Welcome to the Geodetic Control Diagrams Map. This provides a map with links to all of the historic Geodetic Control Diagram pdfs for view or download. If for some reason a PDF does not load in the browser right click the PDF button and select "Save Link as .." to download to your computer.
These historic maps come from a time before surveying with Global Positioning Systems (GPS) satellites and display observations using traditional surveying methods such as line of sight, triangulation, traverse, trilateration and geodetic leveling. These diagrams are provided for historical reference and not for use in surverying today. For current geodetic control information please visit the NGS Data Explorer.
For more information visit: Geodetic Control Diagrams
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