Refinements of the GPS/Photogrammetric Surveying Capability in the Texas State Department of Highways and Public Transportation

Roger L. Merrell, Harnek S. Bains, Mark P. Leach, Duane J. Kurtin, James R. Lucas

Abstract:	The Texas State Department of Highways and Public Transportation (TSDHPT), Applied Research Laboratories, The University of Texas at Austin (ARL:UT), and National Geodetic Survey have cooperated in an ongoing project to develoo an operational airborne GPS positioning system to support photogrammetric mapping. .Efforts have been concentrated on the practical aspects of developing a production oriented GPS/photogrammetric capability. The results are based on several test projects conducted by the TSDHPT. The tests used different combinations of aircraft, aerial cameras, GPS receivers, event time measurement schemes, and project sites. Results indicate that a 4 cm or better accuracies are consistently obtainable. This paper discusses the flight tests that have been flown to date and includes the results from various GPS receivers, namely ASHTECH, TRIMBLE, T14100, and MOTOROLA EAGLE. The discussion highlights the systematic errors and how they were eliminated; Also addressed in detail are the calibrations for the shutter, pulse, GPS receiver, and timing errors.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	115 - 120
Cite this article:	Merrell, Roger L., Bains, Harnek S., Leach, Mark P., Kurtin, Duane J., Lucas, James R., "Refinements of the GPS/Photogrammetric Surveying Capability in the Texas State Department of Highways and Public Transportation," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 115-120.
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