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+// environment.hxx -- routines to model the natural environment.
+//
+// Written by David Megginson, started February 2002.
+//
+// Copyright (C) 2002  David Megginson - david@megginson.com
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#ifndef _ENVIRONMENT_HXX
+#define _ENVIRONMENT_HXX
+
+#include <simgear/compiler.h>
+
+#include <cmath>
+#include <simgear/props/tiedpropertylist.hxx>
+
+/**
+ * Model the natural environment.
+ *
+ * This class models the natural environment at a specific place and
+ * time.  A separate instance is necessary for each location or time.
+ *
+ * This class should eventually move to SimGear.
+ */
+class FGEnvironment
+{
+
+public:
+
+  FGEnvironment();
+  FGEnvironment (const FGEnvironment &environment);
+  virtual ~FGEnvironment();
+
+  FGEnvironment & operator = ( const FGEnvironment & other );
+
+  virtual void read (const SGPropertyNode * node);
+  virtual void Tie( SGPropertyNode_ptr base, bool setArchivable = true );
+  virtual void Untie();
+  
+  virtual double get_visibility_m () const;
+
+  virtual double get_temperature_sea_level_degc () const;
+  virtual double get_temperature_degc () const;
+  virtual double get_temperature_degf () const;
+  virtual double get_dewpoint_sea_level_degc () const;
+  virtual double get_dewpoint_degc () const;
+  virtual double get_pressure_sea_level_inhg () const;
+  virtual double get_pressure_inhg () const;
+  virtual double get_density_slugft3 () const;
+
+  virtual double get_relative_humidity () const;
+  virtual double get_density_tropo_avg_kgm3 () const;
+  virtual double get_altitude_half_to_sun_m () const;
+  virtual double get_altitude_tropo_top_m () const;
+
+  virtual double get_wind_from_heading_deg () const;
+  virtual double get_wind_speed_kt () const;
+  virtual double get_wind_from_north_fps () const;
+  virtual double get_wind_from_east_fps () const;
+  virtual double get_wind_from_down_fps () const;
+
+  virtual double get_turbulence_magnitude_norm () const;
+  virtual double get_turbulence_rate_hz () const;
+
+  virtual void set_visibility_m (double v);
+
+  virtual void set_temperature_sea_level_degc (double t);
+  virtual void set_temperature_degc (double t);
+  virtual void set_dewpoint_sea_level_degc (double d);
+  virtual void set_dewpoint_degc (double d);
+  virtual void set_pressure_sea_level_inhg (double p);
+  virtual void set_pressure_inhg (double p);
+
+  virtual void set_wind_from_heading_deg (double h);
+  virtual void set_wind_speed_kt (double s);
+  virtual void set_wind_from_north_fps (double n);
+  virtual void set_wind_from_east_fps (double e);
+  virtual void set_wind_from_down_fps (double d);
+
+  virtual void set_turbulence_magnitude_norm (double t);
+  virtual void set_turbulence_rate_hz (double t);
+
+  virtual double get_elevation_ft () const;
+  virtual void set_elevation_ft (double elevation_ft);
+  virtual void set_altitude_half_to_sun_m (double alt);
+  virtual void set_altitude_tropo_top_m (double alt);
+
+  virtual bool set_live_update(bool live_update);
+
+
+  FGEnvironment & interpolate (const FGEnvironment & env2, double fraction, FGEnvironment * result) const;
+private:
+  virtual void copy (const FGEnvironment &environment);
+  void _init();
+  void _recalc_hdgspd ();
+
+  void _recalc_sl_temperature ();
+  void _recalc_sl_dewpoint ();
+  void _recalc_sl_pressure ();
+
+  void _recalc_density_tropo_avg_kgm3 ();
+  void _recalc_ne ();
+  void _recalc_alt_dewpoint ();
+  void _recalc_density ();
+  void _recalc_relative_humidity ();
+  void _recalc_alt_pt ();
+
+  double elevation_ft;
+  double visibility_m;
+
+  // Atmosphere
+  double temperature_sea_level_degc;
+  double temperature_degc;
+  double dewpoint_sea_level_degc;
+  double dewpoint_degc;
+  double pressure_sea_level_inhg;
+  double pressure_inhg;
+  double density_slugft3;
+
+  double density_tropo_avg_kgm3;
+  double relative_humidity;
+  double altitude_half_to_sun_m;
+  double altitude_tropo_top_m;
+
+  double turbulence_magnitude_norm;
+  double turbulence_rate_hz;
+
+  double wind_from_heading_deg;
+  double wind_speed_kt;
+
+  double wind_from_north_fps;
+  double wind_from_east_fps;
+  double wind_from_down_fps;
+
+  bool     live_update;
+  simgear::TiedPropertyList _tiedProperties;
+
+};
+
+#endif // _ENVIRONMENT_HXX