1 // environment_ctrl.cxx -- manager for natural environment information.
3 // Written by David Megginson, started February 2002.
5 // Copyright (C) 2002 David Megginson - david@megginson.com
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
31 #include <simgear/debug/logstream.hxx>
32 #include <simgear/structure/commands.hxx>
33 #include <simgear/structure/exception.hxx>
35 #include <Airports/simple.hxx>
36 #include <Main/fg_props.hxx>
37 #include <Main/util.hxx>
39 #include "environment_mgr.hxx"
40 #include "environment_ctrl.hxx"
44 class metar_filter : public FGAirportSearchFilter {
45 virtual bool pass(FGAirport *a) { return a->getMetar(); }
49 ////////////////////////////////////////////////////////////////////////
50 // Implementation of FGEnvironmentCtrl abstract base class.
51 ////////////////////////////////////////////////////////////////////////
53 FGEnvironmentCtrl::FGEnvironmentCtrl ()
61 FGEnvironmentCtrl::~FGEnvironmentCtrl ()
66 FGEnvironmentCtrl::setEnvironment (FGEnvironment * environment)
68 _environment = environment;
72 FGEnvironmentCtrl::setLongitudeDeg (double lon_deg)
78 FGEnvironmentCtrl::setLatitudeDeg (double lat_deg)
84 FGEnvironmentCtrl::setElevationFt (double elev_ft)
90 FGEnvironmentCtrl::setPosition (double lon_deg, double lat_deg, double elev_ft)
99 ////////////////////////////////////////////////////////////////////////
100 // Implementation of FGUserDefEnvironmentCtrl.
101 ////////////////////////////////////////////////////////////////////////
103 FGUserDefEnvironmentCtrl::FGUserDefEnvironmentCtrl ()
104 : _base_wind_speed_node(0),
105 _gust_wind_speed_node(0),
106 _current_wind_speed_kt(0),
107 _delta_wind_speed_kt(0)
111 FGUserDefEnvironmentCtrl::~FGUserDefEnvironmentCtrl ()
116 FGUserDefEnvironmentCtrl::init ()
118 // Fill in some defaults.
119 if (!fgHasNode("/environment/params/base-wind-speed-kt"))
120 fgSetDouble("/environment/params/base-wind-speed-kt",
121 fgGetDouble("/environment/wind-speed-kt"));
122 if (!fgHasNode("/environment/params/gust-wind-speed-kt"))
123 fgSetDouble("/environment/params/gust-wind-speed-kt",
124 fgGetDouble("/environment/params/base-wind-speed-kt"));
126 _base_wind_speed_node =
127 fgGetNode("/environment/params/base-wind-speed-kt", true);
128 _gust_wind_speed_node =
129 fgGetNode("/environment/params/gust-wind-speed-kt", true);
131 _current_wind_speed_kt = _base_wind_speed_node->getDoubleValue();
132 _delta_wind_speed_kt = 0.1;
136 FGUserDefEnvironmentCtrl::update (double dt)
138 double base_wind_speed = _base_wind_speed_node->getDoubleValue();
139 double gust_wind_speed = _gust_wind_speed_node->getDoubleValue();
141 if (gust_wind_speed < base_wind_speed) {
142 gust_wind_speed = base_wind_speed;
143 _gust_wind_speed_node->setDoubleValue(gust_wind_speed);
146 if (base_wind_speed == gust_wind_speed) {
147 _current_wind_speed_kt = base_wind_speed;
149 int rn = rand() % 128;
150 int sign = (_delta_wind_speed_kt < 0 ? -1 : 1);
151 double gust = _current_wind_speed_kt - base_wind_speed;
152 double incr = gust / 50;
155 _delta_wind_speed_kt = - _delta_wind_speed_kt;
157 _delta_wind_speed_kt -= incr * sign;
159 _delta_wind_speed_kt += incr * sign;
161 _current_wind_speed_kt += _delta_wind_speed_kt;
163 if (_current_wind_speed_kt < base_wind_speed) {
164 _current_wind_speed_kt = base_wind_speed;
165 _delta_wind_speed_kt = 0.01;
166 } else if (_current_wind_speed_kt > gust_wind_speed) {
167 _current_wind_speed_kt = gust_wind_speed;
168 _delta_wind_speed_kt = -0.01;
172 if (_environment != 0)
173 _environment->set_wind_speed_kt(_current_wind_speed_kt);
178 ////////////////////////////////////////////////////////////////////////
179 // Implementation of FGInterpolateEnvironmentCtrl.
180 ////////////////////////////////////////////////////////////////////////
182 FGInterpolateEnvironmentCtrl::FGInterpolateEnvironmentCtrl ()
186 FGInterpolateEnvironmentCtrl::~FGInterpolateEnvironmentCtrl ()
189 for (i = 0; i < _boundary_table.size(); i++)
190 delete _boundary_table[i];
191 for (i = 0; i < _aloft_table.size(); i++)
192 delete _aloft_table[i];
198 FGInterpolateEnvironmentCtrl::init ()
200 read_table(fgGetNode("/environment/config/boundary", true),
202 read_table(fgGetNode("/environment/config/aloft", true),
207 FGInterpolateEnvironmentCtrl::reinit ()
210 for (i = 0; i < _boundary_table.size(); i++)
211 delete _boundary_table[i];
212 for (i = 0; i < _aloft_table.size(); i++)
213 delete _aloft_table[i];
214 _boundary_table.clear();
215 _aloft_table.clear();
220 FGInterpolateEnvironmentCtrl::read_table (const SGPropertyNode * node,
221 vector<bucket *> &table)
223 for (int i = 0; i < node->nChildren(); i++) {
224 const SGPropertyNode * child = node->getChild(i);
225 if ( strcmp(child->getName(), "entry") == 0
226 && child->getStringValue("elevation-ft", "")[0] != '\0'
227 && ( child->getDoubleValue("elevation-ft") > 0.1 || i == 0 ) )
229 bucket * b = new bucket;
231 b->environment.copy(table[i-1]->environment);
232 b->environment.read(child);
233 b->altitude_ft = b->environment.get_elevation_ft();
237 sort(table.begin(), table.end(), bucket::lessThan);
241 FGInterpolateEnvironmentCtrl::update (double delta_time_sec)
244 double altitude_ft = fgGetDouble("/position/altitude-ft");
245 double altitude_agl_ft = fgGetDouble("/position/altitude-agl-ft");
246 double boundary_transition =
247 fgGetDouble("/environment/config/boundary-transition-ft", 500);
249 // double ground_elevation_ft = altitude_ft - altitude_agl_ft;
251 int length = _boundary_table.size();
255 double boundary_limit = _boundary_table[length-1]->altitude_ft;
256 if (boundary_limit >= altitude_agl_ft) {
257 do_interpolate(_boundary_table, altitude_agl_ft,
260 } else if ((boundary_limit + boundary_transition) >= altitude_agl_ft) {
262 do_interpolate(_boundary_table, altitude_agl_ft, &env1);
263 do_interpolate(_aloft_table, altitude_ft, &env2);
265 (altitude_agl_ft - boundary_limit) / boundary_transition;
266 interpolate(&env1, &env2, fraction, _environment);
272 do_interpolate(_aloft_table, altitude_ft, _environment);
276 FGInterpolateEnvironmentCtrl::do_interpolate (vector<bucket *> &table,
278 FGEnvironment * environment)
280 int length = table.size();
284 // Boundary conditions
285 if ((length == 1) || (table[0]->altitude_ft >= altitude_ft)) {
286 environment->copy(table[0]->environment);
288 } else if (table[length-1]->altitude_ft <= altitude_ft) {
289 environment->copy(table[length-1]->environment);
293 // Search the interpolation table
294 for (int i = 0; i < length - 1; i++) {
295 if ((i == length - 1) || (table[i]->altitude_ft <= altitude_ft)) {
296 FGEnvironment * env1 = &(table[i]->environment);
297 FGEnvironment * env2 = &(table[i+1]->environment);
299 if (table[i]->altitude_ft == table[i+1]->altitude_ft)
303 ((altitude_ft - table[i]->altitude_ft) /
304 (table[i+1]->altitude_ft - table[i]->altitude_ft));
305 interpolate(env1, env2, fraction, environment);
313 FGInterpolateEnvironmentCtrl::bucket::operator< (const bucket &b) const
315 return (altitude_ft < b.altitude_ft);
319 FGInterpolateEnvironmentCtrl::bucket::lessThan(bucket *a, bucket *b)
321 return (a->altitude_ft) < (b->altitude_ft);
325 ////////////////////////////////////////////////////////////////////////
326 // Implementation of FGMetarEnvironmentCtrl.
327 ////////////////////////////////////////////////////////////////////////
329 FGMetarEnvironmentCtrl::FGMetarEnvironmentCtrl ()
330 : env( new FGInterpolateEnvironmentCtrl ),
332 metar_loaded( false ),
333 search_interval_sec( 60.0 ), // 1 minute
334 same_station_interval_sec( 900.0 ), // 15 minutes
335 search_elapsed( 9999.0 ),
336 fetch_elapsed( 9999.0 ),
338 proxy_host( fgGetNode("/sim/presets/proxy/host", true) ),
339 proxy_port( fgGetNode("/sim/presets/proxy/port", true) ),
340 proxy_auth( fgGetNode("/sim/presets/proxy/authentication", true) ),
341 metar_max_age( fgGetNode("/environment/params/metar-max-age-min", true) ),
343 // Interpolation constant definitions.
344 EnvironmentUpdatePeriodSec( 0.2 ),
345 MaxWindChangeKtsSec( 0.2 ),
346 MaxVisChangePercentSec( 0.05 ),
347 MaxPressureChangeInHgSec( 0.0033 ),
348 MaxCloudAltitudeChangeFtSec( 20.0 ),
349 MaxCloudThicknessChangeFtSec( 50.0 ),
350 MaxCloudInterpolationHeightFt( 5000.0 ),
351 MaxCloudInterpolationDeltaFt( 4000.0 ),
358 #if defined(ENABLE_THREADS)
359 thread = new MetarThread(this);
360 thread->setProcessorAffinity(1);
362 #endif // ENABLE_THREADS
365 FGMetarEnvironmentCtrl::~FGMetarEnvironmentCtrl ()
367 #if defined(ENABLE_THREADS)
369 #endif // ENABLE_THREADS
376 // use a "command" to set station temp at station elevation
377 static void set_temp_at_altitude( float temp_degc, float altitude_ft ) {
379 SGPropertyNode *node = args.getNode("temp-degc", 0, true);
380 node->setFloatValue( temp_degc );
381 node = args.getNode("altitude-ft", 0, true);
382 node->setFloatValue( altitude_ft );
383 globals->get_commands()->execute("set-outside-air-temp-degc", &args);
387 static void set_dewpoint_at_altitude( float dewpoint_degc, float altitude_ft ) {
389 SGPropertyNode *node = args.getNode("dewpoint-degc", 0, true);
390 node->setFloatValue( dewpoint_degc );
391 node = args.getNode("altitude-ft", 0, true);
392 node->setFloatValue( altitude_ft );
393 globals->get_commands()->execute("set-dewpoint-temp-degc", &args);
398 FGMetarEnvironmentCtrl::update_env_config ()
409 // If we aren't in the METAR scenario, don't attempt to interpolate.
410 if (strcmp(fgGetString("/environment/weather-scenario", "METAR"), "METAR")) return;
413 // Generate interpolated values between the METAR and the current
416 // Pick up the METAR wind values and convert them into a vector.
418 double metar_speed = fgGetDouble("/environment/metar/base-wind-speed-kt");
419 double metar_heading = fgGetDouble("/environment/metar/base-wind-range-from");
421 metar[0] = metar_speed * sin((metar_heading / 180.0) * M_PI);
422 metar[1] = metar_speed * cos((metar_heading / 180.0) * M_PI);
424 // Convert the current wind values and convert them into a vector
426 double current_speed =
427 fgGetDouble("/environment/config/boundary/entry/wind-speed-kt");
428 double current_heading = fgGetDouble(
429 "/environment/config/boundary/entry/wind-from-heading-deg");
431 current[0] = current_speed * sin((current_heading / 180.0) * M_PI);
432 current[1] = current_speed * cos((current_heading / 180.0) * M_PI);
434 // Determine the maximum component-wise value that the wind can change.
435 // First we determine the fraction in the X and Y component, then
436 // factor by the maximum wind change.
437 double x = fabs(current[0] - metar[0]);
438 double y = fabs(current[1] - metar[1]);
439 double dx = x / (x + y);
442 double maxdx = dx * MaxWindChangeKtsSec;
443 double maxdy = dy * MaxWindChangeKtsSec;
445 // Interpolate each component separately.
446 current[0] = interpolate_val(current[0], metar[0], maxdx);
447 current[1] = interpolate_val(current[1], metar[1], maxdy);
449 // Now convert back to polar coordinates.
450 if ((current[0] == 0.0) && (current[1] == 0.0)) {
451 // Special case where there is no wind (otherwise atan2 barfs)
453 dir_from = current_heading;
456 // Some real wind to convert back from. Work out the speed
457 // and direction value in degrees.
458 speed = sqrt((current[0] * current[0]) + (current[1] * current[1]));
459 dir_from = (atan2(current[0], current[1]) * 180.0 / M_PI);
461 // Normalize the direction.
465 SG_LOG( SG_GENERAL, SG_DEBUG, "Wind : " << dir_from << "@" << speed);
468 // Now handle the visibility. We convert both visibility values
469 // to X-values, then interpolate from there, then back to real values.
470 // The length_scale is fixed to 1000m, so the visibility changes by
471 // by MaxVisChangePercentSec or 1000m X MaxVisChangePercentSec,
472 // whichever is more.
474 fgGetDouble("/environment/config/boundary/entry/visibility-m");
475 double metarvis = fgGetDouble("/environment/metar/min-visibility-m");
476 double currentxval = log(1000.0 + currentvis);
477 double metarxval = log(1000.0 + metarvis);
479 currentxval = interpolate_val(currentxval, metarxval, MaxVisChangePercentSec);
481 // Now convert back from an X-value to a straightforward visibility.
482 vis = exp(currentxval) - 1000.0;
484 pressure = interpolate_prop(
485 "/environment/config/boundary/entry/pressure-sea-level-inhg",
486 "/environment/metar/pressure-inhg",
487 MaxPressureChangeInHgSec);
489 dir_to = fgGetDouble("/environment/metar/base-wind-range-to");
490 gust = fgGetDouble("/environment/metar/gust-wind-speed-kt");
491 temp = fgGetDouble("/environment/metar/temperature-degc");
492 dewpoint = fgGetDouble("/environment/metar/dewpoint-degc");
494 // Set the cloud layers by interpolating over the METAR versions.
495 SGPropertyNode * clouds = fgGetNode("/environment/metar/clouds");
497 vector<SGPropertyNode_ptr> layers = clouds->getChildren("layer");
498 vector<SGPropertyNode_ptr>::const_iterator layer;
499 vector<SGPropertyNode_ptr>::const_iterator layers_end = layers.end();
501 const char *cl = "/environment/clouds/layer[%i]";
502 double aircraft_alt = fgGetDouble("/position/altitude-ft");
506 for (i = 0, layer = layers.begin(); layer != layers_end; ++layer, i++) {
510 // In the case of clouds, we want to avoid writing if nothing has
511 // changed, as these properties are tied to the renderer and will
512 // cause the clouds to be updated, reseting the texture locations.
514 // We don't interpolate the coverage values as no-matter how we
515 // do it, it will be quite a sudden change of texture. Better to
516 // have a single change than four or five.
517 snprintf(s, 128, cl, i);
518 strncat(s, "/coverage", 128);
519 const char* coverage = (*layer)->getStringValue("coverage", "clear");
520 if (strncmp(fgGetString(s), coverage, 128) != 0)
521 fgSetString(s, coverage);
523 snprintf(s, 128, cl, i);
524 strncat(s, "/elevation-ft", 128);
525 double current_alt = fgGetDouble(s);
526 double required_alt = (*layer)->getDoubleValue("elevation-ft");
528 if (current_alt < -9000 || required_alt < -9000 ||
529 fabs(aircraft_alt - required_alt) > MaxCloudInterpolationHeightFt ||
530 fabs(current_alt - required_alt) > MaxCloudInterpolationDeltaFt) {
531 // We don't interpolate any layers that are
532 // - too far above us to be visible
533 // - too far below us to be visible
534 // - with too large a difference to make interpolation sensible
535 // - to or from -9999 (used as a placeholder)
536 // - any values that are too high above us,
537 snprintf(s, 128, cl, i);
538 strncat(s, "/elevation-ft", 128);
539 if (current_alt != required_alt)
540 fgSetDouble(s, required_alt);
542 snprintf(s, 128, cl, i);
543 strncat(s, "/thickness-ft", 128);
544 if (fgGetDouble(s) != (*layer)->getDoubleValue("thickness-ft"))
545 fgSetDouble(s, (*layer)->getDoubleValue("thickness-ft"));
548 // Interpolate the other values in the usual way
549 if (current_alt != required_alt) {
550 current_alt = interpolate_val(current_alt,
552 MaxCloudAltitudeChangeFtSec);
553 fgSetDouble(s, current_alt);
556 snprintf(s, 128, cl, i);
557 strncat(s, "/thickness-ft", 128);
558 currentval = fgGetDouble(s);
559 requiredval = (*layer)->getDoubleValue("thickness-ft");
561 if (currentval != requiredval) {
562 currentval = interpolate_val(currentval,
564 MaxCloudThicknessChangeFtSec);
565 fgSetDouble(s, currentval);
571 // We haven't already loaded a METAR, so apply it immediately.
572 dir_from = fgGetDouble("/environment/metar/base-wind-range-from");
573 dir_to = fgGetDouble("/environment/metar/base-wind-range-to");
574 speed = fgGetDouble("/environment/metar/base-wind-speed-kt");
575 gust = fgGetDouble("/environment/metar/gust-wind-speed-kt");
576 vis = fgGetDouble("/environment/metar/min-visibility-m");
577 pressure = fgGetDouble("/environment/metar/pressure-inhg");
578 temp = fgGetDouble("/environment/metar/temperature-degc");
579 dewpoint = fgGetDouble("/environment/metar/dewpoint-degc");
581 // Set the cloud layers by copying over the METAR versions.
582 SGPropertyNode * clouds = fgGetNode("/environment/metar/clouds");
584 vector<SGPropertyNode_ptr> layers = clouds->getChildren("layer");
585 vector<SGPropertyNode_ptr>::const_iterator layer;
586 vector<SGPropertyNode_ptr>::const_iterator layers_end = layers.end();
588 const char *cl = "/environment/clouds/layer[%i]";
592 for (i = 0, layer = layers.begin(); layer != layers_end; ++layer, i++) {
593 snprintf(s, 128, cl, i);
594 strncat(s, "/coverage", 128);
595 fgSetString(s, (*layer)->getStringValue("coverage", "clear"));
597 snprintf(s, 128, cl, i);
598 strncat(s, "/elevation-ft", 128);
599 fgSetDouble(s, (*layer)->getDoubleValue("elevation-ft"));
601 snprintf(s, 128, cl, i);
602 strncat(s, "/thickness-ft", 128);
603 fgSetDouble(s, (*layer)->getDoubleValue("thickness-ft"));
605 snprintf(s, 128, cl, i);
606 strncat(s, "/span-m", 128);
607 fgSetDouble(s, 40000.0);
610 // Force an update of the 3D clouds
611 fgSetDouble("/environment/rebuild-layers", 1.0);
614 fgSetupWind(dir_from, dir_to, speed, gust);
615 fgDefaultWeatherValue("visibility-m", vis);
616 set_temp_at_altitude(temp, station_elevation_ft);
617 set_dewpoint_at_altitude(dewpoint, station_elevation_ft);
618 fgDefaultWeatherValue("pressure-sea-level-inhg", pressure);
620 // We've now successfully loaded a METAR into the configuration
624 double FGMetarEnvironmentCtrl::interpolate_prop(const char * currentname,
625 const char * requiredname,
628 double currentval = fgGetDouble(currentname);
629 double requiredval = fgGetDouble(requiredname);
630 return interpolate_val(currentval, requiredval, dt);
633 double FGMetarEnvironmentCtrl::interpolate_val(double currentval,
637 double dval = EnvironmentUpdatePeriodSec * dt;
639 if (fabs(currentval - requiredval) < dval) return requiredval;
640 if (currentval < requiredval) return (currentval + dval);
641 if (currentval > requiredval) return (currentval - dval);
646 FGMetarEnvironmentCtrl::init ()
648 const SGPropertyNode *longitude
649 = fgGetNode( "/position/longitude-deg", true );
650 const SGPropertyNode *latitude
651 = fgGetNode( "/position/latitude-deg", true );
653 metar_loaded = false;
654 bool found_metar = false;
655 long max_age = metar_max_age->getLongValue();
656 // Don't check max age during init so that we don't loop over a lot
657 // of airports metar if there is a problem.
658 // The update() calls will find a correct metar if things went wrong here
659 metar_max_age->setLongValue(0);
661 while ( !found_metar && (_error_count < 3) ) {
662 const FGAirport* a = globals->get_airports()
663 ->search( longitude->getDoubleValue(),
664 latitude->getDoubleValue(),
668 FGMetarResult result = fetch_data( a->getId() );
669 if ( result.m != NULL ) {
670 SG_LOG( SG_GENERAL, SG_INFO, "closest station w/ metar = "
674 search_elapsed = 0.0;
676 update_metar_properties( result.m );
681 // mark as no metar so it doesn't show up in subsequent
683 SG_LOG( SG_GENERAL, SG_INFO, "no metar at metar = "
685 globals->get_airports()->no_metar( a->getId() );
689 metar_max_age->setLongValue(max_age);
693 FGMetarEnvironmentCtrl::reinit ()
697 metar_loaded = false;
703 FGMetarEnvironmentCtrl::update(double delta_time_sec)
706 _dt += delta_time_sec;
707 if (_error_count >= 3)
710 FGMetarResult result;
712 static const SGPropertyNode *longitude
713 = fgGetNode( "/position/longitude-deg", true );
714 static const SGPropertyNode *latitude
715 = fgGetNode( "/position/latitude-deg", true );
716 search_elapsed += delta_time_sec;
717 fetch_elapsed += delta_time_sec;
718 interpolate_elapsed += delta_time_sec;
720 // if time for a new search request, push it onto the request
722 if ( search_elapsed > search_interval_sec ) {
723 const FGAirport* a = globals->get_airports()
724 ->search( longitude->getDoubleValue(),
725 latitude->getDoubleValue(),
729 if ( !last_apt || last_apt->getId() != a->getId()
730 || fetch_elapsed > same_station_interval_sec )
732 SG_LOG( SG_GENERAL, SG_INFO, "closest station w/ metar = "
734 request_queue.push( a->getId() );
737 search_elapsed = 0.0;
740 search_elapsed = 0.0;
741 SG_LOG( SG_GENERAL, SG_INFO, "same station, waiting = "
742 << same_station_interval_sec - fetch_elapsed );
745 SG_LOG( SG_GENERAL, SG_WARN,
746 "Unable to find any airports with metar" );
748 } else if ( interpolate_elapsed > EnvironmentUpdatePeriodSec ) {
749 // Interpolate the current configuration closer to the actual METAR
752 interpolate_elapsed = 0.0;
755 #if !defined(ENABLE_THREADS)
756 // No loader thread running so manually fetch the data
758 while ( !request_queue.empty() ) {
759 id = request_queue.front();
764 SG_LOG( SG_GENERAL, SG_INFO, "inline fetching = " << id );
765 result = fetch_data( id );
766 result_queue.push( result );
768 #endif // ENABLE_THREADS
770 // process any results from the loader.
771 while ( !result_queue.empty() ) {
772 result = result_queue.front();
774 if ( result.m != NULL ) {
775 update_metar_properties( result.m );
780 // mark as no metar so it doesn't show up in subsequent
781 // searches, and signal an immediate re-search.
782 SG_LOG( SG_GENERAL, SG_WARN,
783 "no metar at station = " << result.icao );
784 globals->get_airports()->no_metar( result.icao );
785 search_elapsed = 9999.0;
789 env->update(delta_time_sec);
794 FGMetarEnvironmentCtrl::setEnvironment (FGEnvironment * environment)
796 env->setEnvironment(environment);
800 FGMetarEnvironmentCtrl::fetch_data( const string &icao )
802 FGMetarResult result;
805 // if the last error was more than three seconds ago,
806 // then pretent nothing happened.
815 // fetch station elevation if exists
816 const FGAirport* a = globals->get_airports()->search( icao );
818 station_elevation_ft = a->getElevation();
821 // fetch current metar data
823 string host = proxy_host->getStringValue();
824 string auth = proxy_auth->getStringValue();
825 string port = proxy_port->getStringValue();
826 result.m = new FGMetar( icao, host, port, auth);
828 long max_age = metar_max_age->getLongValue();
829 long age = result.m->getAge_min();
830 if (max_age && age > max_age) {
831 SG_LOG( SG_GENERAL, SG_WARN, "METAR data too old (" << age << " min).");
835 if (++_stale_count > 10) {
837 throw sg_io_exception("More than 10 stale METAR messages in a row."
838 " Check your system time!");
843 } catch (const sg_io_exception& e) {
844 SG_LOG( SG_GENERAL, SG_WARN, "Error fetching live weather data: "
845 << e.getFormattedMessage().c_str() );
846 #if defined(ENABLE_THREADS)
847 if (_error_count++ >= 3) {
848 SG_LOG( SG_GENERAL, SG_WARN, "Stop fetching data permanently.");
863 FGMetarEnvironmentCtrl::update_metar_properties( const FGMetar *m )
869 fgSetString("/environment/metar/real-metar", m->getData());
870 // don't update with real weather when we use a custom weather scenario
871 const char *current_scenario = fgGetString("/environment/weather-scenario", "METAR");
872 if( strcmp(current_scenario, "METAR") && strcmp(current_scenario, "none"))
874 fgSetString("/environment/metar/last-metar", m->getData());
875 fgSetString("/environment/metar/station-id", m->getId());
876 fgSetDouble("/environment/metar/min-visibility-m",
877 m->getMinVisibility().getVisibility_m() );
878 fgSetDouble("/environment/metar/max-visibility-m",
879 m->getMaxVisibility().getVisibility_m() );
881 const SGMetarVisibility *dirvis = m->getDirVisibility();
882 for (i = 0; i < 8; i++, dirvis++) {
883 const char *min = "/environment/metar/visibility[%d]/min-m";
884 const char *max = "/environment/metar/visibility[%d]/max-m";
886 d = dirvis->getVisibility_m();
888 snprintf(s, 128, min, i);
890 snprintf(s, 128, max, i);
894 fgSetInt("/environment/metar/base-wind-range-from",
895 m->getWindRangeFrom() );
896 fgSetInt("/environment/metar/base-wind-range-to",
897 m->getWindRangeTo() );
898 fgSetDouble("/environment/metar/base-wind-speed-kt",
899 m->getWindSpeed_kt() );
900 fgSetDouble("/environment/metar/gust-wind-speed-kt",
901 m->getGustSpeed_kt() );
902 fgSetDouble("/environment/metar/temperature-degc",
903 m->getTemperature_C() );
904 fgSetDouble("/environment/metar/dewpoint-degc",
905 m->getDewpoint_C() );
906 fgSetDouble("/environment/metar/rel-humidity-norm",
907 m->getRelHumidity() );
908 fgSetDouble("/environment/metar/pressure-inhg",
909 m->getPressure_inHg() );
911 vector<SGMetarCloud> cv = m->getClouds();
912 vector<SGMetarCloud>::const_iterator cloud;
914 const char *cl = "/environment/metar/clouds/layer[%i]";
915 for (i = 0, cloud = cv.begin(); cloud != cv.end(); cloud++, i++) {
916 const char *coverage_string[5] =
917 { "clear", "few", "scattered", "broken", "overcast" };
918 const double thickness[5] = { 0, 65, 600,750, 1000};
921 snprintf(s, 128, cl, i);
922 strncat(s, "/coverage", 128);
923 q = cloud->getCoverage();
924 fgSetString(s, coverage_string[q] );
926 snprintf(s, 128, cl, i);
927 strncat(s, "/elevation-ft", 128);
928 fgSetDouble(s, cloud->getAltitude_ft() + station_elevation_ft);
930 snprintf(s, 128, cl, i);
931 strncat(s, "/thickness-ft", 128);
932 fgSetDouble(s, thickness[q]);
934 snprintf(s, 128, cl, i);
935 strncat(s, "/span-m", 128);
936 fgSetDouble(s, 40000.0);
939 for (; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
940 snprintf(s, 128, cl, i);
941 strncat(s, "/coverage", 128);
942 fgSetString(s, "clear");
944 snprintf(s, 128, cl, i);
945 strncat(s, "/elevation-ft", 128);
946 fgSetDouble(s, -9999);
948 snprintf(s, 128, cl, i);
949 strncat(s, "/thickness-ft", 128);
952 snprintf(s, 128, cl, i);
953 strncat(s, "/span-m", 128);
954 fgSetDouble(s, 40000.0);
957 fgSetDouble("/environment/metar/rain-norm", m->getRain());
958 fgSetDouble("/environment/metar/hail-norm", m->getHail());
959 fgSetDouble("/environment/metar/snow-norm", m->getSnow());
960 fgSetBool("/environment/metar/snow-cover", m->getSnowCover());
964 #if defined(ENABLE_THREADS)
966 FGMetarEnvironmentCtrl::thread_stop()
968 request_queue.push( string() ); // ask thread to terminate
973 FGMetarEnvironmentCtrl::MetarThread::run()
977 string icao = fetcher->request_queue.pop();
980 SG_LOG( SG_GENERAL, SG_INFO, "Thread: fetch metar data = " << icao );
981 FGMetarResult result = fetcher->fetch_data( icao );
982 fetcher->result_queue.push( result );
985 #endif // ENABLE_THREADS
988 // end of environment_ctrl.cxx