GPT.hpp File Reference

GPT2/3 (Global Pressure and Temperature) models. More...

Go to the source code of this file.

Classes
struct	NAV::GPT2output
	GPT2 output parameters. More...
struct	NAV::GPT3output
	GPT3 output parameters. More...

Functions
double	NAV::asknewet (const double &e, const double &Tm, const double &la)
	This subroutine determines the zenith wet delay.
GPT2output	NAV::GPT2_param (const double &mjd, const Eigen::Vector3d &lla_pos)
	Determine pressure, temperature, temperature lapse rate, mean temperature of the water vapor, water vapor pressure, hydrostatic and wet mapping function coefficients ah and aw, water vapour decrease factor and geoid undulation for specific sites near the Earth surface, based on a 1 x 1 degree GPT2 grid.
GPT3output	NAV::GPT3_param (const double &mjd, const Eigen::Vector3d &lla_pos)
	Determine pressure, temperature, temperature lapse rate, mean temperature of the water vapor, water vapour pressure, hydrostatic and wet mapping function coefficients ah and aw, water vapour decrease factor, geoid undulation and empirical tropospheric gradients for specific sites near the earth's surface, based on a 1 x 1 degree GPT3 grid.
double	NAV::mjd2doy (const double &mjd)
	To calculate the day of year.

Detailed Description

GPT2/3 (Global Pressure and Temperature) models.

Author

Rui Wang (rui.w.nosp@m.ang@.nosp@m.ins.u.nosp@m.ni-s.nosp@m.tuttg.nosp@m.art..nosp@m.de)

T. Topp (topp@.nosp@m.ins..nosp@m.uni-s.nosp@m.tutt.nosp@m.gart..nosp@m.de)

Date

2023-02-22

Note

See https://vmf.geo.tuwien.ac.at/codes/ for code sources in matlab.

Function Documentation

asknewet()

double NAV::asknewet	(	const double &	e,
		const double &	Tm,
		const double &	la )

This subroutine determines the zenith wet delay.

Parameters

[in]	e	water vapor pressure in hPa
[in]	Tm	mean temperature in Kelvin
[in]	la	water vapor lapse rate (see definition in Askne and Nordius 1987)

Returns

zwd: zenith wet delay in meter

Note

See [3] Aske and Nordius (1987), eq. 22

GPT2_param()

GPT2output NAV::GPT2_param	(	const double &	mjd,
		const Eigen::Vector3d &	lla_pos )

Determine pressure, temperature, temperature lapse rate, mean temperature of the water vapor, water vapor pressure, hydrostatic and wet mapping function coefficients ah and aw, water vapour decrease factor and geoid undulation for specific sites near the Earth surface, based on a 1 x 1 degree GPT2 grid.

Parameters

[in]	mjd	modified Julian date
[in]	lla_pos	[𝜙, λ, h]^T Geodetic latitude, longitude and height in [rad, rad, m]

Note

See [9] Böhm2015

GPT3_param()

GPT3output NAV::GPT3_param	(	const double &	mjd,
		const Eigen::Vector3d &	lla_pos )

Determine pressure, temperature, temperature lapse rate, mean temperature of the water vapor, water vapour pressure, hydrostatic and wet mapping function coefficients ah and aw, water vapour decrease factor, geoid undulation and empirical tropospheric gradients for specific sites near the earth's surface, based on a 1 x 1 degree GPT3 grid.

Parameters

[in]	mjd	modified Julian date
[in]	lla_pos	[𝜙, λ, h]^T Geodetic latitude, longitude and height in [rad, rad, m]

Note

See [27] Landskron2018

mjd2doy()

double NAV::mjd2doy

(

const double &

mjd

)

To calculate the day of year.

Parameters

[in]

mjd

the Modified Julien Date

Returns

the day of year