page_title: Geodetic control network
hierarchical_section_title: Geodetic control network
caption_attribution_description: English: This is the station mark for station MY4112--PROSPECT HINGHAM, located at the peak of Prospect Hill in Wompatuck State park, Hingham, MA. This is a brass disk, about 3.5 in. in diameter. The triangle indicates that this is a station mark, and the small dot at its center indicates the precise location of the station. The disk has been recessed into a depression chiseled into a rock ledge. The original station mark (a copper bolt) was set in 1834, and was reset with this more modern disk in 1933.
context_page_description: A geodetic control network is a network, often of triangles, which are measured precisely by techniques of terrestrial surveying or by satellite geodesy.
  A geodetic control network consists of stable, identifiable points with published datum values derived from observations that tie the points together.
  Classically, a control is divided into horizontal and vertical controls, however with the advent of satellite navigation systems, GPS in particular, this division is becoming obsolete.
  Many organizations contribute information to the geodetic control network.
  The higher-order control points are normally defined in both space and time using global or space techniques, and are used for "lower-order" points to be tied into. The lower-order control points are normally used for engineering, construction and navigation. The scientific discipline that deals with the establishing of coordinates of points in a high-order control network is called geodesy, and the technical discipline that does the same for points in a low-order control network is called surveying.
context_section_description: A geodetic control network (also geodetic network, reference network, control point network, or control network) is a network, often of triangles, which are measured precisely by techniques of terrestrial surveying or by satellite geodesy.
  A geodetic control network consists of stable, identifiable points with published datum values derived from observations that tie the points together.
  Classically, a control is divided into horizontal (X-Y) and vertical (Z) controls (components of the control), however with the advent of satellite navigation systems, GPS in particular, this division is becoming obsolete.
  Many organizations contribute information to the geodetic control network.
  The higher-order (high precision, usually millimeter-to-decimeter on a scale of continents) control points are normally defined in both space and time using global or space techniques, and are used for "lower-order" points to be tied into. The lower-order control points are normally used for engineering, construction and navigation. The scientific discipline that deals with the establishing of coordinates of points in a high-order control network is called geodesy, and the technical discipline that does the same for points in a low-order control network is called surveying.
caption: Control point marker placed by the US Coast and Geodetic Survey
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