Pima County DOT - City of Tucson DOT

Geodetic Control Points

Point 13S, 15E, X15

Overview This page displays information about geodetic control points developed by the Pima County Department of Transportation and the City of Tucson Department of Transportation. Control points are displayed on an interactive MapGuide map and are linked to point attributes and scanned images of descriptive occupation sheets for each point. For vertical control, see NAVD88 Elevation Circuit. You can view the Geodetic Control Point layer along with others online. Customize your online map viewing while seamlessly panning and zooming data layers of your choice in addition to the Geodetic Control Point data. A TIFF image viewer enables you to view the scanned descriptive data sheets.

To view the Geodetic Control Point data:

• Read the Pima County DOT Disclaimer as well as the following disclaimer specific to the geodetic control points:

  These geodetic control points are, at best, third order and are not horizontal control points as defined by ARS 33-133. Monuments existed at the time their geodetic position was determined. The monuments that existed may have been in the proximity of, or may in fact have been, aliquot corners, or section corners. The survey which determined the geodetic positions was for the purpose of controlling the City of Tucson and Pima Association of Governments Orthophoto Project, not for determining whether the monuments represented aliquot corners, or section corners nor to establish horizontal control.

• Read Using Autodesk MapGuide.
• Be sure you have a TIFF image viewer to view the scanned documents.
• Read things you need to know to view the data, like double-clicking on geodetic control points and how to navigate in two browser windows.
• Be ready to zoom in to your area of interest.
• Go to the map:

  Geodetic Control Points Map

Without using the map, you can

• Show attributes and GPS Occupation Sheets for one control point by selecting its township and index code, National Geodetic Survey (NGS) point, or Other Monument type sequence number.
• See the list of occupation sheets for each control point.
• See Support Information and Glossary.

• For issues related to data content or if you observe any significant discrepancy between an existing Geodetic Control Point and its published location or condition, please contact John Gentry at 791-5100 or .
• For issues related to this web application, contact .