This webinar presents the accuracies and precisions coming from a semester-long field study of real-time global navigation satellite system (GNSS) positioning. The data were collected by students in a surveying class under the supervision of the presenter of the webinar, so the results reflect those obtained by operators with very little experience in an area dominated by mature, leaf-on, broadleaf trees, so something towards a “worst case” scenario. Observations were collected with a Leica Viva GNSS receiver mounted atop a 2-m range pole. Students observed a collection of brass-cap survey markers established on the Storrs campus of the University of Connecticut. The markers were also observed using a 7-arcsecond total station for checks and comparisons. The webinar will present the study area and then the results as seen from various perspectives for different emphases, such as the effect of redundant observations and independence of observations. Despite the inexperience of the observers, centimeter-accuracy results were obtained when enough independent, real-time position were averaged together. The webinar will discuss how real-time observation are (or are not) independent, and present and discuss the results of the study, which are intended to reflect the sort of results practitioners could expect under similar conditions.
Thomas H. Meyer, Ph.D., Professor of Geodesy, University of Connecticut, Dept of Natural Resources and the Environment, was awarded a Ph.D. from Texas A&M University in College Station, Texas in 1998, where he was a research associate in the Mapping Sciences Laboratory. He now is a Professor of Geodesy in the Department of Natural Resources and the Environment at the University of Connecticut, where he teaches courses in geomatics, GNSS and plane surveying, geodesy, and geospatial analysis in Python. Dr. Meyer is a member of ASCE and the Connecticut Association of Land Surveyors. He is also a past president of the New England Section of the ACSM and a Fellow and the 2016/2019 president of the American Association for Geodetic Surveying. Dr. Meyer has published an undergraduate textbook on geodesy, numerous peer-reviewed journal articles, and is on the editorial boards of the Journal of Surveying Engineering (JSE) and Surveying and Land Information Science (SaLIS). He is a regular presenter at national meetings, giving workshops and seminars on numerous topics in geodesy, GNSS, and surveying. His most recent research projects include new formulations of low-distortion projections, and developing spatial statistical animal-movement models for mountain lions, bob cats, and salmon.
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