The Impact of Different Mapping Function Models and Meteorological Parameter Calculation Methods on the Calculation Results of Single-Frequency Precise Point Positioning with Increased Tropospheric Gradient

Table 2

The properties of different methods for obtaining meteorological parameter.

Methods	Reference	Spatial resolution	Input parameters	Output parameters
GPT	Boehm et al. [4]	15°
GPT2	Lagler et al. [5]
GPT2w	Boehm et al. [7]
GPT3	Landskron and Bohm [18]

is the pressure; is the temperature; is the geoid undulation; is the temperature lapse rate; is the water vapor pressure; and are the hydrostatic and wet mapping function coefficients at zero height, respectively; is the mean temperature of the water vapor; is the water vapor decrease factor; and are the hydrostatic north and east gradients, respectively; and and are the wet north and east gradients, respectively.