The precise leveling network consists of a set of permanently stabilized and easily accessible benchmarks. Working benchmarks are classified as main and auxiliary. They are distributed at a distance of less than 1.5 km in the form of leveling lines. Heights of precision leveling network benchmarks were used to create a residuals grid implemented in the official RGA web application GRIDER for conversion of this height datum to the NVT2 system due to the different origin network of fiducial tide gauges used for data adjustment (Tide gauge in the Trieste - Tide gauge in the Bar).
Network leveling is conducted during the period from 1905 until the 1930 year.The geodetic datum of the precise leveling network is defined by the absolute height of the tide gauge located in Trieste.The approximate distance between benchmarks is 1km.The total number of benchmarks is 11724.
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