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Comparing ray/src/gen/gendaylit.c (file contents):
Revision 2.11 by greg, Tue Apr 30 17:05:27 2013 UTC vs.
Revision 2.12 by greg, Fri Aug 9 16:44:19 2013 UTC

# Line 1 | Line 1
1 – #ifndef lint
2 – static const char RCSid[] = "$Id$";
3 – #endif
1   /*      Copyright (c) 1994,2006 *Fraunhofer Institut for Solar Energy Systems
2   *                              Heidenhofstr. 2, D-79110 Freiburg, Germany
3   *                              *Agence de l'Environnement et de la Maitrise de l'Energie
4   *                              Centre de Valbonne, 500 route des Lucioles, 06565 Sophia Antipolis Cedex, France
5   *                              *BOUYGUES
6   *                              1 Avenue Eugene Freyssinet, Saint-Quentin-Yvelines, France
10 – *
11 – *      24.1.2006                some adjustments for cygwin compilation, inclusion of RADIANCE3.7 libraries, by J. Wienold
12 – *               2011/10/08      [email protected]:
13 – *                                               - integrated coeff_perez.dat and defangles.dat
14 – *                                               - avoid some segfaults caused by out of range parameters and
15 – *                                               - numerically dangerous range checks
7   */
8  
18 – /*
19 – *  gendaylit.c         program to generate the angular distribution of the daylight.
20 – *                      Our zenith is along the Z-axis, the X-axis
21 – *                      points east, and the Y-axis points north.
22 – */
23 –
24 – #define _USE_MATH_DEFINES
25 –
9   #include  <stdio.h>
10   #include  <string.h>
11   #include  <math.h>
12   #include  <stdlib.h>
13  
14   #include  "color.h"
15 + #include  "sun.h"
16   #include  "paths.h"
17  
18   #define  DOT(v1,v2)     (v1[0]*v2[0]+v1[1]*v2[1]+v1[2]*v2[2])
# Line 38 | Line 22 | double  normsc();
22   /*static        char *rcsid="$Header$";*/
23  
24   float coeff_perez[] = {
25 <        1.3525,-0.2576,-0.2690,-1.4366,-0.7670,0.0007,1.2734,-0.1233,2.8000,0.6004,1.2375,1.000,1.8734,0.6297,0.9738,0.2809,0.0356,-0.1246,-0.5718,0.9938,
26 <        -1.2219,-0.7730,1.4148,1.1016,-0.2054,0.0367,-3.9128,0.9156,6.9750,0.1774,6.4477,-0.1239,-1.5798,-0.5081,-1.7812,0.1080,0.2624,0.0672,-0.2190,-0.4285,
27 <        -1.1000,-0.2515,0.8952,0.0156,0.2782,-0.1812,-4.5000,1.1766,24.7219,-13.0812,-37.7000,34.8438,-5.0000,1.5218,3.9229,-2.6204,-0.0156,0.1597,0.4199,-0.5562,
28 <        -0.5484,-0.6654,-0.2672,0.7117,0.7234,-0.6219,-5.6812,2.6297,33.3389,-18.3000,-62.2500,52.0781,-3.5000,0.0016,1.1477,0.1062,0.4659,-0.3296,-0.0876,-0.0329,
29 <        -0.6000,-0.3566,-2.5000,2.3250,0.2937,0.0496,-5.6812,1.8415,21.0000,-4.7656,-21.5906,7.2492,-3.5000,-0.1554,1.4062,0.3988,0.0032,0.0766,-0.0656,-0.1294,
30 <        -1.0156,-0.3670,1.0078,1.4051,0.2875,-0.5328,-3.8500,3.3750,14.0000,-0.9999,-7.1406,7.5469,-3.4000,-0.1078,-1.0750,1.5702,-0.0672,0.4016,0.3017,-0.4844,
31 <        -1.0000,0.0211,0.5025,-0.5119,-0.3000,0.1922,0.7023,-1.6317,19.0000,-5.0000,1.2438,-1.9094,-4.0000,0.0250,0.3844,0.2656,1.0468,-0.3788,-2.4517,1.4656,
32 <        -1.0500,0.0289,0.4260,0.3590,-0.3250,0.1156,0.7781,0.0025,31.0625,-14.5000,-46.1148,55.3750,-7.2312,0.4050,13.3500,0.6234,1.5000,-0.6426,1.8564,0.5636};
25 >        1.3525,-0.2576,-0.2690,-1.4366,-0.7670,0.0007,1.2734,-0.1233,2.8000,0.6004,1.2375,1.000,1.8734,0.6297,
26 >        0.9738,0.2809,0.0356,-0.1246,-0.5718,0.9938,-1.2219,-0.7730,1.4148,1.1016,-0.2054,0.0367,-3.9128,0.9156,
27 >        6.9750,0.1774,6.4477,-0.1239,-1.5798,-0.5081,-1.7812,0.1080,0.2624,0.0672,-0.2190,-0.4285,-1.1000,-0.2515,
28 >        0.8952,0.0156,0.2782,-0.1812,-4.5000,1.1766,24.7219,-13.0812,-37.7000,34.8438,-5.0000,1.5218,3.9229,
29 >        -2.6204,-0.0156,0.1597,0.4199,-0.5562,-0.5484,-0.6654,-0.2672,0.7117,0.7234,-0.6219,-5.6812,2.6297,
30 >        33.3389,-18.3000,-62.2500,52.0781,-3.5000,0.0016,1.1477,0.1062,0.4659,-0.3296,-0.0876,-0.0329,-0.6000,
31 >        -0.3566,-2.5000,2.3250,0.2937,0.0496,-5.6812,1.8415,21.0000,-4.7656,-21.5906,7.2492,-3.5000,-0.1554,
32 >        1.4062,0.3988,0.0032,0.0766,-0.0656,-0.1294,-1.0156,-0.3670,1.0078,1.4051,0.2875,-0.5328,-3.8500,3.3750,
33 >        14.0000,-0.9999,-7.1406,7.5469,-3.4000,-0.1078,-1.0750,1.5702,-0.0672,0.4016,0.3017,-0.4844,-1.0000,
34 >        0.0211,0.5025,-0.5119,-0.3000,0.1922,0.7023,-1.6317,19.0000,-5.0000,1.2438,-1.9094,-4.0000,0.0250,0.3844,
35 >        0.2656,1.0468,-0.3788,-2.4517,1.4656,-1.0500,0.0289,0.4260,0.3590,-0.3250,0.1156,0.7781,0.0025,31.0625,
36 >        -14.5000,-46.1148,55.3750,-7.2312,0.4050,13.3500,0.6234,1.5000,-0.6426,1.8564,0.5636};
37  
38  
39 < float defangle_theta[] = {84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 12, 12, 12, 12, 12, 12, 0};
39 > float defangle_theta[] = {
40 >        84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84,
41 >        84, 84, 84, 84, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72,
42 >        72, 72, 72, 72, 72, 72, 72, 72, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60,
43 >        60, 60, 60, 60, 60, 60, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
44 >        48, 48, 48, 48, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 24, 24, 24, 24,
45 >        24, 24, 24, 24, 24, 24, 24, 24, 12, 12, 12, 12, 12, 12, 0};
46  
47 < float defangle_phi[] = {0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240, 252, 264, 276, 288, 300, 312, 324, 336, 348, 0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240, 252, 264, 276, 288, 300, 312, 324, 336, 348, 0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 60, 120, 180, 240, 300, 0};
47 > float defangle_phi[] = {
48 >        0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240, 252, 264,
49 >        276, 288, 300, 312, 324, 336, 348, 0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180,
50 >        192, 204, 216, 228, 240, 252, 264, 276, 288, 300, 312, 324, 336, 348, 0, 15, 30, 45, 60, 75, 90, 105,
51 >        120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 0, 15, 30, 45, 60, 75,
52 >        90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 0, 20, 40, 60,
53 >        80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 0, 30, 60, 90, 120, 150, 180, 210,
54 >        240, 270, 300, 330, 0, 60, 120, 180, 240, 300, 0};
55  
56  
57  
# Line 62 | Line 63 | double sky_clearness();
63   double  diffuse_irradiance_from_sky_brightness();
64   double  direct_irradiance_from_sky_clearness();
65  
66 + /* Perez global horizontal, diffuse horizontal and direct normal luminous efficacy models : */
67 + /* input w(cm)=2cm, solar zenith angle(degrees); output efficacy(lm/W) */
68  
66 – /* Perez global horizontal, diffuse horizontal and direct normal luminous efficacy models : input w(cm)=2cm, solar zenith angle(degrees); output efficacy(lm/W) */
69   double  glob_h_effi_PEREZ();
70   double  glob_h_diffuse_effi_PEREZ();
71   double  direct_n_effi_PEREZ();
72 +
73   /*likelihood check of the epsilon, delta, direct and diffuse components*/
74   void    check_parametrization();
75   void    check_irradiances();
# Line 74 | Line 77 | void   check_illuminances();
77   void    illu_to_irra_index();
78   void    print_error_sky();
79  
80 <
78 < /* Perez sky luminance model */
79 < double  calc_rel_lum_perez(double dzeta,double gamma,double Z,
80 <                double epsilon,double Delta,float coeff_perez[]);
81 < /* coefficients for the sky luminance perez model */
80 > double  calc_rel_lum_perez(double dzeta,double gamma,double Z,double epsilon,double Delta,float coeff_perez[]);
81   void    coeff_lum_perez(double Z, double epsilon, double Delta, float coeff_perez[]);
82   double  radians(double degres);
83   double  degres(double radians);
# Line 86 | Line 85 | void   theta_phi_to_dzeta_gamma(double theta,double phi,
85   double  integ_lv(float *lv,float *theta);
86  
87   void printdefaults();
88 + void check_sun_position();
89   void computesky();
90   void printhead(int ac, char** av);
91   void userror(char* msg);
# Line 97 | Line 97 | FILE * frlibopen(char* fname);
97   double  get_eccentricity();
98   double  air_mass();
99  
100 < extern int jdate(int month, int day);
101 < extern double stadj(int  jd);
102 < extern double sdec(int  jd);
103 < extern double salt(double sd, double st);
104 < extern double sazi(double sd, double st);
100 > double  solar_sunset();
101 > double  solar_sunrise();
102 > double  stadj();
103 > int     jdate(int month, int day);
104  
105  
106 +
107   /* sun calculation constants */
108 < extern double  s_latitude;
109 < extern double  s_longitude;
110 < extern double  s_meridian;
108 > extern double   s_latitude;
109 > extern double   s_longitude;
110 > extern double   s_meridian;
111  
112   const double    AU = 149597890E3;
113   const double    solar_constant_e = 1367;    /* solar constant W/m^2 */
# Line 116 | Line 116 | const double   solar_constant_l = 127.5;   /* solar co
116   const double    half_sun_angle = 0.2665;
117   const double    half_direct_angle = 2.85;
118  
119 < const double    skyclearinf = 1.000;    /* limitations for the variation of the Perez parameters */
119 > const double    skyclearinf = 1.0;      /* limitations for the variation of the Perez parameters */
120   const double    skyclearsup = 12.1;
121   const double    skybriginf = 0.01;
122   const double    skybrigsup = 0.6;
# Line 134 | Line 134 | double  altitude, azimuth;                     /* or solar angles */
134   /* definition of the sky conditions through the Perez parametrization */
135   double  skyclearness = 0;
136   double  skybrightness = 0;
137 < double  solarradiance;  /*radiance of the sun disk and of the circumsolar area*/
138 < double  diffuseilluminance, directilluminance, diffuseirradiance, directirradiance;
139 < double  sunzenith, daynumber=150, atm_preci_water=2;
137 > double  solarradiance;
138 > double  diffuseilluminance, directilluminance, diffuseirradiance, directirradiance, globalirradiance;
139 > double  sunzenith, daynumber, atm_preci_water=2;
140  
141 < double sunaltitude_border = 0;
141 > /*double  sunaltitude_border = 0;*/
142   double  diffnormalization = 0;
143 < double dirnormalization = 0;
143 > double  dirnormalization = 0;
144   double  *c_perez;
145  
146 < int     output=0;       /*define the unit of the output (sky luminance or radiance): visible watt=0, solar watt=1, lumen=2*/
147 < int     input=0;        /*define the input for the calulation*/
146 > int     output=0;       /* define the unit of the output (sky luminance or radiance): */
147 >                        /* visible watt=0, solar watt=1, lumen=2 */
148 > int     input=0;        /* define the input for the calulation */
149  
150   int     suppress_warnings=0;
151  
152          /* default values */
153 < int  cloudy = 0;                                /* 1=standard, 2=uniform */
154 < int  dosun = 1;
153 > int     cloudy = 0;                             /* 1=standard, 2=uniform */
154 > int     dosun = 1;
155   double  zenithbr = -1.0;
156   double  betaturbidity = 0.1;
157   double  gprefl = 0.2;
# Line 162 | Line 163 | double  groundbr = 0;
163   double  F2;
164   double  solarbr = 0.0;
165   int     u_solar = 0;                            /* -1=irradiance, 1=radiance */
166 + float   timeinterval = 0;
167  
168 < char  *progname;
169 < char  errmsg[128];
168 > char    *progname;
169 > char    errmsg[128];
170  
171  
172 +
173 +
174   int main(int argc, char** argv)
175   {
176          int  i;
# Line 201 | Line 205 | int main(int argc, char** argv)
205                                  cloudy = 0;
206                                  dosun = argv[i][0] == '+';
207                                  break;
204 –                        case 'r':
208                          case 'R':
209                                  u_solar = argv[i][1] == 'R' ? -1 : 1;
210                                  solarbr = atof(argv[++i]);
# Line 233 | Line 236 | int main(int argc, char** argv)
236                                  break;
237                          
238                          case 'O':
239 <                                output = atoi(argv[++i]);       /*define the unit of the output of the program :
239 >                                output = atof(argv[++i]);       /*define the unit of the output of the program :
240                                                                  sky and sun luminance/radiance (0==W visible, 1==W solar radiation, 2==lm) */
241                                  break;
242                                  
# Line 261 | Line 264 | int main(int argc, char** argv)
264                                  diffuseirradiance = atof(argv[++i]);
265                                  break;
266                          
267 <                        case 'l':
267 >                        case 'E':                                       /* Erbs model based on the */
268 >                                input = 4;                              /* global-horizontal irradiance [W/m^2] */
269 >                                globalirradiance = atof(argv[++i]);
270 >                                break;
271 >                        
272 >                        /*
273 >                        case 'l':
274                                  sunaltitude_border = atof(argv[++i]);
275                                  break;
276 +                        */
277 +                                
278 +                        case 'i':
279 +                                timeinterval = atof(argv[++i]);
280 +                                break;
281                          
282                          
283                          default:
# Line 279 | Line 293 | int main(int argc, char** argv)
293                      progname, (s_longitude-s_meridian)*12/M_PI);
294  
295  
296 <        /* allocation dynamique de memoire pour les pointeurs */
296 >        /* dynamic memory allocation for the pointers */
297 >        
298          if ( (c_perez = calloc(5, sizeof(double))) == NULL )
299          {
300 <                fprintf(stderr,"Out of memory error in function main !");
300 >                fprintf(stderr,"Out of memory error in function main");
301                  return 1;
302          }
303  
304          printhead(argc, argv);
290 –
305          computesky();
306 +        
307 +        if(*(c_perez+1)>0)
308 +        {
309 +          fprintf(stderr, "Warning: positive Perez parameter B (= %lf), printing error sky\n",*(c_perez+1));      
310 +          print_error_sky();
311 +          exit(1);
312 +        }
313 +        
314          printsky();
293 –
315          return 0;
316   }
317  
318  
319 < void computesky()                       /* compute sky parameters */
319 >
320 >
321 >
322 >
323 >
324 >
325 > void computesky()
326   {
327  
301 –        /* new variables */
328          int     j;
329 <        float   *lv_mod;  /* 145 luminance values*/
330 <          /* 145 directions for the calculation of the normalization coefficient, coefficient Perez model */
329 >        
330 >        float   *lv_mod;  /* 145 luminance values */
331          float   *theta_o, *phi_o;
332          double  dzeta, gamma;
333          double  normfactor;
334 +        double  erbs_s0, erbs_kt;
335  
336  
310 –
337          /* compute solar direction */
338 <
338 >                
339          if (month) {                    /* from date and time */
340                  int  jd;
341                  double  sd, st;
# Line 320 | Line 346 | void computesky()                      /* compute sky parameters */
346                          st = hour;
347                  else
348                          st = hour + stadj(jd);
349 +                                
350 +                
351 +                if(st<solar_sunrise(month,day) || st>solar_sunset(month,day)) {
352 +                print_error_sky();
353 +                exit(1);
354 +                }
355 +                
356 +                                        
357 +                if(timeinterval) {
358 +                        
359 +                        if(timeinterval<0) {
360 +                        fprintf(stderr, "time interval negative\n");
361 +                        exit(1);
362 +                        }
363 +                                        
364 +                        if(fabs(solar_sunrise(month,day)-st)<timeinterval/60) {                
365 +                        
366 +                        fprintf(stderr, "Solar position corrected at %d %d %.3f\n",month,day,hour);
367 +                        st= (st+timeinterval/120+solar_sunrise(month,day))/2;
368 +                        }
369 +                
370 +                        if(fabs(solar_sunset(month,day)-st)<timeinterval/60) {
371 +                        fprintf(stderr, "Solar position corrected at %d %d %.3f\n",month,day,hour);
372 +                        st= (st-timeinterval/120+solar_sunset(month,day))/2;
373 +                        }
374 +                }
375 +                
376 +                
377                  altitude = salt(sd, st);
378                  azimuth = sazi(sd, st);
379                  
380                  daynumber = (double)jdate(month, day);
381 <
381 >                
382          }
383          
384          
385 <        
386 <        
387 <        
388 <        /* if loop for the -l option. 01/2013 Sprenger  */
335 <        
385 >
386 >
387 >        /* if loop for the -l option. W.Sprenger (01/2013) */
388 >        /*
389          if (altitude*180/M_PI < sunaltitude_border) {
390          
391 <        if (suppress_warnings==0)
392 <            fprintf(stderr, "Warning: sun altitude (%.3f degrees) below the border (%.3f degrees)\n",altitude*180/M_PI,sunaltitude_border);
391 >        if (suppress_warnings==0) {
392 >            fprintf(stderr, "Warning: sun altitude (%.3f degrees) below the border (%.3f degrees)\n",altitude*180/M_PI,sunaltitude_border);
393 >                                   }
394          print_error_sky();
395 <        exit(0);
395 >        exit(1);
396          }
397 <        
398 <        
397 >        */
398 >
399                          
346 –        
347 –                        
400          if (!cloudy && altitude > 87.*M_PI/180.) {
401                  
402                  if (suppress_warnings==0) {
# Line 366 | Line 418 | void computesky()                      /* compute sky parameters */
418          
419  
420          /* compute the inputs for the calculation of the light distribution over the sky*/
421 <        if (input==0)
421 >        if (input==0)           /* P */
422                  {
423                  check_parametrization();
424                  diffuseirradiance = diffuse_irradiance_from_sky_brightness(); /*diffuse horizontal irradiance*/
# Line 382 | Line 434 | void computesky()                      /* compute sky parameters */
434                  }
435          
436  
437 <        else if (input==1)
437 >        else if (input==1)      /* W */
438                  {
439                  check_irradiances();
440                  skybrightness = sky_brightness();
# Line 399 | Line 451 | void computesky()                      /* compute sky parameters */
451                  }
452                          
453          
454 <        else if (input==2)
454 >        else if (input==2)      /* L */
455                  {              
456                  check_illuminances();
457                  illu_to_irra_index();
# Line 407 | Line 459 | void computesky()                      /* compute sky parameters */
459                  }
460                  
461  
462 <        else if (input==3)
462 >        else if (input==3)      /* G */
463                  {
464                          if (altitude<=0)
465                          {
# Line 416 | Line 468 | void computesky()                      /* compute sky parameters */
468                                  directirradiance = 0;
469                                  diffuseirradiance = 0;
470                          } else {
471 <                                directirradiance=directirradiance/sin(altitude);
471 >                        
472 >                                directirradiance=directirradiance/sin(altitude);
473                          }
474 +                                
475                  check_irradiances();
476                  skybrightness = sky_brightness();
477                  skyclearness =  sky_clearness();
# Line 432 | Line 486 | void computesky()                      /* compute sky parameters */
486  
487                  }
488  
489 +
490 +        else if (input==4)      /* E */         /* Implementation of the Erbs model. W.Sprenger (04/13) */
491 +                {
492 +                        
493 +                        if (altitude<=0)
494 +                        {
495 +                                if (suppress_warnings==0 && globalirradiance > 50)
496 +                                        fprintf(stderr, "Warning: global irradiance higher than 50 W/m^2 while the sun altitude is lower than zero\n");
497 +                                globalirradiance = 0; diffuseirradiance = 0; directirradiance = 0;
498 +                        
499 +                        } else {
500 +                        
501 +                        erbs_s0 = solar_constant_e*get_eccentricity()*sin(altitude);
502 +                        
503 +                        if (globalirradiance>erbs_s0)
504 +                        {
505 +                                if (suppress_warnings==0)
506 +                                        fprintf(stderr, "Warning: global irradiance is higher than the time-dependent solar constant s0\n");
507 +                                
508 +                                globalirradiance=erbs_s0*0.999;                
509 +                        }
510 +                        
511 +                        erbs_kt=globalirradiance/erbs_s0;
512 +                        
513 +                        if (erbs_kt<=0.22)      diffuseirradiance=globalirradiance*(1-0.09*erbs_kt);
514 +                        else if (erbs_kt<=0.8)  diffuseirradiance=globalirradiance*(0.9511-0.1604*erbs_kt+4.388*pow(erbs_kt,2)-16.638*pow(erbs_kt,3)+12.336*pow(erbs_kt,4));
515 +                        else if (erbs_kt<1)     diffuseirradiance=globalirradiance*(0.165);
516 +                        
517 +                        directirradiance=globalirradiance-diffuseirradiance;
518 +                        
519 +                        printf("# erbs_s0, erbs_kt, irr_dir_h, irr_diff: %.3f %.3f %.3f %.3f\n", erbs_s0, erbs_kt, directirradiance, diffuseirradiance);
520 +                        printf("# WARNING: the -E option is only recommended for a rough estimation!");
521 +                        
522 +                        directirradiance=directirradiance/sin(altitude);
523 +                                                                                                                        
524 +                        }
525 +                        
526 +                check_irradiances();
527 +                skybrightness = sky_brightness();
528 +                skyclearness =  sky_clearness();
529 +                check_parametrization();
530 +
531 +                if (output==0 || output==2)
532 +                        {
533 +                        diffuseilluminance = diffuseirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/
534 +                        directilluminance = directirradiance*direct_n_effi_PEREZ();
535 +                        check_illuminances();
536 +                        }
537 +
538 +                }
539 +                
540 +                
541 +                
542          
543 <        else    {fprintf(stderr,"error in giving the input arguments"); exit(1);}
543 >        else    {fprintf(stderr,"error at the input arguments"); exit(1);}
544  
545  
546          
547          /* normalization factor for the relative sky luminance distribution, diffuse part*/
548 <
548 >        
549          if ( (lv_mod = malloc(145*sizeof(float))) == NULL)
550          {
551                  fprintf(stderr,"Out of memory in function main");
# Line 448 | Line 555 | void computesky()                      /* compute sky parameters */
555          /* read the angles */
556          theta_o = defangle_theta;
557          phi_o = defangle_phi;
558 +        
559  
560          /* parameters for the perez model */
561          coeff_lum_perez(radians(sunzenith), skyclearness, skybrightness, coeff_perez);
562  
563 +        
564 +        
565 +        
566 +        
567          /*calculation of the modelled luminance */
568          for (j=0;j<145;j++)
569          {
570                  theta_phi_to_dzeta_gamma(radians(*(theta_o+j)),radians(*(phi_o+j)),&dzeta,&gamma,radians(sunzenith));
571 +                                
572                  *(lv_mod+j) = calc_rel_lum_perez(dzeta,gamma,radians(sunzenith),skyclearness,skybrightness,coeff_perez);
573 <                // printf("theta, phi, lv_mod %f\t %f\t %f\n", *(theta_o+j),*(phi_o+j),*(lv_mod+j));
573 >                
574 >                /* fprintf(stderr,"theta, phi, lv_mod %f\t %f\t %f\n", *(theta_o+j),*(phi_o+j),*(lv_mod+j)); */
575          }
576 <
576 >        
577          /* integration of luminance for the normalization factor, diffuse part of the sky*/
578 +        
579          diffnormalization = integ_lv(lv_mod, theta_o);
465 –        /*printf("perez integration %lf\n", diffnormalization);*/
580          
467 –        
581  
582  
583          /*normalization coefficient in lumen or in watt*/
# Line 548 | Line 661 | void print_error_sky()
661          
662  
663  
664 +
665 +
666 +
667 +
668 + double solar_sunset(int month,int day)
669 + {
670 +     float W;
671 +     extern double s_latitude;
672 +     W=-1*(tan(s_latitude)*tan(sdec(jdate(month, day))));
673 +     return(12+(M_PI/2 - atan2(W,sqrt(1-W*W)))*180/(M_PI*15));
674 + }
675 +
676 +
677 + double solar_sunrise(int month,int day)
678 + {
679 +     float W;
680 +     extern double s_latitude;
681 +     W=-1*(tan(s_latitude)*tan(sdec(jdate(month, day))));
682 +     return(12-(M_PI/2 - atan2(W,sqrt(1-W*W)))*180/(M_PI*15));
683 + }
684 +
685 +
686 +
687 +
688 +
689 +
690 +
691 +
692 +
693 +
694 +
695   void printsky()                 /* print out sky */
696   {
697          if (dosun&&(skyclearness>1))
# Line 567 | Line 711 | void printsky()                        /* print out sky */
711                  printf("4 %f %f %f %f\n", sundir[0], sundir[1], sundir[2], 2*half_sun_angle);
712          }
713          
714 +
715          printf("\nvoid brightfunc skyfunc\n");
716          printf("2 skybright perezlum.cal\n");
717          printf("0\n");
718          printf("10 %.3e %.3e %lf %lf %lf %lf %lf %f %f %f \n", diffnormalization, groundbr,
719                  *(c_perez+0),*(c_perez+1),*(c_perez+2),*(c_perez+3),*(c_perez+4),
720                  sundir[0], sundir[1], sundir[2]);
721 +        
722   }
723  
724  
# Line 592 | Line 738 | void printdefaults()                   /* print default values */
738   void userror(char* msg)                 /* print usage error and quit */
739   {
740          if (msg != NULL)
741 <                fprintf(stderr, "%s: Use error - %s\n", progname, msg);
742 <        fprintf(stderr, "Usage: %s month day hour [-P|-W|-L|-G] direct_value diffuse_value [options]\n", progname);
743 <        fprintf(stderr, "or:    %s -ang altitude azimuth [-P|-W|-L|-G] direct_value diffuse_value [options]\n", progname);
741 >                fprintf(stderr, "%s: Use error - %s\n\n", progname, msg);
742 >        fprintf(stderr, "Usage: %s      month day hour    [...]\n", progname);
743 >        fprintf(stderr, "   or: %s -ang altitude azimuth  [...]\n", progname);
744 >        fprintf(stderr, "               followed by:      -P          epsilon delta [options]\n");
745 >        fprintf(stderr, "                        or:      [-W|-L|-G]  direct_value diffuse_value [options]\n");
746 >        fprintf(stderr, "                        or:      -E          global_irradiance [options]\n\n");
747 >        fprintf(stderr, "       Description:\n");
748          fprintf(stderr, "       -P epsilon delta  (these are the Perez parameters) \n");
749          fprintf(stderr, "       -W direct-normal-irradiance diffuse-horizontal-irradiance (W/m^2)\n");
750          fprintf(stderr, "       -L direct-normal-illuminance diffuse-horizontal-illuminance (lux)\n");
751          fprintf(stderr, "       -G direct-horizontal-irradiance diffuse-horizontal-irradiance (W/m^2)\n");
752 +        fprintf(stderr, "       -E global-horizontal-irradiance (W/m^2)\n\n");
753 +        fprintf(stderr, "       Output specification with option:\n");
754          fprintf(stderr, "       -O [0|1|2]  (0=output in W/m^2/sr visible, 1=output in W/m^2/sr solar, 2=output in candela/m^2), default is 0 \n");
755 <        fprintf(stderr, "       gendaylit version 2.00 (2013/01/28)  \n");
755 >        fprintf(stderr, "       gendaylit version 2.3 (2013/08/08)  \n\n");
756          exit(1);
757   }
758  
# Line 642 | Line 794 | void printhead(int ac, char** av)              /* print command he
794  
795  
796  
645 –
646 –
797   /* Perez models */
798  
799   /* Perez global horizontal luminous efficacy model */
# Line 653 | Line 803 | double glob_h_effi_PEREZ()
803          double  value;
804          double  category_bounds[10], a[10], b[10], c[10], d[10];
805          int     category_total_number, category_number, i;
806 <
807 <
808 < if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0)
809 <     fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_effi_PEREZ \n");
810 <
806 >        
807 >        check_parametrization();
808 >        
809 >        
810 > /*if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0)
811 >     fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_effi_PEREZ \n"); */
812 >    
813 >    
814          /* initialize category bounds (clearness index bounds) */
815  
816          category_total_number = 8;
# Line 733 | Line 886 | double glob_h_diffuse_effi_PEREZ()
886          double  category_bounds[10], a[10], b[10], c[10], d[10];
887          int     category_total_number, category_number, i;
888  
889 +
890 +
891          
892 < if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0)
893 <     fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_diffuse_effi_PEREZ \n");
892 >        check_parametrization();
893 >        
894 >        
895 > /*if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0)
896 >     fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_diffuse_PEREZ \n"); */
897 >    
898 >
899  
900   /* initialize category bounds (clearness index bounds) */
901  
902          category_total_number = 8;
903  
904 < //XXX: category_bounds > 0.1
904 > //XXX:  category_bounds > 0.1
905          category_bounds[1] = 1;
906          category_bounds[2] = 1.065;
907          category_bounds[3] = 1.230;
# Line 802 | Line 962 | if ((skyclearness<skyclearinf || skyclearness>skyclear
962  
963          if (category_number == -1) {
964                  if (suppress_warnings==0)
965 <                    fprintf(stderr, "ERROR: Model parameters out of range\n");
965 >                    fprintf(stderr, "ERROR: Model parameters out of range, skyclearness = %lf \n", skyclearness);
966                  print_error_sky();
967                  exit(1);
968          }
# Line 812 | Line 972 | if ((skyclearness<skyclearinf || skyclearness>skyclear
972              d[category_number]*log(skybrightness);
973  
974          return(value);
975 +
976   }
977  
978  
979 +
980   /* direct normal efficacy model, according to PEREZ */
981  
982   double direct_n_effi_PEREZ()
# Line 905 | Line 1067 | if (skyclearness<skyclearinf || skyclearness>skyclears
1067  
1068   /*  limit sky clearness or sky brightness, 2009 11 13 by J. Wienold */
1069                  if (skyclearness<skyclearinf){
908 –                        skyclearness=skyclearinf;
1070                          if (suppress_warnings==0)
1071 <                            fprintf(stderr,"Range warning: sky clearness too low (%lf)\n", skyclearness);
1071 >                            /* fprintf(stderr,"Range warning: sky clearness too low (%lf)\n", skyclearness); */
1072 >                        skyclearness=skyclearinf;
1073                  }
1074                  if (skyclearness>skyclearsup){
913 –                        skyclearness=skyclearsup-0.1;
1075                          if (suppress_warnings==0)
1076 <                            fprintf(stderr,"Range warning: sky clearness too high (%lf)\n", skyclearness);
1076 >                            /* fprintf(stderr,"Range warning: sky clearness too high (%lf)\n", skyclearness); */
1077 >                        skyclearness=skyclearsup-0.1;
1078                  }
1079                  if (skybrightness<skybriginf){
918 –                        skybrightness=skybriginf;
1080                          if (suppress_warnings==0)
1081 <                            fprintf(stderr,"Range warning: sky brightness too low (%lf)\n", skybrightness);
1081 >                            /* fprintf(stderr,"Range warning: sky brightness too low (%lf)\n", skybrightness); */
1082 >                        skybrightness=skybriginf;
1083                  }
1084                  if (skybrightness>skybrigsup){
923 –                        skybrightness=skybrigsup;
1085                          if (suppress_warnings==0)
1086 <                            fprintf(stderr,"Range warning: sky brightness too high (%lf)\n", skybrightness);
1086 >                            /* fprintf(stderr,"Range warning: sky brightness too high (%lf)\n", skybrightness); */
1087 >                        skybrightness=skybrigsup;
1088                  }
1089  
1090          return; }
# Line 1012 | Line 1174 | double direct_irradiance_from_sky_clearness()
1174   }
1175  
1176  
1177 +
1178 +
1179   void illu_to_irra_index()
1180   {
1181   double  test1=0.1, test2=0.1, d_eff;
# Line 1022 | Line 1186 | directirradiance = directilluminance*solar_constant_e/
1186   skyclearness =  sky_clearness();
1187   skybrightness = sky_brightness();
1188   check_parametrization();
1189 <        
1189 >
1190 >
1191   while ( ((fabs(diffuseirradiance-test1)>10) || (fabs(directirradiance-test2)>10)
1192 <                || skyclearness>skyclearinf || skyclearness<skyclearsup
1193 <                || skybrightness>skybriginf || skybrightness<skybrigsup )
1194 <                 && !(counter==5) )
1192 >                || (!(skyclearness<skyclearinf || skyclearness>skyclearsup))
1193 >                || (!(skybrightness<skybriginf || skybrightness>skybrigsup)) )
1194 >                 && !(counter==9) )
1195          {
1196 <
1196 >        
1197          test1=diffuseirradiance;
1198          test2=directirradiance;
1199          counter++;
1200          
1201          diffuseirradiance = diffuseilluminance/glob_h_diffuse_effi_PEREZ();
1202          d_eff = direct_n_effi_PEREZ();
1203 +        
1204 +        
1205          if (d_eff < 0.1)
1206                  directirradiance = 0;
1207 <        else
1207 >        else    
1208                  directirradiance = directilluminance/d_eff;
1209          
1210          skybrightness = sky_brightness();
1211          skyclearness =  sky_clearness();
1212          check_parametrization();
1213          
1214 +        /*fprintf(stderr,"skyclearness = %lf, skybrightness = %lf, directirradiance = %lf, diffuseirradiance = %lf\n",skyclearness, skybrightness, directirradiance, diffuseirradiance);*/
1215 +                
1216          }
1217  
1218  
# Line 1072 | Line 1241 | static int get_numlin(float epsilon)
1241   /* sky luminance perez model */
1242   double calc_rel_lum_perez(double dzeta,double gamma,double Z,double epsilon,double Delta,float coeff_perez[])
1243   {
1244 +                        
1245          float x[5][4];
1246          int i,j,num_lin;
1247          double c_perez[5];
# Line 1087 | Line 1257 | double calc_rel_lum_perez(double dzeta,double gamma,do
1257          {
1258                  if ( Delta < 0.2 ) Delta = 0.2;
1259          }
1260 <
1260 >        
1261 >        
1262          num_lin = get_numlin(epsilon);
1263 <
1263 >        
1264          for (i=0;i<5;i++)
1265                  for (j=0;j<4;j++)
1266                  {
1267                          x[i][j] = *(coeff_perez + 20*num_lin + 4*i +j);
1268 <                        /* printf("x %d %d vaut %f\n",i,j,x[i][j]); */
1268 >                        /* fprintf(stderr,"x %d %d vaut %f\n",i,j,x[i][j]); */
1269                  }
1270  
1271  
# Line 1137 | Line 1308 | void coeff_lum_perez(double Z, double epsilon, double
1308          {
1309                  if ( Delta < 0.2 ) Delta = 0.2;
1310          }
1311 <
1311 >        
1312 >        
1313          num_lin = get_numlin(epsilon);
1314  
1315 <        //fprintf(stderr,"numlin %d\n", num_lin);
1315 >        /*fprintf(stderr,"numlin %d\n", num_lin);*/
1316  
1317          for (i=0;i<5;i++)
1318                  for (j=0;j<4;j++)
# Line 1172 | Line 1344 | void coeff_lum_perez(double Z, double epsilon, double
1344   }
1345  
1346  
1347 +
1348   /* degrees into radians */
1349   double radians(double degres)
1350   {
1351          return degres*M_PI/180.0;
1352   }
1353  
1354 +
1355   /* radian into degrees */
1356   double degres(double radians)
1357   {
1358          return radians/M_PI*180.0;
1359   }
1360  
1361 +
1362   /* calculation of the angles dzeta and gamma */
1363   void theta_phi_to_dzeta_gamma(double theta,double phi,double *dzeta,double *gamma, double Z)
1364   {
# Line 1201 | Line 1376 | void theta_phi_to_dzeta_gamma(double theta,double phi,
1376  
1377  
1378  
1204 – /********************************************************************************/
1205 – /*      Fonction: integ_lv                                                      */
1206 – /*                                                                              */
1207 – /*      In: float *lv,*theta                                                    */
1208 – /*          int sun_pos                                                         */
1209 – /*                                                                              */
1210 – /*      Out: double                                                             */
1211 – /*                                                                              */
1212 – /*      Update: 29/08/93                                                        */
1213 – /*                                                                              */
1214 – /*      Rem:                                                                    */
1215 – /*                                                                              */
1216 – /*      But: calcul l'integrale de luminance relative sans la dir. du soleil    */
1217 – /*                                                                              */
1218 – /********************************************************************************/
1379   double integ_lv(float *lv,float *theta)
1380   {
1381          int i;
1382          double buffer=0.0;
1383 <
1383 >        
1384          for (i=0;i<145;i++)
1385 +        {
1386                  buffer += (*(lv+i))*cos(radians(*(theta+i)));
1387 <
1387 >        }
1388 >                        
1389          return buffer*2*M_PI/144;
1228 –
1390   }
1391  
1392  
1393  
1233 –
1234 –
1235 –
1394   /* enter day number(double), return E0 = square(R0/R):  eccentricity correction factor  */
1395  
1396   double get_eccentricity()
# Line 1245 | Line 1403 | double get_eccentricity()
1403              0.000719*cos(2*day_angle)+0.000077*sin(2*day_angle);
1404  
1405          return (E0);
1248 –
1406   }
1407  
1408  
# Line 1253 | Line 1410 | double get_eccentricity()
1410   double  air_mass()
1411   {
1412   double  m;
1256 –
1413   if (sunzenith>90)
1414          {
1415          fprintf(stderr, "Solar zenith angle larger than 90 degrees in function air_mass()\n");
1416          exit(1);
1417          }
1262 –        
1418   m = 1/( cos(sunzenith*M_PI/180)+0.15*exp( log(93.885-sunzenith)*(-1.253) ) );
1419   return(m);
1420   }

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