247 |
|
}; |
248 |
|
|
249 |
|
#ifndef NSUNPATCH |
250 |
< |
#define NSUNPATCH 4 /* # patches to spread sun into */ |
250 |
> |
#define NSUNPATCH 4 /* max. # patches to spread sun into */ |
251 |
|
#endif |
252 |
|
|
253 |
|
extern int jdate(int month, int day); |
260 |
|
extern double s_longitude; |
261 |
|
extern double s_meridian; |
262 |
|
|
263 |
< |
double grefl = 0.2; /* diffuse ground reflectance */ |
263 |
> |
int nsuns = NSUNPATCH; /* number of sun patches to use */ |
264 |
> |
double fixed_sun_sa = -1; /* fixed solid angle per sun? */ |
265 |
|
|
266 |
|
int verbose = 0; /* progress reports to stderr? */ |
267 |
|
|
269 |
|
|
270 |
|
int rhsubdiv = 1; /* Reinhart sky subdivisions */ |
271 |
|
|
272 |
< |
float skycolor[3] = {.96, 1.004, 1.118}; /* sky coloration */ |
272 |
> |
COLOR skycolor = {.96, 1.004, 1.118}; /* sky coloration */ |
273 |
> |
COLOR suncolor = {1., 1., 1.}; /* sun color */ |
274 |
> |
COLOR grefl = {.2, .2, .2}; /* ground reflectance */ |
275 |
|
|
273 |
– |
int do_sun = 1; /* output direct solar contribution? */ |
274 |
– |
|
276 |
|
int nskypatch; /* number of Reinhart patches */ |
277 |
|
float *rh_palt; /* sky patch altitudes (radians) */ |
278 |
|
float *rh_pazi; /* sky patch azimuths (radians) */ |
295 |
|
main(int argc, char *argv[]) |
296 |
|
{ |
297 |
|
char buf[256]; |
298 |
+ |
double rotation = 0; /* site rotation (degrees) */ |
299 |
|
double elevation; /* site elevation (meters) */ |
300 |
|
int dir_is_horiz; /* direct is meas. on horizontal? */ |
301 |
|
float *mtx_data = NULL; /* our matrix data */ |
311 |
|
/* get options */ |
312 |
|
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
313 |
|
switch (argv[i][1]) { |
314 |
< |
case 'g': |
315 |
< |
grefl = atof(argv[++i]); |
314 |
> |
case 'g': /* ground reflectance */ |
315 |
> |
grefl[0] = atof(argv[++i]); |
316 |
> |
grefl[1] = atof(argv[++i]); |
317 |
> |
grefl[2] = atof(argv[++i]); |
318 |
|
break; |
319 |
< |
case 'v': |
319 |
> |
case 'v': /* verbose progress reports */ |
320 |
|
verbose++; |
321 |
|
break; |
322 |
< |
case 'o': |
322 |
> |
case 'o': /* output format */ |
323 |
|
switch (argv[i][2]) { |
324 |
|
case 'f': |
325 |
|
case 'd': |
330 |
|
goto userr; |
331 |
|
} |
332 |
|
break; |
333 |
< |
case 'm': |
333 |
> |
case 'm': /* Reinhart subdivisions */ |
334 |
|
rhsubdiv = atoi(argv[++i]); |
335 |
|
break; |
336 |
< |
case 'c': |
336 |
> |
case 'c': /* sky color */ |
337 |
|
skycolor[0] = atof(argv[++i]); |
338 |
|
skycolor[1] = atof(argv[++i]); |
339 |
|
skycolor[2] = atof(argv[++i]); |
340 |
|
break; |
341 |
< |
case 'd': |
338 |
< |
do_sun = 1; |
341 |
> |
case 'd': /* solar (direct) only */ |
342 |
|
skycolor[0] = skycolor[1] = skycolor[2] = 0; |
343 |
+ |
if (suncolor[1] <= 1e-4) |
344 |
+ |
suncolor[0] = suncolor[1] = suncolor[2] = 1; |
345 |
|
break; |
346 |
< |
case 's': |
347 |
< |
do_sun = 0; |
346 |
> |
case 's': /* sky only (no direct) */ |
347 |
> |
suncolor[0] = suncolor[1] = suncolor[2] = 0; |
348 |
|
if (skycolor[1] <= 1e-4) |
349 |
|
skycolor[0] = skycolor[1] = skycolor[2] = 1; |
350 |
|
break; |
351 |
+ |
case 'r': /* rotate distribution */ |
352 |
+ |
if (argv[i][2] && argv[i][2] != 'z') |
353 |
+ |
goto userr; |
354 |
+ |
rotation = atof(argv[++i]); |
355 |
+ |
break; |
356 |
+ |
case '5': /* 5-phase calculation */ |
357 |
+ |
nsuns = 1; |
358 |
+ |
fixed_sun_sa = 6.797e-05; |
359 |
+ |
break; |
360 |
|
default: |
361 |
|
goto userr; |
362 |
|
} |
411 |
|
progname, s_latitude, s_longitude); |
412 |
|
fprintf(stderr, "%s: %d sky patches per time step\n", |
413 |
|
progname, nskypatch); |
414 |
+ |
if (rotation != 0) |
415 |
+ |
fprintf(stderr, "%s: rotating output %.0f degrees\n", |
416 |
+ |
progname, rotation); |
417 |
|
} |
418 |
|
/* convert quantities to radians */ |
419 |
|
s_latitude = DegToRad(s_latitude); |
437 |
|
sda = sdec(julian_date); |
438 |
|
sta = stadj(julian_date); |
439 |
|
altitude = salt(sda, hr+sta); |
440 |
< |
azimuth = sazi(sda, hr+sta) + PI; |
440 |
> |
azimuth = sazi(sda, hr+sta) + PI - DegToRad(rotation); |
441 |
|
/* convert measured values */ |
442 |
|
if (dir_is_horiz && altitude > 0.) |
443 |
|
dir /= sin(altitude); |
450 |
|
} |
451 |
|
/* compute sky patch values */ |
452 |
|
ComputeSky(mtx_data+mtx_offset); |
453 |
< |
if (do_sun) |
437 |
< |
AddDirect(mtx_data+mtx_offset); |
453 |
> |
AddDirect(mtx_data+mtx_offset); |
454 |
|
} |
455 |
|
/* check for junk at end */ |
456 |
|
while ((i = fgetc(stdin)) != EOF) |
510 |
|
fprintf(stderr, "%s: done.\n", progname); |
511 |
|
exit(0); |
512 |
|
userr: |
513 |
< |
fprintf(stderr, "Usage: %s [-v][-d|-s][-m N][-g refl][-c r g b][-o{f|d}] [tape.wea]\n", |
513 |
> |
fprintf(stderr, "Usage: %s [-v][-d|-s][-r deg][-m N][-g r g b][-c r g b][-o{f|d}] [tape.wea]\n", |
514 |
|
progname); |
515 |
|
exit(1); |
516 |
|
fmterr: |
531 |
|
{ |
532 |
|
int index; /* Category index */ |
533 |
|
double norm_diff_illum; /* Normalized diffuse illuimnance */ |
518 |
– |
double zlumin; /* Zenith luminance */ |
534 |
|
int i; |
535 |
|
|
536 |
|
/* Calculate atmospheric precipitable water content */ |
537 |
|
apwc = CalcPrecipWater(dew_point); |
538 |
|
|
539 |
< |
/* Limit solar altitude to keep circumsolar off zenith */ |
540 |
< |
if (altitude > DegToRad(87.0)) |
541 |
< |
altitude = DegToRad(87.0); |
539 |
> |
/* Calculate sun zenith angle (don't let it dip below horizon) */ |
540 |
> |
/* Also limit minimum angle to keep circumsolar off zenith */ |
541 |
> |
if (altitude <= 0.0) |
542 |
> |
sun_zenith = DegToRad(90.0); |
543 |
> |
else if (altitude >= DegToRad(87.0)) |
544 |
> |
sun_zenith = DegToRad(3.0); |
545 |
> |
else |
546 |
> |
sun_zenith = DegToRad(90.0) - altitude; |
547 |
|
|
528 |
– |
/* Calculate sun zenith angle */ |
529 |
– |
sun_zenith = DegToRad(90.0) - altitude; |
530 |
– |
|
548 |
|
/* Compute the inputs for the calculation of the sky distribution */ |
549 |
|
|
550 |
|
if (input == 0) /* XXX never used */ |
563 |
|
sky_brightness = CalcSkyBrightness(); |
564 |
|
sky_clearness = CalcSkyClearness(); |
565 |
|
|
566 |
+ |
/* Limit sky clearness */ |
567 |
+ |
if (sky_clearness > 11.9) |
568 |
+ |
sky_clearness = 11.9; |
569 |
+ |
|
570 |
+ |
/* Limit sky brightness */ |
571 |
+ |
if (sky_brightness < 0.01) |
572 |
+ |
sky_brightness = 0.01; |
573 |
+ |
|
574 |
|
/* Calculate illuminance */ |
575 |
|
index = GetCategoryIndex(); |
576 |
|
diff_illum = diff_irrad * CalcDiffuseIllumRatio(index); |
590 |
|
parr[0] = diff_illum; |
591 |
|
if (altitude > 0) |
592 |
|
parr[0] += dir_illum * sin(altitude); |
593 |
< |
parr[2] = parr[1] = parr[0] *= grefl*(1./PI/WHTEFFICACY); |
593 |
> |
parr[2] = parr[1] = parr[0] *= (1./PI/WHTEFFICACY); |
594 |
> |
multcolor(parr, grefl); |
595 |
|
|
596 |
|
/* Calculate Perez sky model parameters */ |
597 |
|
CalcPerezParam(sun_zenith, sky_clearness, sky_brightness, index); |
605 |
|
/* Normalization coefficient */ |
606 |
|
norm_diff_illum = diff_illum / norm_diff_illum; |
607 |
|
|
582 |
– |
/* Calculate relative zenith luminance */ |
583 |
– |
zlumin = CalcRelLuminance(sun_zenith, 0.0); |
584 |
– |
|
585 |
– |
/* Calculate absolute zenith illuminance */ |
586 |
– |
zlumin *= norm_diff_illum; |
587 |
– |
|
608 |
|
/* Apply to sky patches to get absolute radiance values */ |
609 |
|
for (i = 1; i < nskypatch; i++) { |
610 |
< |
scalecolor(parr+3*i, zlumin*(1./WHTEFFICACY)); |
610 |
> |
scalecolor(parr+3*i, norm_diff_illum*(1./WHTEFFICACY)); |
611 |
|
multcolor(parr+3*i, skycolor); |
612 |
|
} |
613 |
|
} |
622 |
|
double wta[NSUNPATCH], wtot; |
623 |
|
int i, j, p; |
624 |
|
|
625 |
< |
if (!do_sun || dir_illum < 1e-4) |
625 |
> |
if (dir_illum <= 1e-4 || bright(suncolor) <= 1e-4) |
626 |
|
return; |
627 |
< |
/* identify NSUNPATCH closest patches */ |
628 |
< |
for (i = NSUNPATCH; i--; ) |
627 |
> |
/* identify nsuns closest patches */ |
628 |
> |
if (nsuns > NSUNPATCH) |
629 |
> |
nsuns = NSUNPATCH; |
630 |
> |
else if (nsuns <= 0) |
631 |
> |
nsuns = 1; |
632 |
> |
for (i = nsuns; i--; ) |
633 |
|
near_dprod[i] = -1.; |
634 |
|
vector(svec, altitude, azimuth); |
635 |
|
for (p = 1; p < nskypatch; p++) { |
637 |
|
double dprod; |
638 |
|
rh_vector(pvec, p); |
639 |
|
dprod = DOT(pvec, svec); |
640 |
< |
for (i = 0; i < NSUNPATCH; i++) |
640 |
> |
for (i = 0; i < nsuns; i++) |
641 |
|
if (dprod > near_dprod[i]) { |
642 |
< |
for (j = NSUNPATCH; --j > i; ) { |
642 |
> |
for (j = nsuns; --j > i; ) { |
643 |
|
near_dprod[j] = near_dprod[j-1]; |
644 |
|
near_patch[j] = near_patch[j-1]; |
645 |
|
} |
649 |
|
} |
650 |
|
} |
651 |
|
wtot = 0; /* weight by proximity */ |
652 |
< |
for (i = NSUNPATCH; i--; ) |
652 |
> |
for (i = nsuns; i--; ) |
653 |
|
wtot += wta[i] = 1./(1.002 - near_dprod[i]); |
654 |
|
/* add to nearest patch radiances */ |
655 |
< |
for (i = NSUNPATCH; i--; ) { |
655 |
> |
for (i = nsuns; i--; ) { |
656 |
|
float *pdest = parr + 3*near_patch[i]; |
657 |
< |
float val_add = wta[i] * dir_illum / |
658 |
< |
(WHTEFFICACY * wtot * rh_dom[near_patch[i]]); |
659 |
< |
*pdest++ += val_add; |
660 |
< |
*pdest++ += val_add; |
661 |
< |
*pdest++ += val_add; |
657 |
> |
float val_add = wta[i] * dir_illum / (WHTEFFICACY * wtot); |
658 |
> |
|
659 |
> |
val_add /= (fixed_sun_sa > 0) ? fixed_sun_sa |
660 |
> |
: rh_dom[near_patch[i]] ; |
661 |
> |
*pdest++ += val_add*suncolor[0]; |
662 |
> |
*pdest++ += val_add*suncolor[1]; |
663 |
> |
*pdest++ += val_add*suncolor[2]; |
664 |
|
} |
665 |
|
} |
666 |
|
|
858 |
|
sky_clearness = 12.0; |
859 |
|
|
860 |
|
/* Limit sky brightness */ |
861 |
< |
if (sky_brightness < 0.05) |
861 |
> |
if (sky_brightness < 0.01) |
862 |
|
sky_brightness = 0.01; |
863 |
|
|
864 |
|
while (((fabs(diff_irrad - test1) > 10.0) || |
882 |
|
sky_clearness = 12.0; |
883 |
|
|
884 |
|
/* Limit sky brightness */ |
885 |
< |
if (sky_brightness < 0.05) |
885 |
> |
if (sky_brightness < 0.01) |
886 |
|
sky_brightness = 0.01; |
887 |
|
} |
888 |
|
|
968 |
|
double rh_illum = 0.0; /* Relative horizontal illuminance */ |
969 |
|
|
970 |
|
for (i = 1; i < nskypatch; i++) |
971 |
< |
rh_illum += parr[3*i+1] * rh_cos(i); |
971 |
> |
rh_illum += parr[3*i+1] * rh_cos(i) * rh_dom[i]; |
972 |
|
|
973 |
< |
return rh_illum * (2.0 * PI / (nskypatch-1)); |
973 |
> |
return rh_illum; |
974 |
|
} |
975 |
|
|
976 |
|
/* Calculate earth orbit eccentricity correction factor */ |