Interpreting OPUS-Static Results Accurately

AbstractThe Online Positioning User Service (OPUS) operated by the National Geodetic Survey (NGS) has consolidated into a very attractive tool for surveyors, engineers, and the academic community to procure precise/accurate positions from global positioning system (GPS) observations. The OPUS utility continues to be improved since it was successfully launched in 2000. In general, each update results in better reliability of the precision and accuracy of OPUS solutions. However, necessary software modifications could also introduce certain biases, some significant, complicating the interpretation of OPUS results, particularly for applications that rely on high-accuracy absolute positions. This article concentrates on the interpretation of OPUS-Static solution reports primarily in relation to the transformation of reference frames and geoid models, which are two basic scientific ingredients in practical geodetic-surveying enterprises. One-year continuous GPS observations collected at a landslide site in Pue...

[1]  Guoquan Wang,et al.  GPS Landslide Monitoring: Single Base vs. Network Solutions — A case study based on the Puerto Rico and Virgin Islands Permanent GPS Network , 2011 .

[2]  Guoquan Wang,et al.  A stable reference frame for landslide monitoring using GPS in the Puerto Rico and Virgin Islands region , 2014, Landslides.

[3]  Peter Lazio.  OPUS-S Extended Data , 2011 .

[4]  Xavier Collilieux,et al.  IGS08: the IGS realization of ITRF2008 , 2012, GPS Solutions.

[5]  Guoquan Wang.  Teaching High-Accuracy Global Positioning System to Undergraduates Using Online Processing Services , 2013 .

[6]  W. Stone.  The Evolution of the National Geodetic Survey's Continuously Operating Reference Station Network and Online Positioning User Service , 2006, 2006 IEEE/ION Position, Location, And Navigation Symposium.

[7]  Guoquan Wang,et al.  OPUS for Horizontal Subcentimeter-Accuracy Landslide Monitoring: Case Study in the Puerto Rico and Virgin Islands Region , 2012 .

[8]  G. Wang,et al.  Millimeter-accuracy GPS landslide monitoring using Precise Point Positioning with Single Receiver Phase Ambiguity (PPP-SRPA) resolution: a case study in Puerto Rico , 2013 .

[9]  Jim R. Ray,et al.  A Synopsis of the IGS Orbits Used in OPUS , 2013 .

[10]  Chris Pearson,et al.  Introducing HTDP 3.1 to transform coordinates across time and spatial reference frames , 2012, GPS Solutions.

[11]  Richard A. Snay,et al.  Continuously Operating Reference Station (CORS): History, Applications, and Future Enhancements , 2008 .

[12]  Charles R. Schwarz,et al.  Statistics of Range of a Set of Normally Distributed Numbers , 2006 .

[13]  Richard G. Gordon,et al.  Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions , 1994 .

[14]  Richard G. Gordon,et al.  Geologically current plate motions , 2010 .

[15]  Richard A. Snay,et al.  Accuracy of GPS-derived relative positions as a function of interstation distance and observing-session duration , 2001 .

[16]  Guoquan Wang,et al.  Using OPUS for Measuring Vertical Displacements in Houston, Texas , 2013 .

[17]  Richard A. Snay,et al.  Accuracy of OPUS solutions for 1- to 4-h observing sessions , 2006 .

[18]  Guoquan Wang,et al.  Kinematics of the Cerca del Cielo, Puerto Rico landslide derived from GPS observations , 2012, Landslides.

[19]  Z. Altamimi,et al.  ITRF2008: an improved solution of the international terrestrial reference frame , 2011 .