Alaska Geospatial Council (AGC)

Geodetic Control

Geodetic control allows accurate horizontal and vertical positioning of overlaying datasets, including elevation. Geodetic control provides the framework for all positioning and mapping activities in Alaska, including the accurate horizontal and vertical positioning of geospatial datasets. The foundational elements of geodetic control are latitude, longitude, elevation, and their changes over time. Geodetic positions may be accessed via passive control (survey monuments) or via active GNSS/GPS-based control (in the form of Continuously Operating Reference Stations, or CORS) combined with an accurate model of the earth's gravity potential (provided by the GRAV-D project). Sound geodetic control contributes to informed decision-making and impacts a wide range of important activities including mapping and charting, navigation, flood risk determination, transportation, land use and ecosystem management.

Shared geodetic control documents can be accessed through Google Docs.

Geodetic Control Technical Working Group CharterPDF document140 Kb