Code |
Reference |
Impute parameters |
ε_{min}˚ |
---|---|---|---|

SA |
Saastamoinen (1987) |
z, T_{0}, e_{o} |
10˚ |

HO |
Hopfield (1971) |
ε, T_{0}, e_{o} |
** |

BL |
Black (1978) |
ε, T_{0}, e_{o}, r |
5˚ |

CH |
Chao (1972) |
ε |
10˚ |

IF |
Ifadis (1986) |
ε, t_{0}, e_{o}, P_{0} |
2˚ |

HE |
Herring (1992) |
ε, t_{0}, φ, H_{o} |
3˚ |

NI |
Niell (1993) |
ε, φ |
3˚ |

MO |
Moffett (1973) |
ε |
2˚ |

B & E |
Black and Eisner (1984) |
ε |
7˚ |

UNBabc |
Gue J. and Langley R. (2003), |
ε, φ, H_{0} |
2˚ |

where: *φ* is the station latitude, *H* is the station height, *r* is the effective radius of the station, *T*_{0} is the temperature at site in K˚, *t*_{0} is the temperature at site in ˚C, *e*_{0} is the partial water vapor pressure in (mb), z is the zenith angle and *ε* is the elevation angle. ****** Means that**:** not specified or valid for any elevation angle.