Control Survey

CONTROL SURVEYS provide “basic con- trol” or horizontal and vertical positions of points to which supplementary surveys are adjusted. These types of surveys :

• Sometimestermed geodetic surveys) are conducted to provide geographic
• positions and plane coordinates of triangulation and traverse stations and the elevations of bench marks.
• These control points are further used as references for hydrographic surveys of the coastal waters; for topographic control; and for the control of many state, city, and private surveys.