pixel |
| 551 |
|
| 552 |
return 0; |
| 553 |
|
| 554 |
} |
| 555 |
|
| 556 |
/* Convert field vector, calls img2helioVector */ |
| 557 |
void get_bptr(struct ephemeris *ephem, int *dims, float *fld, float *inc, float *azi, |
| 558 |
float *bp, float *bt, float *br, float *lon, float *lat) |
| 559 |
{ |
| 560 |
int ncols = dims[0], nrows = dims[1]; |
| 561 |
int ipix = 0; |
| 562 |
|
| 563 |
double lonc = 0., latc = ephem->disk_latc; // iput |
| 564 |
double xc = ephem->disk_xc, yc = ephem->disk_yc; |
| 565 |
double asd = ephem->asd, pa = ephem->pa, rSun = ephem->rSun; |
| 566 |
double x, y, b_xi, b_eta, b_zeta; |
| 567 |
double rho, lat_t, lon_t, sinlat_t, coslat_t, sig, mu, chi; // output |
| 568 |
double bx_t, by_t, bz_t; |
| 569 |
// printf("xc=%f, yc=%f, rSun=%f\n", xc, yc, rSun); |
| 570 |
|
| 571 |
for (int row = 0; row < nrows; row++) { |
| 572 |
for (int col = 0; col < ncols; col++) { |
| 573 |
ipix = row * ncols + col; |
| 574 |
|
| 575 |
// lon/lat |
| 576 |
x = (col - xc) / rSun; y = (row - yc) / rSun; |
| 577 |
if (img2sphere(x, y, asd, latc, lonc, pa, |
| 578 |
&rho, &lat_t, &lon_t, &sinlat_t, &coslat_t, |
| 579 |
&sig, &mu, &chi)) { // fail |
| 580 |
lon[ipix] = lat[ipix] = DRMS_MISSING_FLOAT; |
| 581 |
bp[ipix] = bt[ipix] = br[ipix] = DRMS_MISSING_FLOAT; |
| 582 |
continue; |
| 583 |
} |
| 584 |
if (lon_t > PI) lon_t -= TWOPI; |
| 585 |
lon[ipix] = lon_t; lat[ipix] = lat_t; |
| 586 |
|
| 587 |
// Bvec |
| 588 |
b_xi = - fld[ipix] * sin(inc[ipix]) * sin(azi[ipix]); |
| 589 |
b_eta = fld[ipix] * sin(inc[ipix]) * cos(azi[ipix]); |
| 590 |
b_zeta = fld[ipix] * cos(inc[ipix]); |
| 591 |
img2helioVector(b_xi, b_eta, b_zeta, &bx_t, &by_t, &bz_t, |
| 592 |
lon_t, lat_t, lonc, latc, pa); |
| 593 |
bp[ipix] = bx_t; |
| 594 |
bt[ipix] = by_t * (-1); |
| 595 |
br[ipix] = bz_t; |
| 596 |
} |
| 597 |
} |
| 598 |
} |
| 599 |
|
| 600 |
/* Compute error, calls errprop_rad */ |
| 601 |
void get_bptr_err(struct ephemeris *ephem, int *dims, float *fld, float *inc, float *azi, |
| 602 |
float *lon, float *lat, |
| 603 |
float *err_fld, float *err_inc, float *err_azi, float *cc_fi, float *cc_fa, float *cc_ia, |
| 604 |
float *err_bp, float *err_bt, float *err_br) |
| 605 |
{ |
| 606 |
int ncols = dims[0], nrows = dims[1]; |
| 607 |
int npix = ncols * nrows; |
| 608 |
|
| 609 |
double lonc = 0., latc = ephem->disk_latc, pa = ephem->pa; // Dec 23 2015, changed lonc from disc_lonc to 0. |
| 610 |
|
| 611 |
float var_fld, var_inc, var_azi; // variance |
| 612 |
float cov_fi, cov_fa, cov_ia; // covariance |
| 613 |
|
| 614 |
double var_bp, var_bt, var_br; |
| 615 |
|
| 616 |
for (int ipix = 0; ipix < npix; ipix++) { |
| 617 |
if (isnan(lon[ipix])) { |
| 618 |
err_bp[ipix] = err_bt[ipix] = err_br[ipix] = DRMS_MISSING_FLOAT; |
| 619 |
continue; |
| 620 |
} |
| 621 |
|
| 622 |
// variance & covariance |
| 623 |
var_fld = err_fld[ipix] * err_fld[ipix]; |
| 624 |
var_inc = err_inc[ipix] * err_inc[ipix]; |
| 625 |
var_azi = err_azi[ipix] * err_azi[ipix]; |
| 626 |
cov_fi = cc_fi[ipix] * err_fld[ipix] * err_inc[ipix]; |
| 627 |
cov_fa = cc_fa[ipix] * err_fld[ipix] * err_azi[ipix]; |
| 628 |
cov_ia = cc_ia[ipix] * err_inc[ipix] * err_azi[ipix]; |
| 629 |
|
| 630 |
// Do it |
| 631 |
vecErrProp(fld[ipix], inc[ipix], azi[ipix], var_fld, var_inc, var_azi, cov_fi, cov_fa, cov_ia, |
| 632 |
lon[ipix], lat[ipix], lonc, latc, pa, &var_bp, &var_bt, &var_br); |
| 633 |
err_bp[ipix] = sqrt(var_bp); |
| 634 |
err_bt[ipix] = sqrt(var_bt); |
| 635 |
err_br[ipix] = sqrt(var_br); |
| 636 |
} |
| 637 |
} |
| 638 |
|
| 639 |
// From img2helioVector.c |
| 640 |
int img2helioVector (double bxImg, double byImg, double bzImg, double *bxHelio, |
| 641 |
double *byHelio, double *bzHelio, double lon, double lat, |
| 642 |
double lonc, double latc, double pAng) { |
| 643 |
/* |
| 644 |
* perform tramsformation of a vector from image location (lon, lat) to |
| 645 |
* heliographic center. The formula is from Hagyard (1987), and further |
| 646 |
* developed by Gary & Hagyard (1990). |
| 647 |
* |
| 648 |
* Arguments: |
| 649 |
* |
| 650 |
* bxImg, byImg, bzImg: three components of vector magnetic field on image |
| 651 |
* coordinates. |
| 652 |
* lon, lat: heliographic coordinates of the location where the vector field |
| 653 |
* measured. They are in radians. |
| 654 |
* lonc, latc: heliographic coordinates of the image disk center. They are in |
| 655 |
* radians. |
| 656 |
* pAng: position angle of the heliographic north pole, measured eastward |
| 657 |
* from the north. It's in radians. |
| 658 |
*/ |
| 659 |
|
| 660 |
static double raddeg = M_PI / 180.; |
| 661 |
double a11, a12, a13, a21, a22, a23, a31, a32, a33; |
| 662 |
|
| 663 |
a11 = -sin(latc) * sin(pAng) * sin(lon - lonc) + cos(pAng) * cos(lon - lonc); |
| 664 |
a12 = sin(latc) * cos(pAng) * sin(lon - lonc) + sin(pAng) * cos(lon - lonc); |
| 665 |
a13 = -cos(latc) * sin(lon - lonc); |
| 666 |
a21 = -sin(lat) * (sin(latc) * sin(pAng) * cos(lon - lonc) + cos(pAng) * sin(lon - lonc)) |
| 667 |
- cos(lat) * cos(latc) * sin(pAng); |
| 668 |
a22 = sin(lat) * (sin(latc) * cos(pAng) * cos(lon - lonc) - sin(pAng) * sin(lon - lonc)) |
| 669 |
+ cos(lat) * cos(latc) * cos(pAng); |
| 670 |
a23 = -cos(latc) * sin(lat) * cos(lon - lonc) + sin(latc) * cos(lat); |
| 671 |
a31 = cos(lat) * (sin(latc) * sin(pAng) * cos(lon - lonc) + cos(pAng) * sin(lon - lonc)) |
| 672 |
- sin(lat) * cos(latc) * sin(pAng); |
| 673 |
a32 = -cos(lat) * (sin(latc) * cos(pAng) * cos(lon - lonc) - sin(pAng) * sin(lon - lonc)) |
| 674 |
+ sin(lat) * cos(latc) * cos(pAng); |
| 675 |
a33 = cos(lat) * cos(latc) * cos(lon - lonc) + sin(lat) * sin(latc); |
| 676 |
|
| 677 |
*bxHelio = a11 * bxImg + a12 * byImg + a13 * bzImg; |
| 678 |
*byHelio = a21 * bxImg + a22 * byImg + a23 * bzImg; |
| 679 |
*bzHelio = a31 * bxImg + a32 * byImg + a33 * bzImg; |
| 680 |
|
| 681 |
return 0; |
| 682 |
} |
| 683 |
|
| 684 |
|
| 685 |
// Error propagation for vector field |
| 686 |
// Adapted from Yang's errorprop.c |
| 687 |
// All angles in radian |
| 688 |
// By or Bt=-By doesn't matter (all terms are squared) |
| 689 |
|
| 690 |
void vecErrProp(float fld, float inc, float azi, |
| 691 |
float var_fld, float var_inc, float var_azi, float cov_fi, float cov_fa, float cov_ia, |
| 692 |
double lon, double lat, double lonc, double latc, double pa, |
| 693 |
double *var_bp, double *var_bt, double *var_br) |
| 694 |
|
| 695 |
{ |
| 696 |
|
| 697 |
// Coefficients |
| 698 |
|
| 699 |
double a11, a12, a13, a21, a22, a23, a31, a32, a33; |
| 700 |
a11 = - sin(latc) * sin(pa) * sin(lon - lonc) + cos(pa) * cos(lon - lonc); |
| 701 |
a12 = sin(latc) * cos(pa) * sin(lon - lonc) + sin(pa) * cos(lon - lonc); |
| 702 |
a13 = - cos(latc) * sin(lon - lonc); |
| 703 |
a21 = - sin(lat) * (sin(latc) * sin(pa) * cos(lon - lonc) + cos(pa) * sin(lon - lonc)) |
| 704 |
- cos(lat) * cos(latc) * sin(pa); |
| 705 |
a22 = sin(lat) * (sin(latc) * cos(pa) * cos(lon - lonc) - sin(pa) * sin(lon - lonc)) |
| 706 |
+ cos(lat) * cos(latc) * cos(pa); |
| 707 |
a23 = - cos(latc) * sin(lat) * cos(lon - lonc) + sin(latc) * cos(lat); |
| 708 |
a31 = cos(lat) * (sin(latc) * sin(pa) * cos(lon - lonc) + cos(pa) * sin(lon - lonc)) |
| 709 |
- sin(lat) * cos(latc) * sin(pa); |
| 710 |
a32 = - cos(lat) * (sin(latc) * cos(pa) * cos(lon - lonc) - sin(pa) * sin(lon - lonc)) |
| 711 |
+ sin(lat) * cos(latc) * cos(pa); |
| 712 |
a33 = cos(lat) * cos(latc) * cos(lon - lonc) + sin(lat) * sin(latc); |
| 713 |
|
| 714 |
// Derivative |
| 715 |
|
| 716 |
double dBpdfld, dBpdinc, dBpdazi; |
| 717 |
double dBtdfld, dBtdinc, dBtdazi; |
| 718 |
double dBrdfld, dBrdinc, dBrdazi; |
| 719 |
|
| 720 |
dBpdfld = (- a11 * sin(inc) * sin(azi) + a12 * sin(inc) * cos(azi) + a13 * cos(inc)); |
| 721 |
dBpdinc = fld * (- a11 * cos(inc) * sin(azi) + a12 * cos(inc) * cos(azi) - a13 * sin(inc)); |
| 722 |
dBpdazi = fld * (- a11 * sin(inc) * cos(azi) - a12 * sin(inc) * sin(azi)); |
| 723 |
|
| 724 |
dBtdfld = (- a21 * sin(inc) * sin(azi) + a22 * sin(inc) * cos(azi) + a23 * cos(inc)); |
| 725 |
dBtdinc = fld * (- a21 * cos(inc) * sin(azi) + a22 * cos(inc) * cos(azi) - a23 * sin(inc)); |
| 726 |
dBtdazi = fld * (- a21 * sin(inc) * cos(azi) - a22 * sin(inc) * sin(azi)); |
| 727 |
|
| 728 |
dBrdfld = (- a31 * sin(inc) * sin(azi) + a32 * sin(inc) * cos(azi) + a33 * cos(inc)); |
| 729 |
dBrdinc = fld * (- a31 * cos(inc) * sin(azi) + a32 * cos(inc) * cos(azi) - a33 * sin(inc)); |
| 730 |
dBrdazi = fld * (- a31 * sin(inc) * cos(azi) - a32 * sin(inc) * sin(azi)); |
| 731 |
|
| 732 |
// Sum |
| 733 |
|
| 734 |
*var_bp = dBpdfld * dBpdfld * var_fld + dBpdinc * dBpdinc * var_inc + dBpdazi * dBpdazi * var_azi + |
| 735 |
2.0 * dBpdfld * dBpdinc * cov_fi + 2.0 * dBpdfld * dBpdazi * cov_fa + 2.0 * dBpdinc * dBpdazi * cov_ia; |
| 736 |
|
| 737 |
*var_bt = dBtdfld * dBtdfld * var_fld + dBtdinc * dBtdinc * var_inc + dBtdazi * dBtdazi * var_azi + |
| 738 |
2.0 * dBtdfld * dBtdinc * cov_fi + 2.0 * dBtdfld * dBtdazi * cov_fa + 2.0 * dBtdinc * dBtdazi * cov_ia; |
| 739 |
|
| 740 |
*var_br = dBrdfld * dBrdfld * var_fld + dBrdinc * dBrdinc * var_inc + dBrdazi * dBrdazi * var_azi + |
| 741 |
2.0 * dBrdfld * dBrdinc * cov_fi + 2.0 * dBrdfld * dBrdazi * cov_fa + 2.0 * dBrdinc * dBrdazi * cov_ia; |
| 742 |
|
| 743 |
} |
| 744 |
|
| 745 |
// from Cartography.c |
| 746 |
int img2sphere (double x, double y, double ang_r, double latc, double lonc, |
| 747 |
double pa, double *rho, double *lat, double *lon, double *sinlat, |
| 748 |
double *coslat, double *sig, double *mu, double *chi) { |
| 749 |
/* |
| 750 |
* Map projected coordinates (x, y) to (lon, lat) and (rho | sig, chi) |
| 751 |
* |
| 752 |
* Arguments: |
| 753 |
* x } Plate locations, in units of the image radius, relative |
| 754 |
* y } to the image center |
| 755 |
* ang_r Apparent semi-diameter of sun (angular radius of sun at |
| 756 |
* the observer's tangent line) |
| 757 |
* latc Latitude of disc center, uncorrected for light travel time |
| 758 |
* lonc Longitude of disc center |
| 759 |
* pa Position angle of solar north on image, measured eastward |
| 760 |
* from north (sky coordinates) |
| 761 |
* Return values: |
| 762 |
* rho Angle point:sun_center:observer |
| 763 |
* lon Heliographic longitude |
| 764 |
* lat Heliographic latitude |
| 765 |
* sinlat sine of heliographic latitude |
| 766 |
* coslat cosine of heliographic latitude |
| 767 |
* sig Angle point:observer:sun_center |
| 768 |
* mu cosine of angle between the point:observer line and the |
| 769 |
* local normal |
| 770 |
* chi Position angle on image measured westward from solar |
| 771 |
* north |
| 772 |
* |
| 773 |
* All angles are in radians. |
| 774 |
* Return value is 1 if point is outside solar radius (in which case the |
| 775 |
* heliographic coordinates and mu are meaningless), 0 otherwise. |
| 776 |
* It is assumed that the image is direct; the x or y coordinates require a |
| 777 |
* sign change if the image is inverted. |
| 778 |
* |
| 779 |
*/ |
| 780 |
static double ang_r0 = 0.0, sinang_r = 0.0, tanang_r = 0.0; |
| 781 |
static double latc0 = 0.0, coslatc = 1.0, sinlatc = 0.0; |
| 782 |
double cosr, sinr, sinlon, sinsig; |
| 783 |
|
| 784 |
if (ang_r != ang_r0) { |
| 785 |
sinang_r = sin (ang_r); |
| 786 |
tanang_r = tan (ang_r); |
| 787 |
ang_r0 = ang_r; |
| 788 |
} |
| 789 |
if (latc != latc0) { |
| 790 |
sinlatc = sin (latc); |
| 791 |
coslatc = cos (latc); |
| 792 |
latc0 = latc; |
| 793 |
} |
| 794 |
*chi = atan2 (x, y) + pa; |
| 795 |
while (*chi > 2 * M_PI) *chi -= 2 * M_PI; |
| 796 |
while (*chi < 0.0) *chi += 2 * M_PI; |
| 797 |
/* Camera curvature correction, no small angle approximations */ |
| 798 |
*sig = atan (hypot (x, y) * tanang_r); |
| 799 |
sinsig = sin (*sig); |
| 800 |
*rho = asin (sinsig / sinang_r) - *sig; |
| 801 |
if (*sig > ang_r) return (-1); |
| 802 |
*mu = cos (*rho + *sig); |
| 803 |
sinr = sin (*rho); |
| 804 |
cosr = cos (*rho); |
| 805 |
|
| 806 |
*sinlat = sinlatc * cos (*rho) + coslatc * sinr * cos (*chi); |
| 807 |
*coslat = sqrt (1.0 - *sinlat * *sinlat); |
| 808 |
*lat = asin (*sinlat); |
| 809 |
sinlon = sinr * sin (*chi) / *coslat; |
| 810 |
*lon = asin (sinlon); |
| 811 |
if (cosr < (*sinlat * sinlatc)) *lon = M_PI - *lon; |
| 812 |
*lon += lonc; |
| 813 |
while (*lon < 0.0) *lon += 2 * M_PI; |
| 814 |
while (*lon >= 2 * M_PI) *lon -= 2 * M_PI; |
| 815 |
return (0); |
| 816 |
} |
