173x Filetype PPTX File size 2.16 MB Source: www.ngs.noaa.gov
Objectives •Develop OPUS-Projects so that GNSS vectors from RTK surveys can be uploaded, checked, adjusted, and submitted to NGS •Develop a standard file format for GNSS vectors (GVX) •Develop tools for surveyors to combine vectors from RTK surveys with static GNSS data 09/07/2022 2 Real-Time Kinematic (RTK) Surveying Conventional RTK • Stationary single “base” station • Transmits precise coordinates and Base Rover GNSS observables to moving “rover” • < 10-20 km baseline length Applications • Survey engineering www.alberding.eu www.gcfarm.com • Mobile mapping • Precision agriculture • Mining • Construction 3 www.steckbeck.net 9/7/22 www.positionpartners.com.au Real-Time Networks Virtual Reference Stations (VRS) Master-Auxiliary Concept (MAC) • Vector “tails” referenced to virtual base • Vector “tails” connected to physical station base station • Base station position is variable • Base station position is fixed RTN Base RTN Base MUST store data as vectors!! VRS Control Center (Landau et al. 2002) RTN Base (Leica 2005) 4 9/7/22 Empirical Evaluation of the Accuracy of RTNs E 95% Confidence l l i p s oi d H ei gh t ± 5.0 cm, vertical ± 2.5 cm, horizontal H or i z on t al Or similar to accuracy of a 2-h OPUS-S solution! [Allahyari et al. 2018] 5 5 09/07/2022 GVX Flow Chart 09/07/2022 6
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