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  • Static OPUS Control Points

    Send questions, comments or data problems to Andrew Iler.

    The National Geodetic Survey's Online Positioning User Service (OPUS) provides access to high-accuracy National Spatial Reference System (NSRS) coordinates. Pima County uploads GPS data and OPUS returns NSRS positions as "OPUS Solutions".

    Pima County Static OPUS Solution Control Points are random points proximal to section corners. This page displays the survey section OPUS Control Points Map and each control point's occupation sheet and OPUS Solution Report.

    All horizontal data is based on static observations of two or more hours. OPUS solution reports represent the results of the said observations. These control points are, at best, third order and are not a horizontal control point as defined by ARS 33-133. A monument existed at the time the "OPUS" solution position was determined. The monument that existed was in the proximity of, and is NOT an aliquot corner as described in the Public Land Survey System, although OPUS Control Point identifiers name reference section corner numbers as defined by this township corner chart. The OPUS Solution Reports were acquired via the National Geodetic Survey's Online Positioning User Service (OPUS).

    You can view the OPUS Control Point information two ways.

    OPUS Control Points MapGuide Map 

    OPUS Control Points Map

    OPUS Control Point Document Search

    To learn about options, queries, and viewing documents, see OnBase, Document Management System Help or contact Tom Reu.  When viewing a control point document, you can click on the "MAP" button to zoom to that document's point on MapGuide.

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    Ana M. Olivares, P.E.

    201 N. Stone Ave., 4th Fl.
    Tucson, AZ 85701

    (520) 724-6410

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