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OPUS Tools and Real Time Kinematic Networks

OPUS Tools and Real Time Kinematic Networks. Daniel Roman, Gerald Mader , Richard Foote, and Neil Weston NOAA , National Geodetic Survey. Outline. Introduction OPUS Tools RTN Coordinate Validation Future Applications. Introduction. NSRS: National Spatial Reference System

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OPUS Tools and Real Time Kinematic Networks

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  1. OPUS Tools and Real Time Kinematic Networks Daniel Roman, Gerald Mader, Richard Foote, and Neil Weston NOAA, National Geodetic Survey ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  2. Outline • Introduction • OPUS Tools • RTN Coordinate Validation • Future Applications ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  3. Introduction • NSRS: National Spatial Reference System • New datums in 2022 • Geometric: more IGS-like • Geopotential: based on a geoid model • Goal: Reduce errors to 1 cm when using 15 min of GNSS data • IGS solution build CORS solution • CORS solution will be used to build RTN’s ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  4. OPUS Tools • OPUS(-S) vs. OPUS-RS • A good solution vs. a quick solution • OPUS-Database • A place to showcase your results • OPUS-Projects • Solutions for multiple points over a fixed period • RTN Validator (soon) • Solutions for a single point at multiple times ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  5. OPUS-S vs. OPUS-RS • Static data: 2-48 hours of L1 & L2 • GPS-only (no GLONASS) • PAGES software • Option to Share to OPUS-DB (iff > 4 hours) • Available globally • Static data: >15 minutes to 2 hours of L1 & L2 • GPS-only (no GLONASS) • RSGPS software • No option to Share to OPUS-DB • Limited availability ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  6. OPUS-S • Prepare & QC the data. • Estimate a rough point-position using TEQC. • Compute distances to every available CORS. • Select the 3 “best” CORS • Complete the single-baseline processing using PAGES. • Check the solution quality & replace a CORS if needed. • Generate and email the report to the user. ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  7. How Good Can I Do With OPUS-S? As a quality test, 2-hour data sets from more than 200 CORS were submitted to OPUS-S and the results compared to the accepted coordinates. Mean: <0.1 cm N-S RMS: 0.8 cm E-W RMS: 1.4 cm Weston, N. “OPUS: Online Positioning User Service”, CGSIC USSLS MEETING, 2008-07-08, NEW ORLEANS, LA. ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  8. OPUS-Database • OPUS-DB ≠ NGSIDB • NGSIDB stores official coordinates at a point • OPUS-S only (4+ hours) • Must choose to Share • Builds a Shared Solution sheet (AKA “datasheet”) • Can have multiple pages • Doesn’t really highlight trends in solutions ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  9. OPUS-Projects • OPUS Projects gives users web-based access to simple management and processing tools for projects involving multiple sites and multiple occupations. The advantages of OPUS Projects are: • Data uploading through OPUS. • Customizable data processing via the PAGES software suite. • Visualization and management aids. ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  10. Using OPUS Projects 0. Get Trained! • Create a Project Name • Plan your network • Collect your data • Submit data to OPUS using Project Name • OPUS solutions sent to the Project • Make Session Solutions • Make Network Solution CORS 2 1 1 2 2 1 ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  11. NGS RTN Validation • While NGS doesn’t provide any direct-to-user RTN positioning, aligning RTNs to each other and the NSRS is in the interest of all. • Emergency management, national security, infrastructure management, weather prediction, deformation modeling, municipal and statewide GIS systems, scientific studies, machine guidance, land surveying, engineering design, airport obstruction surveys, NextGen air navigation, transportation monitoring and recreational activities are examples of applications relying on consistent, accurate coordinates from RTNs. • There are a number of ways that NGS can enable a process whereby these RTNs can be validated. ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  12. option 1. validate RTNs by making them CORS • NGS ingests some base stations in CORS network,provides coordinates and velocities. • CORS station density = 70+ km • No benefit for national solution for less than 70 km spacing Wednesday, 27 JAN 2015, Session C3 ION International Technical Meeting January 26-28, 2015 Dana Point, CA 12

  13. option 2a. validate RTNs by providing OPUS solutions • NGS provides OPUS solution. • How often to update? Every 5 years? • Doesn’t show potential trends or offsets. • RTN Users not able to readily see it. Wednesday, 27 JAN 2015, Session C3 ION International Technical Meeting January 26-28, 2015 Dana Point, CA 13

  14. option 2b. validate RTNs using OPUS-DB • Same as OPUS but now the data are shared for all to obtain. • Still must look at each solution individually. • Data sheets don’t show obvious offsets. Wednesday, 27 JAN 2015, Session C3 ION International Technical Meeting January 26-28, 2015 Dana Point, CA 14

  15. option 3. validate RTNs via OPUS projects • NGS provides OPUS project solution (not public.) • All base stations, 4+ sessions? • Update every 5 years? Wednesday, 27 JAN 2015, Session C3 ION International Technical Meeting January 26-28, 2015 Dana Point, CA 15

  16. option 4. validate RTNs via bluebook project • NGS provides data archival, datasheets. • All base stations • Update = never? RTN Rover occupies bench mark. • Remains a valid tool for users especially. • Doesn’t help with validating RTN base station coordinates directly. Wednesday, 27 JAN 2015, Session C3 ION International Technical Meeting January 26-28, 2015 Dana Point, CA 16

  17. option 5. validate RTNs with a modified OPUS process Upload to webpage RTN appends RINEX header (OPUS ID) • Major steps in OPUS are shown in left column • Some steps can be skipped for RTN case • Site is well established • Operator would have an ID and appropriate header info • Expedited upload avoids most QC checks OPUS Solution FTP Site Describe/ OPUS ID Verify Approve Display on RTN Validator Review OPUS-DB ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  18. RTN Validator Tool for Base Station • On a periodic (e.g., daily) basis, data are FTP’d and processed • Top section has similar elements as in OPUS-DB • Middle section shows available solutions • Bottom shows a time series for X-Y-Z or lat-lon-ht • Offset and trends are clear ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  19. RTN Validation for Users • To evaluate the base station, the RTN operator would make that sheet available and/or publish to OPUS-DB • Additionally, occupy established GPS bench marks listed in either the NGSIDB or OPUS-DB • Any systematic features observed between the established solutions and those from roving on the RTN would indicate a potential bias/offset • Should be located within 20 km intervals ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  20. Future Applications • RTN’s are becoming more ubiquitous • Ensuring they are adequately tied to the NSRS is essential • Steps for developing and implementing a new geometric datum in 2022 must address RTN’s • CORS will be adjusted to the new datum • Bench marks adjusted in a National Adjustment • RTN’s will be tied through OPUS-Projects or the NGS RTN Validation tool ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  21. Summary • A variety of tools are in the OPUS suite • OPUS-S still serves as a workhorse • It provides input to OPUS-DB for sharing • It provides the first adjustment in OPUS-Projects • It can serve as the processor for RTN Validation • OPUS-Projects provides more refined processing • It requires training and experience to use correctly • The NGS RTN Validation tool will provide clarity and simplicity in evaluating RTN base stations ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  22. Questions? Daniel R. Roman, Ph.D. Chief, Spatial Reference System Division NOAA/NOS, National Geodetic Survey W: +1-301-713-3200 x103 F: +1-301-713-4324 E: dan.roman@noaa.gov ION International Technical Meeting January 26-28, 2015 Dana Point, CA

  23. Webpages • NGS Main: • http://www.ngs.noaa.gov/ • OPUS Main: • http://www.ngs.noaa.gov/OPUS/ • Future RTN Validator Tool: • Look for an announcement on the NGS Main Page ION International Technical Meeting January 26-28, 2015 Dana Point, CA

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