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The precise levelling network consists of a set of permanently marked and easily accessible fundamental benchmarks. Temporary benchmarks can be main and supporting. They represent the points distributed at the distance less than 1.5 km in the form of levelling lines between the fundamental benchmarks.
The trigonometric network consists of a set of points permanently marked and classified in two main and two additional orders according to hierarchy. Points are distributed evenly around country with average distance of 4 km.
Buildings and other construction objects from the digital cadastral plan as separate parts of plots.