The main Object of Geodetic Survey is the determination of precise position of different widely distant points on the surface of the earth.
Those points are referred to as control stations which are located through Geodetic Survey are used as reference point in other
surveys like engineering Survey, topographical, cadastral, etc.,
Such surveys are conducted only by the agencies of the Governments.
Just to add, surveys give measurements which are important in making maps and charts. They give information such as distance, depth, and volume. Because the measurements must be specific, it would make a difference if the tools used are accurate.