Seasonal Multifactor Modelling of Weighted-Mean Temperature for Ground-Based GNSS Meteorology in Hunan, China

Table 1

Comparison of four typical methods for obtaining .

Method	Formula	Factors	Difficulty	Accuracy
Numerical integration		Vapor pressure ; average temperature ; thickness	Hard	Highest
Bevis		Surface temperature Ts	Easy	High
Constant	K	—	Easiest	Lowest
Approximate integration		Temperature lapse rate ; vapor pressure decline rate ; surface temperature ; gas constant ; gravitational acceleration	Hardest	Low