The national trigonometric network consists of a set of permanently stabilized reference points which are spatially classified into two main and two additional clusters according to the fundamental geodetic network hierarchy. Trigonometric points are distributed evenly around the Serbian territory with an average distance of 4 km approximately. Control GPS measurements of geocentric WGS84 coordinates were performed on a selected set of reliable archive trigonometric points, which were used to create the official horizontal transformation model of the Republic of Serbia. The mentioned mathematical model is available in the RGA's GRIDER web application for performing the conversion of spatial coordinates into the map projection plane (GK7 and UTM34N) using Helmert's seven-parameter similarity transformation and bilinear interpolation from the estimated horizontal residuals national grid.
The trigonometric network was developed in the period from 1900 to 1950. Geodetic measurements in the network were made using triangulation and trilateration methods. The points' horizontal coordinates and orthometric heights were calculated using classic trigonometric methods based on the measured distances and angles. This network has not been maintained officially since 1970. There is no reliable data on the exact number of destroyed points.
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