Geographic Information Framework Data Content Standard, Part 4: Geodetic Control

 

Geodetic control surveys are usually performed to establish the basic positional framework from which supplemental surveying and mapping are performed. Geodetic control surveys are distinguished by use of redundant, interconnected, permanently monumented control points that comprise the National Spatial Reference System (NSRS) or are often incorporated into NSRS. Geodetic control surveys are performed to far more rigorous accuracy and quality assurance standards than those for local control surveys for general engineering, construction, or topographic mapping purposes. Geodetic control surveys included in NSRS meet automated data recording, submittal, project review, and least squares adjustment requirements established by the Federal Geodetic Control Subcommittee (FGCS). 

This document provides a common methodology for creating datasets of horizontal coordinate values and vertical coordinate values for geodetic control points represented by survey monuments, such as brass disks and rod marks. It provides a single data structure for relating coordinate values obtained by one geodetic survey method (for example, a classical line-of-sight traverse) with coordinate values obtained by another geodetic survey method (for example, a Global Positioning System geodetic control survey).