It is discussed in this paper that if the reference atmosphere and the law of atmospheric mass conservation are introduced in the spectral model of National Climate Center.

In this paper, What is generalized is the use of reference atmosphere spectral model computational scheme (or hydrostatic extension scheme) in medium-range numerical weather prediction, post-processing and data-assimilation, and long-range climate simulation in some meteorological organism at home and abroad.

The paper put forward ways to obtain constants (include the atmospheric reference state and the wavelength of the laser) of distance surveying part of the ETS (electronic total station) or EDM (electro-optical distance meter) by the atmospheric correction formula (that is the multiplicative constant correction or ppm value) of ETS or EDM.