Package org.orekit.models.earth

Class GlobalPressureTemperatureModel

java.lang.Object

org.orekit.models.earth.GlobalPressureTemperatureModel

All Implemented Interfaces:

WeatherModel

public class GlobalPressureTemperatureModel
extends Object
implements WeatherModel

The Global Pressure and Temperature model. This model is an empirical model that provides the temperature and the pressure depending the latitude and the longitude of the station.

The Global Pressure and Temperature model is based on spherical harmonics up to degree and order of 9. The residual values of this model can reach 20 hPa for pressure and 10 ° C for temperature. They are significant for higher latitudes and small near the equator (Böhm, 2007)

Author:

Bryan Cazabonne

Constructor Summary

Constructors

Constructor	Description
GlobalPressureTemperatureModel(double latitude, double longitude, Frame bodyFrame)	Build a new instance.

Method Summary

Modifier and Type	Method	Description
double	getPressure()	Get the atmospheric pressure of the station depending its position.
double	getTemperature()	Get the atmospheric temperature of the station depending its position.
void	weatherParameters(double height, AbsoluteDate date)	Calculates the weather parameters of the model.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GlobalPressureTemperatureModel

public GlobalPressureTemperatureModel(double latitude,
                                      double longitude,
                                      Frame bodyFrame)

Build a new instance.

At the initialization the values of the pressure and the temperature are set to NaN. The user has to call weatherParameters(double, AbsoluteDate) method before using the values of the pressure and the temperature.

Parameters:

latitude - geodetic latitude, in radians

longitude - geodetic longitude, in radians

bodyFrame - the frame to attach to the ellipsoid. The origin is at the center of mass, the z axis is the minor axis.

Method Detail

getTemperature

public double getTemperature()

Get the atmospheric temperature of the station depending its position.

Returns:

the temperature in kelvins

getPressure

public double getPressure()

Get the atmospheric pressure of the station depending its position.

Returns:

the pressure in hPa

weatherParameters

public void weatherParameters(double height,
                              AbsoluteDate date)

Description copied from interface: WeatherModel

Calculates the weather parameters of the model. In order to obtain the correct values of the parameters this method has to be call just after the construction of the model.

Specified by:

weatherParameters in interface WeatherModel

Parameters:

height - the height of the station in m

date - current date