Practical Uses and Benefits of GPS for GeodeticControl in Tennessee Department of Transportation

James R. Garrett, James H. Waters, James R. Shoemaker, S. Hubert Garland

Abstract:	The Tennessee Department of Transportation has been performing control surveys using GPS methods since 1989. Starting about 1994, we realized the need to expand the use in order to realize greater efficiency. We hoped to gain the following by expanded use of GPS methods: 1. Eliminate or reduce the use of separate vertical control processes. 2. Increase the number of horizontal and vertical control points placed on each project. 3. Eliminate or greatly reduce the need for control traversing using total station instruments by route survey crews. 4. Adopt GPS methods for aerial surveys photo control. 5. Consolidate all vertical and horizontal control work into designated geodetic control survey parties. 6. Reduce the manpower required in establishing project control and photo ground control. 7. Drastically reduce the number times a traverse must be re-occupied due to traversing errors.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	921 - 926
Cite this article:	Garrett, James R., Waters, James H., Shoemaker, James R., Garland, S. Hubert, "Practical Uses and Benefits of GPS for GeodeticControl in Tennessee Department of Transportation," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 921-926.
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