OPUS-RS Pair Points: Case Study
Publication: Journal of Surveying Engineering
Volume 136, Issue 2
Abstract
Referencing small engineering surveys to the national spatial reference system (NSRS) presents advantages in terms of spatially coordinating infrastructure and facilitates the inclusion of the infrastructure in a geographic information system. In cases where the total station is the appropriate tool to conduct the survey, online positioning user service rapid static (OPUS-RS) can be employed to economically establish azimuth pair points to orient the survey to the NSRS. Using OPUS-RS coordinates as observations along with global positioning system (GPS) vectors and total station observations in a least-squares adjustment to establish the azimuth pair points adds robustness to the least-squares adjustment to isolate systematic errors. All the observations contribute to the least-squares adjustment but some observations contribute more than others do. Redundancy numbers can be used to identify those observations that contribute little to the adjustment results. By analyzing the results of three least-squares adjustments, it will be shown that under normal conditions total station observations contribute little to the overall adjustment. Under obstructed conditions total station observations contribute to the vertical precision of the azimuth pair points. OPUS-RS appears to be less susceptible to vertical biases than GPS vectors at obstructed sites.
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References
Collins, J. P., and Langley, R. B. (1997). “Estimating the residual tropospheric delay for airborne differential GPS positioning.” Proc., 10th Int. Technical Meeting of the Satellite Div. of the Institute of Navigation, Institute of Navigation, Kansas, Mo., 1197–1206.
Estey, L. H., and Meertens, C. M. (1999). “TEQC: The multi-purpose toolkit for GPS/GLONASS data.” GPS Solutions, 3(1), 42–49.
Kashani, I., Pawel, W., and Grejner-Brzezinska, D. A. (2004). “On the reliability of the VCV matrix: A case study based on GAMIT and Bernese GPS software.” GPS Solutions, 8(4), 193–199.
Kashani, I., Pawel, W., Grejner-Brzezinska, D. A., and Mader, G. L. (2008). “A new network-based rapid-static module for the NGS online positioning user service—OPUS-RS.” Navigation, 55(3), 225–234.
Kashani, I., Wielgosz, P., Grejner-Brezinska, D. A., and Mader, G. L. (2005). “A new network-based rapid-static module for the NGS online positioning user service—OPUS-RS.” Proc., ION 61st Annual Meeting, Institute of Navigation, Cambridge, Mass., 928–936.
Kim, D., Langley, R. B., Bond, J., and Chrzanowski, A. (2003). “Local deformation monitoring using GPS in an open pit mine: Initial study.” GPS Solutions, 7(3), 176–185.
Lazio, P. (2006). “OPUS observations.” Surv. Land Inf. Sys., 66(3), 185–194.
Lazio, P. (2007). “Constraining network adjustments to OPUS-RS coordinate observations.” J. Surv. Eng., 133(3), 106–113.
Leick, A. (2004). GPS satellite surveying, 3rd Ed., Wiley, Hoboken, N.J.
Martin, D. (2007). “Geodetic connections: OPUS rapid static.” The American Surveyor, 4(3), 44,46–48.
Schwarz, C. R. (2008). “Heuristic weighting and data conditioning in the national geodetic survey rapid static GPS software.” J. Surv. Eng., 134(3), 76–82.
Schwarz, C. R., Snay, R. A., and Soler, T. (2009). “Accuracy assessment of the National Geodetic Survey’s OPUS-RS utility.” GPS Solutions, 13(2), 119–132.
Snay, R. A., and Soler, T. (2008). “Continuously operating reference station (CORS): History, applications, and future enhancements.” J. Surv. Eng., 134(4), 95–104.
Soehngen, H. F., Blackman, Z. A., and Lange, E. (1992). “Pair-point GPS over a total county, Nassau County, New York: A project with future GIS, engineering and surveying implications.” Surv. Land Inf. Sys., 52(4), 197–213.
Soler, T., Michalak, P., Weston, N. D., Snay, R. A., and Foote, R. H. (2006). “Accuracy of OPUS solutions for 1- to 4-h observing sessions.” GPS Solutions, 10(1), 45–55.
Zilkowski, D. B., D’Onofrio, J. D., and Frakes, S. J. (1997). “Guidelines for establishing GPS-derived ellipsoid heights (standards: 2 cm and 5 cm).” NOAA Technical Memorandum No. NGS-58, U.S. Dept. of Commerce, Silver Spring.
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© 2010 ASCE.
History
Received: Apr 15, 2009
Accepted: Sep 10, 2009
Published online: Apr 15, 2010
Published in print: May 2010
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