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Integrating GPS and GIS: The Basics

Integrating GPS and GIS: The Basics. 6/19/12 Presented By: Doug Kotnik, GISP Precision Laser and Instrument. What we will cover. What is GPS? How does it work? Why use GPS to map my assets? How do I get the best accuracy? Questions. A Little About Myself. Doug Kotnik, GISP

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Integrating GPS and GIS: The Basics

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  1. Integrating GPS and GIS: The Basics 6/19/12 Presented By: Doug Kotnik, GISP Precision Laser and Instrument

  2. What we will cover • What is GPS? • How does it work? • Why use GPS to map my assets? • How do I get the best accuracy? • Questions

  3. A Little About Myself Doug Kotnik, GISP Precision Laser and Instrument • 20+ years in GIS/GPS • Have worked for some of the largest Engineering firms • Private consultant • GIS Director for Butler County • Precision Laser and Instrument

  4. What is GPS? GPS: Global Positioning System • Developed and run by DoD • 31+ satellites • 24 Needed for global coverage • 12,600 mi altitude • Orbit the Earth 2x day

  5. GNSS GNSS: Global Navigational Satellite System • Includes systems from other countries • GLONASS: Russian • European Union: Galileo (2020) • China: Compass (2020)

  6. How Does It Work? Three Segments

  7. How Does It Work?

  8. Trilateration • Need at least 4 satellites

  9. Why Use GPS To Map Your Assets?

  10. Why Use GPS To Map Assets? • Accurately Map New Assets

  11. Why Use GPS To Map Assets? • Field Verify Existing Assets

  12. Why Use GPS To Map Assets? • Navigation: Where is that valve?

  13. Why Use GPS To Map Assets? • Streamline Data Collection • Control Data Input • Drop down menus (domains) • Ranges • Yes/No • Date Fields • Drop down menus (domains) • Ranges • Yes/No

  14. Why Use GPS To Map Assets? • Incorporate Other Data Collection Devices • Cameras • Barcode Scanners • Utility Locators • Ground Penetrating Radar • Sign Reflectometers

  15. Why Use GPS To Map Assets? • Seamless integration with your existing GIS/Mapping or work order system

  16. Why Use GPS To Map Assets? • Return on Investment!! • Better understanding of your assets • More accurate information • More efficient field workers • Regulatory compliance

  17. Accuracy

  18. Accuracy Recreational: 10+ meters (30 ft) Mapping Grade: 5 meters to 10 cm (4in) Survey: <1-2 centimetres (< 1in)

  19. Mapping Grade Accuracy Dual Frequency Receivers • L1 and L2 signal • Using two signals allows receiver to more quickly determine your position • More Accurate Single Frequency • L1 only • Cost Less

  20. Error: It’s always something • Atmosphere Delay • Signal Multipath • Receiver Clock Errors • Number of Satellites Visible • Satellite Geometry and shading • Selective Availability – Turned off

  21. Differential Correction

  22. How Do We Get There? • Real Time Correction • Post Processing

  23. How Do We Get There? Real Time Correction • WAAS (Wide Area Augmentation System) • Initially developed for aircraft navigation • Required accuracy of 25 ft at least 95% of the time • Typical accuracy of about 3 ft

  24. WAAS

  25. How Do We Get There? Real Time Correction • VRS (Virtual Reference Stations) • Operated by ODOT in Ohio • 50+ Base stations • Access is free (for now) • Uses an internet connection via hotspot or phone

  26. Ohio VRS

  27. How Do We Get There? Post-Processing • Done using desktop software • Retrieve base station data • Trimble Pathfinder Office • Trimble GPS Analyst Extension for ArcMap

  28. GIS/GPS Software Configurations Pathfinder Office TerraSync GIS Data Trimble GPS Correct ESRI ArcPad GIS Data ArcMap Trimble GPS Analyst

  29. Questions Contact Info Doug Kotnik, GISP Precision Laser and Instrument 614-588-7085 dpk@laserinst.com

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