The sources and properties of the mistakes of the light-distantal measurings were characterized at this artiele; the classification and corresponding grouping of them also were made. The formulas for calculation the waiting exactness of the lightdistantal measurings were taken out. These findings give us a passibility to carry out with high-quality the exact calculations for geodesical monitoring of the horizontal motions of the earthy surface and the buildings at the Atomic Pover Station.
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