Evaluation of Wet Mapping Functions Used in Modeling Tropospheric Propagation Delay Effect on GPS Measurements

Table 1: Coefficients of the Niell wet mapping function.

Coefficients	ɸ = 15˚	ɸ = 30˚	ɸ = 45˚	ɸ = 60˚	ɸ = 75˚
a	5.8021897e^-4	5.6794847e^-4	5.8118019e^-4	5.9727542e^-4	6.1641693e^-4
b	1.4275268e^-3	1.5138625e^-3	1.4572752e^-3	1.5007428e^-3	1.7599082e^-3
c	4.3472961e^-2	4.6729510e^-2	4.3908931e^-2	4.4626982e^-2	5.4736038e^-2