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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* Copyright (c) 1994,2006 *Fraunhofer Institut for Solar Energy Systems |
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* Heidenhofstr. 2, D-79110 Freiburg, Germany |
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* *Agence de l'Environnement et de la Maitrise de l'Energie |
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* Centre de Valbonne, 500 route des Lucioles, 06565 Sophia Antipolis Cedex, France |
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* *BOUYGUES |
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* 1 Avenue Eugene Freyssinet, Saint-Quentin-Yvelines, France |
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* |
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* 24.1.2006 some adjustments for cygwin compilation, inclusion of RADIANCE3.7 libraries, by J. Wienold |
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* 2011/10/08 [email protected]: |
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* - integrated coeff_perez.dat and defangles.dat |
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* - avoid some segfaults caused by out of range parameters and |
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* - numerically dangerous range checks |
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* print colored output if activated in command line (-C). Based on model from A. Diakite, TU-Berlin. Implemented by J. Wienold, August 26 2018 |
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*/ |
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|
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/* |
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* gendaylit.c program to generate the angular distribution of the daylight. |
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* Our zenith is along the Z-axis, the X-axis |
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* points east, and the Y-axis points north. |
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*/ |
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|
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#define _USE_MATH_DEFINES |
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|
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#define _USE_MATH_DEFINES |
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#include <stdio.h> |
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#include <string.h> |
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#include <math.h> |
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#include <stdlib.h> |
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|
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#include "color.h" |
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#include "sun.h" |
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#include "paths.h" |
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|
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#define DOT(v1,v2) (v1[0]*v2[0]+v1[1]*v2[1]+v1[2]*v2[2]) |
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/*static char *rcsid="$Header$";*/ |
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|
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float coeff_perez[] = { |
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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, |
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-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, |
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-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, |
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-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, |
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-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, |
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-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, |
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-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, |
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-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}; |
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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, |
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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, |
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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, |
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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, |
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-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, |
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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, |
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-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, |
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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, |
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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, |
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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, |
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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, |
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-14.5000,-46.1148,55.3750,-7.2312,0.4050,13.3500,0.6234,1.5000,-0.6426,1.8564,0.5636}; |
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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}; |
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float defangle_theta[] = { |
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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, |
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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, |
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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, |
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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, |
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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, |
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24, 24, 24, 24, 24, 24, 24, 24, 12, 12, 12, 12, 12, 12, 0}; |
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|
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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}; |
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float defangle_phi[] = { |
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0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240, 252, 264, |
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276, 288, 300, 312, 324, 336, 348, 0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, |
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192, 204, 216, 228, 240, 252, 264, 276, 288, 300, 312, 324, 336, 348, 0, 15, 30, 45, 60, 75, 90, 105, |
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120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 0, 15, 30, 45, 60, 75, |
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90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 0, 20, 40, 60, |
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80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 0, 30, 60, 90, 120, 150, 180, 210, |
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240, 270, 300, 330, 0, 60, 120, 180, 240, 300, 0}; |
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/* default values for Berlin */ |
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float locus[] = { |
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-4.843e9,2.5568e6,0.24282e3,0.23258,-4.843e9,2.5568e6,0.24282e3,0.23258,-1.2848,1.7519,-0.093786}; |
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|
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/* Perez sky parametrization : epsilon and delta calculations from the direct and diffuse irradiances */ |
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/* Perez sky parametrization: epsilon and delta calculations from the direct and diffuse irradiances */ |
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double sky_brightness(); |
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double sky_clearness(); |
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|
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double diffuse_irradiance_from_sky_brightness(); |
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double direct_irradiance_from_sky_clearness(); |
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|
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/* Perez global horizontal, diffuse horizontal and direct normal luminous efficacy models : */ |
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/* input w(cm)=2cm, solar zenith angle(degrees); output efficacy(lm/W) */ |
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|
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/* Perez global horizontal, diffuse horizontal and direct normal luminous efficacy models : input w(cm)=2cm, solar zenith angle(degrees); output efficacy(lm/W) */ |
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double glob_h_effi_PEREZ(); |
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double glob_h_diffuse_effi_PEREZ(); |
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double direct_n_effi_PEREZ(); |
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|
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/*likelihood check of the epsilon, delta, direct and diffuse components*/ |
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void check_parametrization(); |
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void check_irradiances(); |
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void illu_to_irra_index(); |
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void print_error_sky(); |
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|
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|
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/* Perez sky luminance model */ |
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double calc_rel_lum_perez(double dzeta,double gamma,double Z, |
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double epsilon,double Delta,float coeff_perez[]); |
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/* coefficients for the sky luminance perez model */ |
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double calc_rel_lum_perez(double dzeta,double gamma,double Z,double epsilon,double Delta,float coeff_perez[]); |
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void coeff_lum_perez(double Z, double epsilon, double Delta, float coeff_perez[]); |
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double radians(double degres); |
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double degres(double radians); |
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double integ_lv(float *lv,float *theta); |
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|
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void printdefaults(); |
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void check_sun_position(); |
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void computesky(); |
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void printhead(int ac, char** av); |
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void userror(char* msg); |
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void usage_error(char* msg); |
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void printsky(); |
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|
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FILE * frlibopen(char* fname); |
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double get_eccentricity(); |
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double air_mass(); |
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|
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extern int jdate(int month, int day); |
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< |
extern double stadj(int jd); |
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< |
extern double sdec(int jd); |
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< |
extern double salt(double sd, double st); |
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< |
extern double sazi(double sd, double st); |
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> |
double solar_sunset(int month, int day); |
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> |
double solar_sunrise(int month, int day); |
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|
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|
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/* sun calculation constants */ |
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extern double s_latitude; |
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extern double s_longitude; |
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extern double s_meridian; |
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|
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const double AU = 149597890E3; |
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const double solar_constant_e = 1367; /* solar constant W/m^2 */ |
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< |
const double solar_constant_l = 127.5; /* solar constant klux */ |
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> |
const double solar_constant_l = 127500; /* solar constant lux */ |
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|
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const double half_sun_angle = 0.2665; |
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const double half_direct_angle = 2.85; |
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|
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< |
const double skyclearinf = 1.000; /* limitations for the variation of the Perez parameters */ |
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< |
const double skyclearsup = 12.1; |
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> |
const double skyclearinf = 1.0; /* limitations for the variation of the Perez parameters */ |
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> |
const double skyclearsup = 12.01; |
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const double skybriginf = 0.01; |
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const double skybrigsup = 0.6; |
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|
| 120 |
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|
| 121 |
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|
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/* required values */ |
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int year = 0; /* year (optional) */ |
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int month, day; /* date */ |
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double hour; /* time */ |
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int tsolar; /* 0=standard, 1=solar */ |
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/* definition of the sky conditions through the Perez parametrization */ |
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double skyclearness = 0; |
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double skybrightness = 0; |
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< |
double solarradiance; /*radiance of the sun disk and of the circumsolar area*/ |
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< |
double diffuseilluminance, directilluminance, diffuseirradiance, directirradiance; |
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< |
double sunzenith, daynumber=150, atm_preci_water=2; |
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> |
double solarradiance; |
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> |
double diffuseilluminance, directilluminance, diffuseirradiance, directirradiance, globalirradiance; |
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> |
double sunzenith, daynumber, atm_preci_water=2; |
| 137 |
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|
| 138 |
< |
double sunaltitude_border = 0; |
| 138 |
> |
/*double sunaltitude_border = 0;*/ |
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|
double diffnormalization = 0; |
| 140 |
< |
double dirnormalization = 0; |
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> |
double dirnormalization = 0; |
| 141 |
|
double *c_perez; |
| 142 |
|
|
| 143 |
< |
int output=0; /*define the unit of the output (sky luminance or radiance): visible watt=0, solar watt=1, lumen=2*/ |
| 144 |
< |
int input=0; /*define the input for the calulation*/ |
| 145 |
< |
|
| 143 |
> |
int output=0; /* define the unit of the output (sky luminance or radiance): */ |
| 144 |
> |
/* visible watt=0, solar watt=1, lumen=2 */ |
| 145 |
> |
int input=0; /* define the input for the calulation */ |
| 146 |
> |
int color_output=0; |
| 147 |
|
int suppress_warnings=0; |
| 148 |
|
|
| 149 |
|
/* default values */ |
| 150 |
< |
int cloudy = 0; /* 1=standard, 2=uniform */ |
| 151 |
< |
int dosun = 1; |
| 150 |
> |
int cloudy = 0; /* 1=standard, 2=uniform */ |
| 151 |
> |
int dosun = 1; |
| 152 |
|
double zenithbr = -1.0; |
| 153 |
|
double betaturbidity = 0.1; |
| 154 |
|
double gprefl = 0.2; |
| 155 |
|
int S_INTER=0; |
| 156 |
|
|
| 157 |
+ |
|
| 158 |
|
/* computed values */ |
| 159 |
|
double sundir[3]; |
| 160 |
|
double groundbr = 0; |
| 161 |
|
double F2; |
| 162 |
|
double solarbr = 0.0; |
| 163 |
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int u_solar = 0; /* -1=irradiance, 1=radiance */ |
| 164 |
+ |
float timeinterval = 0; |
| 165 |
|
|
| 166 |
< |
char *progname; |
| 167 |
< |
char errmsg[128]; |
| 166 |
> |
char *progname; |
| 167 |
> |
char errmsg[128]; |
| 168 |
|
|
| 169 |
+ |
double st; |
| 170 |
|
|
| 171 |
+ |
|
| 172 |
|
int main(int argc, char** argv) |
| 173 |
|
{ |
| 174 |
|
int i; |
| 179 |
|
return 0; |
| 180 |
|
} |
| 181 |
|
if (argc < 4) |
| 182 |
< |
userror("arg count"); |
| 182 |
> |
usage_error("arg count"); |
| 183 |
|
if (!strcmp(argv[1], "-ang")) { |
| 184 |
|
altitude = atof(argv[2]) * (M_PI/180); |
| 185 |
|
azimuth = atof(argv[3]) * (M_PI/180); |
| 187 |
|
} else { |
| 188 |
|
month = atoi(argv[1]); |
| 189 |
|
if (month < 1 || month > 12) |
| 190 |
< |
userror("bad month"); |
| 190 |
> |
usage_error("bad month"); |
| 191 |
|
day = atoi(argv[2]); |
| 192 |
|
if (day < 1 || day > 31) |
| 193 |
< |
userror("bad day"); |
| 193 |
> |
usage_error("bad day"); |
| 194 |
|
hour = atof(argv[3]); |
| 195 |
|
if (hour < 0 || hour >= 24) |
| 196 |
< |
userror("bad hour"); |
| 196 |
> |
usage_error("bad hour"); |
| 197 |
|
tsolar = argv[3][0] == '+'; |
| 198 |
|
} |
| 199 |
|
for (i = 4; i < argc; i++) |
| 203 |
|
cloudy = 0; |
| 204 |
|
dosun = argv[i][0] == '+'; |
| 205 |
|
break; |
| 206 |
< |
case 'r': |
| 206 |
> |
case 'y': |
| 207 |
> |
year = atoi(argv[++i]); |
| 208 |
> |
break; |
| 209 |
|
case 'R': |
| 210 |
|
u_solar = argv[i][1] == 'R' ? -1 : 1; |
| 211 |
|
solarbr = atof(argv[++i]); |
| 214 |
|
cloudy = argv[i][0] == '+' ? 2 : 1; |
| 215 |
|
dosun = 0; |
| 216 |
|
break; |
| 217 |
+ |
case 'C': |
| 218 |
+ |
if (argv[i][2] == 'I' && argv[i][3] == 'E' ) { |
| 219 |
+ |
locus[0] = -4.607e9; |
| 220 |
+ |
locus[1] = 2.9678e6; |
| 221 |
+ |
locus[2] = 0.09911e3; |
| 222 |
+ |
locus[3] = 0.244063; |
| 223 |
+ |
locus[4] = -2.0064e9; |
| 224 |
+ |
locus[5] = 1.9018e6; |
| 225 |
+ |
locus[6] = 0.24748e3; |
| 226 |
+ |
locus[7] = 0.23704; |
| 227 |
+ |
locus[8] = -3.0; |
| 228 |
+ |
locus[9] = 2.87; |
| 229 |
+ |
locus[10] = -0.275; |
| 230 |
+ |
}else{ color_output = 1; |
| 231 |
+ |
} |
| 232 |
+ |
break; |
| 233 |
+ |
case 'l': |
| 234 |
+ |
locus[0] = atof(argv[++i]); |
| 235 |
+ |
locus[1] = atof(argv[++i]); |
| 236 |
+ |
locus[2] = atof(argv[++i]); |
| 237 |
+ |
locus[3] = atof(argv[++i]); |
| 238 |
+ |
locus[4] = locus[0]; |
| 239 |
+ |
locus[5] = locus[1]; |
| 240 |
+ |
locus[6] = locus[2]; |
| 241 |
+ |
locus[7] = locus[3]; |
| 242 |
+ |
locus[8] = atof(argv[++i]); |
| 243 |
+ |
locus[9] = atof(argv[++i]); |
| 244 |
+ |
locus[10] = atof(argv[++i]); |
| 245 |
+ |
break; |
| 246 |
+ |
|
| 247 |
|
case 't': |
| 248 |
|
betaturbidity = atof(argv[++i]); |
| 249 |
|
break; |
| 267 |
|
break; |
| 268 |
|
|
| 269 |
|
case 'O': |
| 270 |
< |
output = atof(argv[++i]); /*define the unit of the output of the program : |
| 271 |
< |
sky and sun luminance/radiance (0==W visible, 1==W solar radiation, 2==lm) */ |
| 270 |
> |
output = atof(argv[++i]); /*define the unit of the output of the program: |
| 271 |
> |
sky and sun luminance/radiance |
| 272 |
> |
(0==W visible, 1==W solar radiation, 2==lm) */ |
| 273 |
|
break; |
| 274 |
|
|
| 275 |
|
case 'P': |
| 296 |
|
diffuseirradiance = atof(argv[++i]); |
| 297 |
|
break; |
| 298 |
|
|
| 299 |
< |
case 'l': |
| 300 |
< |
sunaltitude_border = atof(argv[++i]); |
| 299 |
> |
case 'E': /* Erbs model based on the */ |
| 300 |
> |
input = 4; /* global-horizontal irradiance [W/m^2] */ |
| 301 |
> |
globalirradiance = atof(argv[++i]); |
| 302 |
|
break; |
| 303 |
|
|
| 304 |
+ |
case 'i': |
| 305 |
+ |
timeinterval = atof(argv[++i]); |
| 306 |
+ |
break; |
| 307 |
|
|
| 308 |
+ |
|
| 309 |
|
default: |
| 310 |
|
sprintf(errmsg, "unknown option: %s", argv[i]); |
| 311 |
< |
userror(errmsg); |
| 311 |
> |
usage_error(errmsg); |
| 312 |
|
} |
| 313 |
|
else |
| 314 |
< |
userror("bad option"); |
| 314 |
> |
usage_error("bad option"); |
| 315 |
|
|
| 316 |
< |
if (fabs(s_meridian-s_longitude) > 30*M_PI/180) |
| 317 |
< |
fprintf(stderr, |
| 278 |
< |
"%s: warning: %.1f hours btwn. standard meridian and longitude\n", |
| 316 |
> |
if (month && !tsolar && fabs(s_meridian-s_longitude) > 45*M_PI/180) |
| 317 |
> |
fprintf(stderr,"%s: warning: %.1f hours btwn. standard meridian and longitude\n", |
| 318 |
|
progname, (s_longitude-s_meridian)*12/M_PI); |
| 319 |
|
|
| 320 |
|
|
| 321 |
< |
/* allocation dynamique de memoire pour les pointeurs */ |
| 321 |
> |
/* dynamic memory allocation for the pointers */ |
| 322 |
|
if ( (c_perez = calloc(5, sizeof(double))) == NULL ) |
| 323 |
< |
{ |
| 285 |
< |
fprintf(stderr,"Out of memory error in function main !"); |
| 286 |
< |
return 1; |
| 287 |
< |
} |
| 323 |
> |
{ fprintf(stderr,"Out of memory error in function main"); return 1; } |
| 324 |
|
|
| 325 |
+ |
|
| 326 |
|
printhead(argc, argv); |
| 290 |
– |
|
| 327 |
|
computesky(); |
| 328 |
|
printsky(); |
| 293 |
– |
|
| 329 |
|
return 0; |
| 330 |
+ |
|
| 331 |
|
} |
| 332 |
|
|
| 333 |
|
|
| 334 |
< |
void computesky() /* compute sky parameters */ |
| 334 |
> |
|
| 335 |
> |
|
| 336 |
> |
|
| 337 |
> |
void computesky() |
| 338 |
|
{ |
| 339 |
|
|
| 301 |
– |
/* new variables */ |
| 340 |
|
int j; |
| 341 |
< |
float *lv_mod; /* 145 luminance values*/ |
| 342 |
< |
/* 145 directions for the calculation of the normalization coefficient, coefficient Perez model */ |
| 341 |
> |
|
| 342 |
> |
float *lv_mod; /* 145 luminance values */ |
| 343 |
|
float *theta_o, *phi_o; |
| 344 |
|
double dzeta, gamma; |
| 345 |
|
double normfactor; |
| 346 |
+ |
double erbs_s0, erbs_kt; |
| 347 |
|
|
| 348 |
|
|
| 310 |
– |
|
| 349 |
|
/* compute solar direction */ |
| 350 |
< |
|
| 350 |
> |
|
| 351 |
|
if (month) { /* from date and time */ |
| 352 |
< |
int jd; |
| 315 |
< |
double sd, st; |
| 352 |
> |
double sd; |
| 353 |
|
|
| 354 |
< |
jd = jdate(month, day); /* Julian date */ |
| 355 |
< |
sd = sdec(jd); /* solar declination */ |
| 356 |
< |
if (tsolar) /* solar time */ |
| 357 |
< |
st = hour; |
| 354 |
> |
st = hour; |
| 355 |
> |
if (year) { /* Michalsky algorithm? */ |
| 356 |
> |
double mjd = mjdate(year, month, day, hour); |
| 357 |
> |
if (tsolar) |
| 358 |
> |
sd = msdec(mjd, NULL); |
| 359 |
> |
else |
| 360 |
> |
sd = msdec(mjd, &st); |
| 361 |
> |
} else { |
| 362 |
> |
int jd = jdate(month, day); /* Julian date */ |
| 363 |
> |
sd = sdec(jd); /* solar declination */ |
| 364 |
> |
if (!tsolar) /* get solar time? */ |
| 365 |
> |
st = hour + stadj(jd); |
| 366 |
> |
} |
| 367 |
> |
|
| 368 |
> |
if(timeinterval) { |
| 369 |
> |
|
| 370 |
> |
if(timeinterval<0) { |
| 371 |
> |
fprintf(stderr, "time interval negative\n"); |
| 372 |
> |
exit(1); |
| 373 |
> |
} |
| 374 |
> |
|
| 375 |
> |
if(fabs(solar_sunrise(month,day)-st)<=timeinterval/120) { |
| 376 |
> |
st= (st+timeinterval/120+solar_sunrise(month,day))/2; |
| 377 |
> |
if(suppress_warnings==0) |
| 378 |
> |
{ fprintf(stderr, "Solar position corrected at time step %d %d %.3f\n",month,day,hour); } |
| 379 |
> |
} |
| 380 |
> |
|
| 381 |
> |
if(fabs(solar_sunset(month,day)-st)<timeinterval/120) { |
| 382 |
> |
st= (st-timeinterval/120+solar_sunset(month,day))/2; |
| 383 |
> |
if(suppress_warnings==0) |
| 384 |
> |
{ fprintf(stderr, "Solar position corrected at time step %d %d %.3f\n",month,day,hour); } |
| 385 |
> |
} |
| 386 |
> |
|
| 387 |
> |
if((st<solar_sunrise(month,day)-timeinterval/120) || (st>solar_sunset(month,day)+timeinterval/120)) { |
| 388 |
> |
if(suppress_warnings==0) |
| 389 |
> |
{ fprintf(stderr, "Warning: sun position too low, printing error sky at %d %d %.3f\n",month,day,hour); } |
| 390 |
> |
altitude = salt(sd, st); |
| 391 |
> |
azimuth = sazi(sd, st); |
| 392 |
> |
print_error_sky(); |
| 393 |
> |
exit(0); |
| 394 |
> |
} |
| 395 |
> |
} |
| 396 |
|
else |
| 397 |
< |
st = hour + stadj(jd); |
| 397 |
> |
|
| 398 |
> |
if(st<solar_sunrise(month,day) || st>solar_sunset(month,day)) { |
| 399 |
> |
if(suppress_warnings==0) |
| 400 |
> |
{ fprintf(stderr, "Warning: sun altitude below zero at time step %i %i %.2f, printing error sky\n",month,day,hour); } |
| 401 |
> |
altitude = salt(sd, st); |
| 402 |
> |
azimuth = sazi(sd, st); |
| 403 |
> |
print_error_sky(); |
| 404 |
> |
exit(0); |
| 405 |
> |
} |
| 406 |
> |
|
| 407 |
|
altitude = salt(sd, st); |
| 408 |
|
azimuth = sazi(sd, st); |
| 409 |
|
|
| 410 |
|
daynumber = (double)jdate(month, day); |
| 411 |
< |
|
| 411 |
> |
|
| 412 |
|
} |
| 413 |
|
|
| 414 |
|
|
| 415 |
< |
|
| 416 |
< |
|
| 333 |
< |
|
| 334 |
< |
/* if loop for the -l option. 01/2013 Sprenger */ |
| 335 |
< |
|
| 336 |
< |
if (altitude*180/M_PI < sunaltitude_border) { |
| 337 |
< |
|
| 338 |
< |
if (suppress_warnings==0) |
| 339 |
< |
fprintf(stderr, "Warning: sun altitude (%.3f degrees) below the border (%.3f degrees)\n",altitude*180/M_PI,sunaltitude_border); |
| 340 |
< |
print_error_sky(); |
| 341 |
< |
exit(0); |
| 342 |
< |
} |
| 343 |
< |
|
| 344 |
< |
|
| 415 |
> |
|
| 416 |
> |
|
| 417 |
|
|
| 346 |
– |
|
| 347 |
– |
|
| 418 |
|
if (!cloudy && altitude > 87.*M_PI/180.) { |
| 419 |
|
|
| 420 |
|
if (suppress_warnings==0) { |
| 425 |
|
altitude = 87.*M_PI/180.; |
| 426 |
|
} |
| 427 |
|
|
| 428 |
+ |
|
| 429 |
+ |
|
| 430 |
|
sundir[0] = -sin(azimuth)*cos(altitude); |
| 431 |
|
sundir[1] = -cos(azimuth)*cos(altitude); |
| 432 |
|
sundir[2] = sin(altitude); |
| 434 |
|
|
| 435 |
|
/* calculation for the new functions */ |
| 436 |
|
sunzenith = 90 - altitude*180/M_PI; |
| 437 |
< |
|
| 366 |
< |
|
| 437 |
> |
|
| 438 |
|
|
| 439 |
|
/* compute the inputs for the calculation of the light distribution over the sky*/ |
| 440 |
< |
if (input==0) |
| 440 |
> |
if (input==0) /* P */ |
| 441 |
|
{ |
| 442 |
|
check_parametrization(); |
| 443 |
|
diffuseirradiance = diffuse_irradiance_from_sky_brightness(); /*diffuse horizontal irradiance*/ |
| 453 |
|
} |
| 454 |
|
|
| 455 |
|
|
| 456 |
< |
else if (input==1) |
| 456 |
> |
else if (input==1) /* W */ |
| 457 |
|
{ |
| 458 |
|
check_irradiances(); |
| 459 |
|
skybrightness = sky_brightness(); |
| 460 |
|
skyclearness = sky_clearness(); |
| 461 |
+ |
|
| 462 |
|
check_parametrization(); |
| 463 |
< |
|
| 463 |
> |
|
| 464 |
|
if (output==0 || output==2) |
| 465 |
|
{ |
| 466 |
|
diffuseilluminance = diffuseirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/ |
| 471 |
|
} |
| 472 |
|
|
| 473 |
|
|
| 474 |
< |
else if (input==2) |
| 474 |
> |
else if (input==2) /* L */ |
| 475 |
|
{ |
| 476 |
|
check_illuminances(); |
| 477 |
|
illu_to_irra_index(); |
| 479 |
|
} |
| 480 |
|
|
| 481 |
|
|
| 482 |
< |
else if (input==3) |
| 482 |
> |
else if (input==3) /* G */ |
| 483 |
|
{ |
| 484 |
|
if (altitude<=0) |
| 485 |
|
{ |
| 486 |
|
if (suppress_warnings==0) |
| 487 |
< |
fprintf(stderr, "Warning: solar zenith angle larger than 90 degrees; using zero irradiance to proceed\n"); |
| 487 |
> |
fprintf(stderr, "Warning: sun altitude < 0, proceed with irradiance values of zero\n"); |
| 488 |
|
directirradiance = 0; |
| 489 |
|
diffuseirradiance = 0; |
| 490 |
|
} else { |
| 491 |
< |
directirradiance=directirradiance/sin(altitude); |
| 491 |
> |
|
| 492 |
> |
directirradiance=directirradiance/sin(altitude); |
| 493 |
|
} |
| 494 |
+ |
|
| 495 |
|
check_irradiances(); |
| 496 |
|
skybrightness = sky_brightness(); |
| 497 |
|
skyclearness = sky_clearness(); |
| 506 |
|
|
| 507 |
|
} |
| 508 |
|
|
| 509 |
+ |
|
| 510 |
+ |
else if (input==4) /* E */ /* Implementation of the Erbs model. W.Sprenger (04/13) */ |
| 511 |
+ |
{ |
| 512 |
+ |
|
| 513 |
+ |
if (altitude<=0) |
| 514 |
+ |
{ |
| 515 |
+ |
if (suppress_warnings==0 && globalirradiance > 50) |
| 516 |
+ |
fprintf(stderr, "Warning: global irradiance higher than 50 W/m^2 while the sun altitude is lower than zero\n"); |
| 517 |
+ |
globalirradiance = 0; diffuseirradiance = 0; directirradiance = 0; |
| 518 |
+ |
|
| 519 |
+ |
} else { |
| 520 |
+ |
|
| 521 |
+ |
erbs_s0 = solar_constant_e*get_eccentricity()*sin(altitude); |
| 522 |
+ |
|
| 523 |
+ |
if (globalirradiance>erbs_s0) |
| 524 |
+ |
{ |
| 525 |
+ |
if (suppress_warnings==0) |
| 526 |
+ |
fprintf(stderr, "Warning: global irradiance is higher than the time-dependent solar constant s0\n"); |
| 527 |
+ |
globalirradiance=erbs_s0*0.999; |
| 528 |
+ |
} |
| 529 |
+ |
|
| 530 |
+ |
erbs_kt=globalirradiance/erbs_s0; |
| 531 |
+ |
|
| 532 |
+ |
if (erbs_kt<=0.22) diffuseirradiance=globalirradiance*(1-0.09*erbs_kt); |
| 533 |
+ |
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)); |
| 534 |
+ |
else if (erbs_kt<1) diffuseirradiance=globalirradiance*(0.165); |
| 535 |
+ |
|
| 536 |
+ |
directirradiance=globalirradiance-diffuseirradiance; |
| 537 |
+ |
|
| 538 |
+ |
printf("# erbs_s0, erbs_kt, irr_dir_h, irr_diff: %.3f %.3f %.3f %.3f\n", erbs_s0, erbs_kt, directirradiance, diffuseirradiance); |
| 539 |
+ |
printf("# WARNING: the -E option is only recommended for a rough estimation!\n"); |
| 540 |
+ |
|
| 541 |
+ |
directirradiance=directirradiance/sin(altitude); |
| 542 |
+ |
|
| 543 |
+ |
} |
| 544 |
+ |
|
| 545 |
+ |
check_irradiances(); |
| 546 |
+ |
skybrightness = sky_brightness(); |
| 547 |
+ |
skyclearness = sky_clearness(); |
| 548 |
+ |
check_parametrization(); |
| 549 |
+ |
|
| 550 |
+ |
if (output==0 || output==2) |
| 551 |
+ |
{ |
| 552 |
+ |
diffuseilluminance = diffuseirradiance*glob_h_diffuse_effi_PEREZ();/*diffuse horizontal illuminance*/ |
| 553 |
+ |
directilluminance = directirradiance*direct_n_effi_PEREZ(); |
| 554 |
+ |
check_illuminances(); |
| 555 |
+ |
} |
| 556 |
+ |
|
| 557 |
+ |
} |
| 558 |
+ |
|
| 559 |
+ |
|
| 560 |
+ |
|
| 561 |
|
|
| 562 |
< |
else {fprintf(stderr,"error in giving the input arguments"); exit(1);} |
| 562 |
> |
else { fprintf(stderr,"error at the input arguments"); exit(1); } |
| 563 |
|
|
| 564 |
|
|
| 565 |
|
|
| 566 |
|
/* normalization factor for the relative sky luminance distribution, diffuse part*/ |
| 567 |
< |
|
| 567 |
> |
|
| 568 |
|
if ( (lv_mod = malloc(145*sizeof(float))) == NULL) |
| 569 |
|
{ |
| 570 |
|
fprintf(stderr,"Out of memory in function main"); |
| 574 |
|
/* read the angles */ |
| 575 |
|
theta_o = defangle_theta; |
| 576 |
|
phi_o = defangle_phi; |
| 577 |
+ |
|
| 578 |
|
|
| 579 |
|
/* parameters for the perez model */ |
| 580 |
|
coeff_lum_perez(radians(sunzenith), skyclearness, skybrightness, coeff_perez); |
| 581 |
|
|
| 582 |
+ |
|
| 583 |
+ |
|
| 584 |
|
/*calculation of the modelled luminance */ |
| 585 |
|
for (j=0;j<145;j++) |
| 586 |
|
{ |
| 587 |
|
theta_phi_to_dzeta_gamma(radians(*(theta_o+j)),radians(*(phi_o+j)),&dzeta,&gamma,radians(sunzenith)); |
| 588 |
+ |
|
| 589 |
|
*(lv_mod+j) = calc_rel_lum_perez(dzeta,gamma,radians(sunzenith),skyclearness,skybrightness,coeff_perez); |
| 590 |
< |
// printf("theta, phi, lv_mod %f\t %f\t %f\n", *(theta_o+j),*(phi_o+j),*(lv_mod+j)); |
| 590 |
> |
|
| 591 |
> |
/* fprintf(stderr,"theta, phi, lv_mod %f\t %f\t %f\n", *(theta_o+j),*(phi_o+j),*(lv_mod+j)); */ |
| 592 |
|
} |
| 593 |
< |
|
| 593 |
> |
|
| 594 |
|
/* integration of luminance for the normalization factor, diffuse part of the sky*/ |
| 595 |
+ |
|
| 596 |
|
diffnormalization = integ_lv(lv_mod, theta_o); |
| 465 |
– |
/*printf("perez integration %lf\n", diffnormalization);*/ |
| 597 |
|
|
| 467 |
– |
|
| 598 |
|
|
| 599 |
|
|
| 600 |
|
/*normalization coefficient in lumen or in watt*/ |
| 626 |
|
else |
| 627 |
|
solarradiance = directilluminance/(2*M_PI*(1-cos(half_sun_angle*M_PI/180))); |
| 628 |
|
|
| 499 |
– |
|
| 629 |
|
|
| 630 |
|
|
| 631 |
< |
/* Compute the ground radiance */ |
| 632 |
< |
zenithbr=calc_rel_lum_perez(0.0,radians(sunzenith),radians(sunzenith),skyclearness,skybrightness,coeff_perez); |
| 633 |
< |
zenithbr*=diffnormalization; |
| 631 |
> |
/* Compute the ground radiance */ |
| 632 |
> |
zenithbr=calc_rel_lum_perez(0.0,radians(sunzenith),radians(sunzenith),skyclearness,skybrightness,coeff_perez); |
| 633 |
> |
zenithbr*=diffnormalization; |
| 634 |
|
|
| 635 |
< |
if (skyclearness==1) |
| 635 |
> |
if (skyclearness==1) |
| 636 |
|
normfactor = 0.777778; |
| 637 |
|
|
| 638 |
< |
if (skyclearness>=6) |
| 638 |
> |
if (skyclearness>=6) |
| 639 |
|
{ |
| 640 |
|
F2 = 0.274*(0.91 + 10.0*exp(-3.0*(M_PI/2.0-altitude)) + 0.45*sundir[2]*sundir[2]); |
| 641 |
|
normfactor = normsc()/F2/M_PI; |
| 642 |
|
} |
| 643 |
|
|
| 644 |
< |
if ( (skyclearness>1) && (skyclearness<6) ) |
| 644 |
> |
if ( (skyclearness>1) && (skyclearness<6) ) |
| 645 |
|
{ |
| 646 |
|
S_INTER=1; |
| 647 |
|
F2 = (2.739 + .9891*sin(.3119+2.6*altitude)) * exp(-(M_PI/2.0-altitude)*(.4441+1.48*altitude)); |
| 648 |
|
normfactor = normsc()/F2/M_PI; |
| 649 |
|
} |
| 650 |
|
|
| 651 |
< |
groundbr = zenithbr*normfactor; |
| 651 |
> |
groundbr = zenithbr*normfactor; |
| 652 |
|
|
| 653 |
< |
if (dosun&&(skyclearness>1)) |
| 653 |
> |
if (dosun&&(skyclearness>1)) |
| 654 |
|
groundbr += 6.8e-5/M_PI*solarradiance*sundir[2]; |
| 655 |
|
|
| 656 |
< |
groundbr *= gprefl; |
| 656 |
> |
groundbr *= gprefl; |
| 657 |
|
|
| 658 |
|
|
| 659 |
+ |
|
| 660 |
+ |
if(*(c_perez+1)>0) |
| 661 |
+ |
{ |
| 662 |
+ |
if(suppress_warnings==0) |
| 663 |
+ |
{ fprintf(stderr, "Warning: positive Perez parameter B (= %lf), printing error sky\n",*(c_perez+1));} |
| 664 |
+ |
print_error_sky(); |
| 665 |
+ |
exit(0); |
| 666 |
+ |
} |
| 667 |
|
|
| 668 |
+ |
|
| 669 |
|
return; |
| 670 |
|
} |
| 671 |
|
|
| 672 |
|
|
| 673 |
|
|
| 674 |
|
|
| 675 |
< |
void print_error_sky() |
| 675 |
> |
|
| 676 |
> |
double solar_sunset(int month,int day) |
| 677 |
|
{ |
| 678 |
< |
sundir[0] = -sin(azimuth)*cos(altitude); |
| 679 |
< |
sundir[1] = -cos(azimuth)*cos(altitude); |
| 680 |
< |
sundir[2] = sin(altitude); |
| 681 |
< |
|
| 543 |
< |
printf("\nvoid brightfunc skyfunc\n"); |
| 544 |
< |
printf("2 skybright perezlum.cal\n"); |
| 545 |
< |
printf("0\n"); |
| 546 |
< |
printf("10 0.00 0.00 0.000 0.000 0.000 0.000 0.000 %f %f %f \n", sundir[0], sundir[1], sundir[2]); |
| 678 |
> |
float W; |
| 679 |
> |
extern double s_latitude; |
| 680 |
> |
W=-1*(tan(s_latitude)*tan(sdec(jdate(month, day)))); |
| 681 |
> |
return(12+(M_PI/2 - atan2(W,sqrt(1-W*W)))*180/(M_PI*15)); |
| 682 |
|
} |
| 548 |
– |
|
| 683 |
|
|
| 684 |
|
|
| 685 |
< |
void printsky() /* print out sky */ |
| 685 |
> |
|
| 686 |
> |
|
| 687 |
> |
double solar_sunrise(int month,int day) |
| 688 |
|
{ |
| 689 |
+ |
float W; |
| 690 |
+ |
extern double s_latitude; |
| 691 |
+ |
W=-1*(tan(s_latitude)*tan(sdec(jdate(month, day)))); |
| 692 |
+ |
return(12-(M_PI/2 - atan2(W,sqrt(1-W*W)))*180/(M_PI*15)); |
| 693 |
+ |
} |
| 694 |
+ |
|
| 695 |
+ |
|
| 696 |
+ |
|
| 697 |
+ |
|
| 698 |
+ |
void printsky() |
| 699 |
+ |
{ |
| 700 |
+ |
|
| 701 |
+ |
printf("# Local solar time: %.2f\n", st); |
| 702 |
+ |
printf("# Solar altitude and azimuth: %.1f %.1f\n", altitude*180/M_PI, azimuth*180/M_PI); |
| 703 |
+ |
|
| 704 |
+ |
|
| 705 |
|
if (dosun&&(skyclearness>1)) |
| 706 |
|
{ |
| 707 |
|
printf("\nvoid light solar\n"); |
| 718 |
|
printf("0\n0\n"); |
| 719 |
|
printf("4 %f %f %f %f\n", sundir[0], sundir[1], sundir[2], 2*half_sun_angle); |
| 720 |
|
} |
| 721 |
+ |
/* print colored output if activated in command line (-C). Based on model from A. Diakite, TU-Berlin. Implemented by J. Wienold, August 26 2018 */ |
| 722 |
+ |
if (color_output==1 && skyclearness < 4.5 && skyclearness >1.065 ) |
| 723 |
+ |
{ |
| 724 |
+ |
fprintf(stderr, " warning: sky clearness(epsilon)= %f \n",skyclearness); |
| 725 |
+ |
fprintf(stderr, " warning: intermediate sky!! \n"); |
| 726 |
+ |
fprintf(stderr, " warning: color model for intermediate sky pending \n"); |
| 727 |
+ |
fprintf(stderr, " warning: no color output ! \n"); |
| 728 |
+ |
color_output=0; |
| 729 |
+ |
} |
| 730 |
+ |
if (color_output==1) |
| 731 |
+ |
{ |
| 732 |
+ |
printf("\nvoid colorfunc skyfunc\n"); |
| 733 |
+ |
printf("4 skybright_r skybright_g skybright_b perezlum_c.cal\n"); |
| 734 |
+ |
printf("0\n"); |
| 735 |
+ |
printf("22 %.3e %.3e %lf %lf %lf %lf %lf %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f\n", diffnormalization, groundbr, |
| 736 |
+ |
*(c_perez+0),*(c_perez+1),*(c_perez+2),*(c_perez+3),*(c_perez+4), |
| 737 |
+ |
sundir[0], sundir[1], sundir[2],skyclearness,locus[0],locus[1],locus[2],locus[3],locus[4],locus[5],locus[6],locus[7],locus[8],locus[9],locus[10]); |
| 738 |
+ |
}else{ |
| 739 |
+ |
printf("\nvoid brightfunc skyfunc\n"); |
| 740 |
+ |
printf("2 skybright perezlum.cal\n"); |
| 741 |
+ |
printf("0\n"); |
| 742 |
+ |
printf("10 %.3e %.3e %lf %lf %lf %lf %lf %f %f %f \n", diffnormalization, groundbr, |
| 743 |
+ |
*(c_perez+0),*(c_perez+1),*(c_perez+2),*(c_perez+3),*(c_perez+4), |
| 744 |
+ |
sundir[0], sundir[1], sundir[2]); |
| 745 |
+ |
} |
| 746 |
|
|
| 747 |
+ |
} |
| 748 |
+ |
|
| 749 |
+ |
|
| 750 |
+ |
|
| 751 |
+ |
void print_error_sky() |
| 752 |
+ |
{ |
| 753 |
+ |
|
| 754 |
+ |
|
| 755 |
+ |
sundir[0] = -sin(azimuth)*cos(altitude); |
| 756 |
+ |
sundir[1] = -cos(azimuth)*cos(altitude); |
| 757 |
+ |
sundir[2] = sin(altitude); |
| 758 |
+ |
|
| 759 |
+ |
printf("# Local solar time: %.2f\n", st); |
| 760 |
+ |
printf("# Solar altitude and azimuth: %.1f %.1f\n", altitude*180/M_PI, azimuth*180/M_PI); |
| 761 |
+ |
|
| 762 |
|
printf("\nvoid brightfunc skyfunc\n"); |
| 763 |
|
printf("2 skybright perezlum.cal\n"); |
| 764 |
|
printf("0\n"); |
| 765 |
< |
printf("10 %.3e %.3e %lf %lf %lf %lf %lf %f %f %f \n", diffnormalization, groundbr, |
| 574 |
< |
*(c_perez+0),*(c_perez+1),*(c_perez+2),*(c_perez+3),*(c_perez+4), |
| 575 |
< |
sundir[0], sundir[1], sundir[2]); |
| 765 |
> |
printf("10 0.00 0.00 0.000 0.000 0.000 0.000 0.000 %f %f %f \n", sundir[0], sundir[1], sundir[2]); |
| 766 |
|
} |
| 767 |
+ |
|
| 768 |
|
|
| 769 |
|
|
| 770 |
+ |
|
| 771 |
+ |
|
| 772 |
|
void printdefaults() /* print default values */ |
| 773 |
|
{ |
| 774 |
|
printf("-g %f\t\t\t# Ground plane reflectance\n", gprefl); |
| 782 |
|
} |
| 783 |
|
|
| 784 |
|
|
| 785 |
< |
void userror(char* msg) /* print usage error and quit */ |
| 785 |
> |
|
| 786 |
> |
|
| 787 |
> |
void usage_error(char* msg) /* print usage error and quit */ |
| 788 |
|
{ |
| 789 |
|
if (msg != NULL) |
| 790 |
< |
fprintf(stderr, "%s: Use error - %s\n", progname, msg); |
| 791 |
< |
fprintf(stderr, "Usage: %s month day hour [-P|-W|-L|-G] direct_value diffuse_value [options]\n", progname); |
| 792 |
< |
fprintf(stderr, "or: %s -ang altitude azimuth [-P|-W|-L|-G] direct_value diffuse_value [options]\n", progname); |
| 790 |
> |
fprintf(stderr, "%s: Use error - %s\n\n", progname, msg); |
| 791 |
> |
fprintf(stderr, "Usage: %s month day hour [...]\n", progname); |
| 792 |
> |
fprintf(stderr, " or: %s -ang altitude azimuth [...]\n", progname); |
| 793 |
> |
fprintf(stderr, " followed by: -P epsilon delta [options]\n"); |
| 794 |
> |
fprintf(stderr, " or: [-W|-L|-G] direct_value diffuse_value [options]\n"); |
| 795 |
> |
fprintf(stderr, " or: -E global_irradiance [options]\n\n"); |
| 796 |
> |
fprintf(stderr, " Description:\n"); |
| 797 |
|
fprintf(stderr, " -P epsilon delta (these are the Perez parameters) \n"); |
| 798 |
|
fprintf(stderr, " -W direct-normal-irradiance diffuse-horizontal-irradiance (W/m^2)\n"); |
| 799 |
|
fprintf(stderr, " -L direct-normal-illuminance diffuse-horizontal-illuminance (lux)\n"); |
| 800 |
|
fprintf(stderr, " -G direct-horizontal-irradiance diffuse-horizontal-irradiance (W/m^2)\n"); |
| 801 |
+ |
fprintf(stderr, " -E global-horizontal-irradiance (W/m^2)\n\n"); |
| 802 |
+ |
fprintf(stderr, " Output specification with option:\n"); |
| 803 |
|
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"); |
| 804 |
< |
fprintf(stderr, " gendaylit version 2.00 (2013/01/28) \n"); |
| 804 |
> |
fprintf(stderr, " gendaylit version 2.5 (2018/04/18) \n\n"); |
| 805 |
|
exit(1); |
| 806 |
|
} |
| 807 |
|
|
| 808 |
|
|
| 809 |
|
|
| 810 |
+ |
|
| 811 |
|
double normsc() /* compute normalization factor (E0*F2/L0) */ |
| 812 |
|
{ |
| 813 |
|
static double nfc[2][5] = { |
| 831 |
|
|
| 832 |
|
|
| 833 |
|
|
| 834 |
+ |
|
| 835 |
+ |
|
| 836 |
|
void printhead(int ac, char** av) /* print command header */ |
| 837 |
|
{ |
| 838 |
|
putchar('#'); |
| 857 |
|
double value; |
| 858 |
|
double category_bounds[10], a[10], b[10], c[10], d[10]; |
| 859 |
|
int category_total_number, category_number, i; |
| 860 |
< |
|
| 861 |
< |
|
| 862 |
< |
if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 863 |
< |
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_effi_PEREZ \n"); |
| 864 |
< |
|
| 860 |
> |
|
| 861 |
> |
check_parametrization(); |
| 862 |
> |
|
| 863 |
> |
|
| 864 |
> |
/*if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 865 |
> |
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_effi_PEREZ \n"); */ |
| 866 |
> |
|
| 867 |
> |
|
| 868 |
|
/* initialize category bounds (clearness index bounds) */ |
| 869 |
|
|
| 870 |
|
category_total_number = 8; |
| 919 |
|
|
| 920 |
|
|
| 921 |
|
|
| 715 |
– |
|
| 922 |
|
for (i=1; i<=category_total_number; i++) |
| 923 |
|
{ |
| 924 |
|
if ( (skyclearness >= category_bounds[i]) && (skyclearness < category_bounds[i+1]) ) |
| 932 |
|
} |
| 933 |
|
|
| 934 |
|
|
| 935 |
+ |
|
| 936 |
+ |
|
| 937 |
|
/* global horizontal diffuse efficacy model, according to PEREZ */ |
| 938 |
|
double glob_h_diffuse_effi_PEREZ() |
| 939 |
|
{ |
| 941 |
|
double category_bounds[10], a[10], b[10], c[10], d[10]; |
| 942 |
|
int category_total_number, category_number, i; |
| 943 |
|
|
| 944 |
+ |
check_parametrization(); |
| 945 |
|
|
| 946 |
< |
if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 947 |
< |
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_diffuse_effi_PEREZ \n"); |
| 948 |
< |
|
| 946 |
> |
|
| 947 |
> |
/*if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 948 |
> |
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function glob_h_diffuse_PEREZ \n"); */ |
| 949 |
> |
|
| 950 |
|
/* initialize category bounds (clearness index bounds) */ |
| 951 |
|
|
| 952 |
|
category_total_number = 8; |
| 953 |
|
|
| 954 |
< |
//XXX: category_bounds > 0.1 |
| 954 |
> |
//XXX: category_bounds > 0.1 |
| 955 |
|
category_bounds[1] = 1; |
| 956 |
|
category_bounds[2] = 1.065; |
| 957 |
|
category_bounds[3] = 1.230; |
| 1002 |
|
|
| 1003 |
|
|
| 1004 |
|
|
| 795 |
– |
|
| 1005 |
|
category_number = -1; |
| 1006 |
|
for (i=1; i<=category_total_number; i++) |
| 1007 |
|
{ |
| 1011 |
|
|
| 1012 |
|
if (category_number == -1) { |
| 1013 |
|
if (suppress_warnings==0) |
| 1014 |
< |
fprintf(stderr, "ERROR: Model parameters out of range\n"); |
| 1014 |
> |
fprintf(stderr, "Warning: sky clearness (= %.3f) too high, printing error sky\n", skyclearness); |
| 1015 |
|
print_error_sky(); |
| 1016 |
< |
exit(1); |
| 1016 |
> |
exit(0); |
| 1017 |
|
} |
| 1018 |
|
|
| 1019 |
|
|
| 1021 |
|
d[category_number]*log(skybrightness); |
| 1022 |
|
|
| 1023 |
|
return(value); |
| 1024 |
+ |
|
| 1025 |
|
} |
| 1026 |
|
|
| 1027 |
|
|
| 1028 |
+ |
|
| 1029 |
+ |
|
| 1030 |
+ |
|
| 1031 |
+ |
|
| 1032 |
|
/* direct normal efficacy model, according to PEREZ */ |
| 1033 |
|
|
| 1034 |
|
double direct_n_effi_PEREZ() |
| 1039 |
|
int category_total_number, category_number, i; |
| 1040 |
|
|
| 1041 |
|
|
| 1042 |
< |
if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 1043 |
< |
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function direct_n_effi_PEREZ \n"); |
| 1042 |
> |
/*if ((skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) && suppress_warnings==0) |
| 1043 |
> |
fprintf(stderr, "Warning: skyclearness or skybrightness out of range in function direct_n_effi_PEREZ \n");*/ |
| 1044 |
|
|
| 1045 |
|
|
| 1046 |
|
/* initialize category bounds (clearness index bounds) */ |
| 1114 |
|
/*check the range of epsilon and delta indexes of the perez parametrization*/ |
| 1115 |
|
void check_parametrization() |
| 1116 |
|
{ |
| 1117 |
+ |
|
| 1118 |
|
if (skyclearness<skyclearinf || skyclearness>skyclearsup || skybrightness<skybriginf || skybrightness>skybrigsup) |
| 1119 |
|
{ |
| 1120 |
|
|
| 1121 |
|
/* limit sky clearness or sky brightness, 2009 11 13 by J. Wienold */ |
| 1122 |
+ |
|
| 1123 |
|
if (skyclearness<skyclearinf){ |
| 1124 |
+ |
/* if (suppress_warnings==0) |
| 1125 |
+ |
fprintf(stderr,"Range warning: sky clearness too low (%lf)\n", skyclearness); */ |
| 1126 |
|
skyclearness=skyclearinf; |
| 909 |
– |
if (suppress_warnings==0) |
| 910 |
– |
fprintf(stderr,"Range warning: sky clearness too low (%lf)\n", skyclearness); |
| 1127 |
|
} |
| 1128 |
|
if (skyclearness>skyclearsup){ |
| 1129 |
< |
skyclearness=skyclearsup-0.1; |
| 1130 |
< |
if (suppress_warnings==0) |
| 1131 |
< |
fprintf(stderr,"Range warning: sky clearness too high (%lf)\n", skyclearness); |
| 1129 |
> |
/* if (suppress_warnings==0) |
| 1130 |
> |
fprintf(stderr,"Range warning: sky clearness too high (%lf)\n", skyclearness); */ |
| 1131 |
> |
skyclearness=skyclearsup-0.001; |
| 1132 |
|
} |
| 1133 |
|
if (skybrightness<skybriginf){ |
| 1134 |
+ |
/* if (suppress_warnings==0) |
| 1135 |
+ |
fprintf(stderr,"Range warning: sky brightness too low (%lf)\n", skybrightness); */ |
| 1136 |
|
skybrightness=skybriginf; |
| 919 |
– |
if (suppress_warnings==0) |
| 920 |
– |
fprintf(stderr,"Range warning: sky brightness too low (%lf)\n", skybrightness); |
| 1137 |
|
} |
| 1138 |
|
if (skybrightness>skybrigsup){ |
| 1139 |
+ |
/* if (suppress_warnings==0) |
| 1140 |
+ |
fprintf(stderr,"Range warning: sky brightness too high (%lf)\n", skybrightness); */ |
| 1141 |
|
skybrightness=skybrigsup; |
| 924 |
– |
if (suppress_warnings==0) |
| 925 |
– |
fprintf(stderr,"Range warning: sky brightness too high (%lf)\n", skybrightness); |
| 1142 |
|
} |
| 1143 |
|
|
| 1144 |
|
return; } |
| 1146 |
|
} |
| 1147 |
|
|
| 1148 |
|
|
| 1149 |
+ |
|
| 1150 |
+ |
|
| 1151 |
+ |
|
| 1152 |
|
/* validity of the direct and diffuse components */ |
| 1153 |
|
void check_illuminances() |
| 1154 |
|
{ |
| 1155 |
|
if (directilluminance < 0) { |
| 1156 |
< |
fprintf(stderr,"WARNING: direct illuminance < 0. Using 0.0\n"); |
| 1156 |
> |
if(suppress_warnings==0) |
| 1157 |
> |
{ fprintf(stderr,"Warning: direct illuminance < 0. Using 0.0\n"); } |
| 1158 |
|
directilluminance = 0.0; |
| 1159 |
|
} |
| 1160 |
|
if (diffuseilluminance < 0) { |
| 1161 |
< |
fprintf(stderr,"WARNING: diffuse illuminance < 0. Using 0.0\n"); |
| 1161 |
> |
if(suppress_warnings==0) |
| 1162 |
> |
{ fprintf(stderr,"Warning: diffuse illuminance < 0. Using 0.0\n"); } |
| 1163 |
|
diffuseilluminance = 0.0; |
| 1164 |
|
} |
| 1165 |
< |
if (directilluminance > solar_constant_l*1000.0) { |
| 1166 |
< |
fprintf(stderr,"ERROR: direct illuminance exceeds solar constant\n"); |
| 1167 |
< |
exit(1); |
| 1165 |
> |
|
| 1166 |
> |
if (directilluminance+diffuseilluminance==0 && altitude > 0) { |
| 1167 |
> |
if(suppress_warnings==0) |
| 1168 |
> |
{ fprintf(stderr,"Warning: zero illuminance at sun altitude > 0, printing error sky\n"); } |
| 1169 |
> |
print_error_sky(); |
| 1170 |
> |
exit(0); |
| 1171 |
|
} |
| 1172 |
+ |
|
| 1173 |
+ |
if (directilluminance > solar_constant_l) { |
| 1174 |
+ |
if(suppress_warnings==0) |
| 1175 |
+ |
{ fprintf(stderr,"Warning: direct illuminance exceeds solar constant\n"); } |
| 1176 |
+ |
print_error_sky(); |
| 1177 |
+ |
exit(0); |
| 1178 |
+ |
} |
| 1179 |
|
} |
| 1180 |
|
|
| 1181 |
|
|
| 1182 |
|
void check_irradiances() |
| 1183 |
|
{ |
| 1184 |
|
if (directirradiance < 0) { |
| 1185 |
< |
fprintf(stderr,"WARNING: direct irradiance < 0. Using 0.0\n"); |
| 1185 |
> |
if(suppress_warnings==0) |
| 1186 |
> |
{ fprintf(stderr,"Warning: direct irradiance < 0. Using 0.0\n"); } |
| 1187 |
|
directirradiance = 0.0; |
| 1188 |
|
} |
| 1189 |
|
if (diffuseirradiance < 0) { |
| 1190 |
< |
fprintf(stderr,"WARNING: diffuse irradiance < 0. Using 0.0\n"); |
| 1190 |
> |
if(suppress_warnings==0) |
| 1191 |
> |
{ fprintf(stderr,"Warning: diffuse irradiance < 0. Using 0.0\n"); } |
| 1192 |
|
diffuseirradiance = 0.0; |
| 1193 |
|
} |
| 1194 |
+ |
|
| 1195 |
+ |
if (directirradiance+diffuseirradiance==0 && altitude > 0) { |
| 1196 |
+ |
if(suppress_warnings==0) |
| 1197 |
+ |
{ fprintf(stderr,"Warning: zero irradiance at sun altitude > 0, printing error sky\n"); } |
| 1198 |
+ |
print_error_sky(); |
| 1199 |
+ |
exit(0); |
| 1200 |
+ |
} |
| 1201 |
+ |
|
| 1202 |
|
if (directirradiance > solar_constant_e) { |
| 1203 |
< |
fprintf(stderr,"ERROR: direct irradiance exceeds solar constant\n"); |
| 1204 |
< |
exit(1); |
| 1203 |
> |
if(suppress_warnings==0) |
| 1204 |
> |
{ fprintf(stderr,"Warning: direct irradiance exceeds solar constant\n"); } |
| 1205 |
> |
print_error_sky(); |
| 1206 |
> |
exit(0); |
| 1207 |
|
} |
| 1208 |
|
} |
| 1209 |
|
|
| 1255 |
|
} |
| 1256 |
|
|
| 1257 |
|
|
| 1258 |
+ |
|
| 1259 |
+ |
|
| 1260 |
|
void illu_to_irra_index() |
| 1261 |
|
{ |
| 1262 |
|
double test1=0.1, test2=0.1, d_eff; |
| 1263 |
|
int counter=0; |
| 1264 |
|
|
| 1265 |
< |
diffuseirradiance = diffuseilluminance*solar_constant_e/(solar_constant_l*1000); |
| 1266 |
< |
directirradiance = directilluminance*solar_constant_e/(solar_constant_l*1000); |
| 1265 |
> |
diffuseirradiance = diffuseilluminance*solar_constant_e/(solar_constant_l); |
| 1266 |
> |
directirradiance = directilluminance*solar_constant_e/(solar_constant_l); |
| 1267 |
|
skyclearness = sky_clearness(); |
| 1268 |
|
skybrightness = sky_brightness(); |
| 1269 |
|
check_parametrization(); |
| 1270 |
< |
|
| 1270 |
> |
|
| 1271 |
> |
|
| 1272 |
|
while ( ((fabs(diffuseirradiance-test1)>10) || (fabs(directirradiance-test2)>10) |
| 1273 |
< |
|| skyclearness>skyclearinf || skyclearness<skyclearsup |
| 1274 |
< |
|| skybrightness>skybriginf || skybrightness<skybrigsup ) |
| 1275 |
< |
&& !(counter==5) ) |
| 1273 |
> |
|| (!(skyclearness<skyclearinf || skyclearness>skyclearsup)) |
| 1274 |
> |
|| (!(skybrightness<skybriginf || skybrightness>skybrigsup)) ) |
| 1275 |
> |
&& !(counter==9) ) |
| 1276 |
|
{ |
| 1277 |
< |
|
| 1277 |
> |
|
| 1278 |
|
test1=diffuseirradiance; |
| 1279 |
|
test2=directirradiance; |
| 1280 |
|
counter++; |
| 1281 |
|
|
| 1282 |
|
diffuseirradiance = diffuseilluminance/glob_h_diffuse_effi_PEREZ(); |
| 1283 |
|
d_eff = direct_n_effi_PEREZ(); |
| 1284 |
+ |
|
| 1285 |
+ |
|
| 1286 |
|
if (d_eff < 0.1) |
| 1287 |
|
directirradiance = 0; |
| 1288 |
< |
else |
| 1288 |
> |
else |
| 1289 |
|
directirradiance = directilluminance/d_eff; |
| 1290 |
|
|
| 1291 |
|
skybrightness = sky_brightness(); |
| 1292 |
|
skyclearness = sky_clearness(); |
| 1293 |
|
check_parametrization(); |
| 1294 |
< |
|
| 1294 |
> |
|
| 1295 |
|
} |
| 1296 |
|
|
| 1297 |
|
|
| 1320 |
|
/* sky luminance perez model */ |
| 1321 |
|
double calc_rel_lum_perez(double dzeta,double gamma,double Z,double epsilon,double Delta,float coeff_perez[]) |
| 1322 |
|
{ |
| 1323 |
+ |
|
| 1324 |
|
float x[5][4]; |
| 1325 |
|
int i,j,num_lin; |
| 1326 |
|
double c_perez[5]; |
| 1327 |
|
|
| 1328 |
|
if ( (epsilon < skyclearinf) || (epsilon >= skyclearsup) ) |
| 1329 |
|
{ |
| 1330 |
< |
fprintf(stderr,"Epsilon out of range in function calc_rel_lum_perez!\n"); |
| 1330 |
> |
fprintf(stderr,"Error: epsilon out of range in function calc_rel_lum_perez!\n"); |
| 1331 |
|
exit(1); |
| 1332 |
|
} |
| 1333 |
|
|
| 1336 |
|
{ |
| 1337 |
|
if ( Delta < 0.2 ) Delta = 0.2; |
| 1338 |
|
} |
| 1339 |
< |
|
| 1339 |
> |
|
| 1340 |
> |
|
| 1341 |
|
num_lin = get_numlin(epsilon); |
| 1342 |
< |
|
| 1342 |
> |
|
| 1343 |
|
for (i=0;i<5;i++) |
| 1344 |
|
for (j=0;j<4;j++) |
| 1345 |
|
{ |
| 1346 |
|
x[i][j] = *(coeff_perez + 20*num_lin + 4*i +j); |
| 1347 |
< |
/* printf("x %d %d vaut %f\n",i,j,x[i][j]); */ |
| 1347 |
> |
/* fprintf(stderr,"x %d %d vaut %f\n",i,j,x[i][j]); */ |
| 1348 |
|
} |
| 1349 |
|
|
| 1350 |
|
|
| 1378 |
|
|
| 1379 |
|
if ( (epsilon < skyclearinf) || (epsilon >= skyclearsup) ) |
| 1380 |
|
{ |
| 1381 |
< |
fprintf(stderr,"Epsilon out of range in function calc_rel_lum_perez !\n"); |
| 1381 |
> |
fprintf(stderr,"Error: epsilon out of range in function coeff_lum_perez!\n"); |
| 1382 |
|
exit(1); |
| 1383 |
|
} |
| 1384 |
|
|
| 1387 |
|
{ |
| 1388 |
|
if ( Delta < 0.2 ) Delta = 0.2; |
| 1389 |
|
} |
| 1390 |
< |
|
| 1390 |
> |
|
| 1391 |
> |
|
| 1392 |
|
num_lin = get_numlin(epsilon); |
| 1393 |
|
|
| 1394 |
< |
//fprintf(stderr,"numlin %d\n", num_lin); |
| 1394 |
> |
/*fprintf(stderr,"numlin %d\n", num_lin);*/ |
| 1395 |
|
|
| 1396 |
|
for (i=0;i<5;i++) |
| 1397 |
|
for (j=0;j<4;j++) |
| 1423 |
|
} |
| 1424 |
|
|
| 1425 |
|
|
| 1426 |
+ |
|
| 1427 |
|
/* degrees into radians */ |
| 1428 |
|
double radians(double degres) |
| 1429 |
|
{ |
| 1430 |
|
return degres*M_PI/180.0; |
| 1431 |
|
} |
| 1432 |
|
|
| 1433 |
+ |
|
| 1434 |
|
/* radian into degrees */ |
| 1435 |
|
double degres(double radians) |
| 1436 |
|
{ |
| 1437 |
|
return radians/M_PI*180.0; |
| 1438 |
|
} |
| 1439 |
|
|
| 1440 |
+ |
|
| 1441 |
|
/* calculation of the angles dzeta and gamma */ |
| 1442 |
|
void theta_phi_to_dzeta_gamma(double theta,double phi,double *dzeta,double *gamma, double Z) |
| 1443 |
|
{ |
| 1447 |
|
else if ( (cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi)) > 1.1 ) |
| 1448 |
|
{ |
| 1449 |
|
printf("error in calculation of gamma (angle between point and sun"); |
| 1450 |
< |
exit(3); |
| 1450 |
> |
exit(1); |
| 1451 |
|
} |
| 1452 |
|
else |
| 1453 |
|
*gamma = acos(cos(Z)*cos(theta)+sin(Z)*sin(theta)*cos(phi)); |
| 1455 |
|
|
| 1456 |
|
|
| 1457 |
|
|
| 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 |
– |
/********************************************************************************/ |
| 1458 |
|
double integ_lv(float *lv,float *theta) |
| 1459 |
|
{ |
| 1460 |
|
int i; |
| 1461 |
|
double buffer=0.0; |
| 1462 |
< |
|
| 1462 |
> |
|
| 1463 |
|
for (i=0;i<145;i++) |
| 1464 |
+ |
{ |
| 1465 |
|
buffer += (*(lv+i))*cos(radians(*(theta+i))); |
| 1466 |
< |
|
| 1466 |
> |
} |
| 1467 |
> |
|
| 1468 |
|
return buffer*2*M_PI/144; |
| 1228 |
– |
|
| 1469 |
|
} |
| 1470 |
|
|
| 1471 |
|
|
| 1472 |
|
|
| 1233 |
– |
|
| 1234 |
– |
|
| 1235 |
– |
|
| 1473 |
|
/* enter day number(double), return E0 = square(R0/R): eccentricity correction factor */ |
| 1474 |
|
|
| 1475 |
|
double get_eccentricity() |
| 1482 |
|
0.000719*cos(2*day_angle)+0.000077*sin(2*day_angle); |
| 1483 |
|
|
| 1484 |
|
return (E0); |
| 1248 |
– |
|
| 1485 |
|
} |
| 1486 |
|
|
| 1487 |
|
|
| 1489 |
|
double air_mass() |
| 1490 |
|
{ |
| 1491 |
|
double m; |
| 1256 |
– |
|
| 1492 |
|
if (sunzenith>90) |
| 1493 |
|
{ |
| 1494 |
< |
fprintf(stderr, "Solar zenith angle larger than 90 degrees in function air_mass()\n"); |
| 1495 |
< |
exit(1); |
| 1494 |
> |
if(suppress_warnings==0) |
| 1495 |
> |
{ fprintf(stderr, "Warning: air mass has reached the maximal value\n"); } |
| 1496 |
> |
sunzenith=90; |
| 1497 |
|
} |
| 1262 |
– |
|
| 1498 |
|
m = 1/( cos(sunzenith*M_PI/180)+0.15*exp( log(93.885-sunzenith)*(-1.253) ) ); |
| 1499 |
|
return(m); |
| 1500 |
|
} |
