Three-Dimensional Densification for Local Control

by Narendra K. Saxena, (M.ASCE), Asst. Prof.; Dept. of Civ. Engrg., Univ. of Illinois, Urbana, Ill.,
Alan P. Vonderohe, Grad. Student; Dept. of Civ. Engrg., Univ. of Illinois, Urbana, Ill.,

Serial Information: Journal of the Surveying and Mapping Division, 1978, Vol. 104, Issue 1, Pg. 63-77

Document Type: Journal Paper


In recent years local engineers and surveyors have often asked for precisely determined control points at a spacing of 2-km to 3-km. To fulfill this demand, a study is being conducted at the Univ. of Illinois at Urbana so as to densify the existing first-order geodetic control. Considered for this study are various configurations and electronic instrumentation that will provide a method for rapid field work, thus reducing the total project cost tremendously without reducing the desired high accuracy. Results of a new configuration, called the Central-Point Configuration, are more accurate than desired, both for horizontal and vertical control. This study will be of importance to all states and counties that need to establish a densified control net of higher accuracy with limited funds.

Subject Headings: Field tests | Spacing | Urban areas | Geodetic surveys | Instrumentation | Construction costs | Illinois | United States

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