control network that consist of stable, identifiable points with published datum values derived from observations that tie the points together, põhivõrk, mis koosneb stabiilsetest, identifitseeritavatest seotud tugipunktidest, millede tugiväärtused on tuletatud mõõdistamise tulemusel, network, often of triangles, which are measured precisely by techniques of control surveying, such as terrestrial surveying or satellite geodesy