Atmospheric Distribution Model

Atmospheric vertical distributions and high altitude surveying techniques are described briefly. The reason why the atmospheric spherically symmetric distribution models are only adopted at present is analyzed. It is demonstrated that astronomical refraction measured models varied with change in observing stations and observation directions already have characteristics of non-spherically symmetric distribution of the real atmosphere over the observing stations so that there is no need to find or build atmospheric distribution models varied with change in topography and seasons. With the measured models, influences of ill selection of atmospheric distribution models can be avoided. All these from one side will ensure success in improving accuracies of the astronomical refraction correction and the radio wave refraction delay correction.