Package org.orekit.models.earth
Class EarthStandardAtmosphereRefraction
- java.lang.Object
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- org.orekit.models.earth.EarthStandardAtmosphereRefraction
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- All Implemented Interfaces:
Serializable
,AtmosphericRefractionModel
public class EarthStandardAtmosphereRefraction extends Object implements AtmosphericRefractionModel
Implementation of refraction model for Earth standard atmosphere.Refraction angle is 0 at zenith, about 1 arcminute at 45°, and 34 arcminutes at the horizon for optical wavelengths.
Refraction angle is computed according to Saemundssen formula quoted by Meeus. For reference, see Astronomical Algorithms (1998), 2nd ed, (ISBN 0-943396-61-1), chap. 15.
This formula is about 30 arcseconds of accuracy very close to the horizon, as variable atmospheric effects become very important.
Local pressure and temperature can be set to correct refraction at the viewpoint.
- Since:
- 6.1
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description static double
DEFAULT_CORRECTION_FACTOR
Default correction factor value.static double
DEFAULT_PRESSURE
Default local pressure at viewpoint (Pa).static double
DEFAULT_TEMPERATURE
Default local temperature at viewpoint (K).static double
STANDARD_ATM_PRESSURE
NIST standard atmospheric pressure (Pa).static double
STANDARD_ATM_TEMPERATURE
NIST standard atmospheric temperature (K).
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Constructor Summary
Constructors Constructor Description EarthStandardAtmosphereRefraction()
Creates a new default instance.EarthStandardAtmosphereRefraction(double pressure, double temperature)
Creates an instance given a specific pressure and temperature.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description double
getPressure()
Get the local pressure at the evaluation location.double
getRefraction(double trueElevation)
Compute the refraction angle from the true (geometrical) elevation.double
getTemperature()
Get the local temperature at the evaluation location.void
setPressure(double pressure)
Set the local pressure at the evaluation locationvoid
setTemperature(double temperature)
Set the local temperature at the evaluation location
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Field Detail
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DEFAULT_CORRECTION_FACTOR
public static final double DEFAULT_CORRECTION_FACTOR
Default correction factor value.- See Also:
- Constant Field Values
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DEFAULT_PRESSURE
public static final double DEFAULT_PRESSURE
Default local pressure at viewpoint (Pa).- See Also:
- Constant Field Values
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DEFAULT_TEMPERATURE
public static final double DEFAULT_TEMPERATURE
Default local temperature at viewpoint (K).- See Also:
- Constant Field Values
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STANDARD_ATM_PRESSURE
public static final double STANDARD_ATM_PRESSURE
NIST standard atmospheric pressure (Pa).- See Also:
- Constant Field Values
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STANDARD_ATM_TEMPERATURE
public static final double STANDARD_ATM_TEMPERATURE
NIST standard atmospheric temperature (K).- See Also:
- Constant Field Values
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Constructor Detail
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EarthStandardAtmosphereRefraction
public EarthStandardAtmosphereRefraction()
Creates a new default instance.
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EarthStandardAtmosphereRefraction
public EarthStandardAtmosphereRefraction(double pressure, double temperature)
Creates an instance given a specific pressure and temperature.- Parameters:
pressure
- in Pascals (Pa)temperature
- in Kelvin (K)
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Method Detail
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getPressure
public double getPressure()
Get the local pressure at the evaluation location.- Returns:
- the pressure (Pa)
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setPressure
public void setPressure(double pressure)
Set the local pressure at the evaluation locationOtherwise the default value for the local pressure is set to
DEFAULT_PRESSURE
.- Parameters:
pressure
- the pressure to set (Pa)
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getTemperature
public double getTemperature()
Get the local temperature at the evaluation location.- Returns:
- the temperature (K)
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setTemperature
public void setTemperature(double temperature)
Set the local temperature at the evaluation locationOtherwise the default value for the local temperature is set to
DEFAULT_TEMPERATURE
.- Parameters:
temperature
- the temperature to set (K)
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getRefraction
public double getRefraction(double trueElevation)
Description copied from interface:AtmosphericRefractionModel
Compute the refraction angle from the true (geometrical) elevation.- Specified by:
getRefraction
in interfaceAtmosphericRefractionModel
- Parameters:
trueElevation
- true elevation (rad)- Returns:
- refraction angle (rad)
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