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

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

3. 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 A Little About Myself

4. 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 What is GPS?

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

6. Three Segments How Does It Work?

8. Need at least 4 satellites Trilateration

9. Why Use GPS To Map Your Assets?

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

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

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

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

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

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

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

17. Accuracy

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

19. 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 Mapping Grade Accuracy

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

21. Differential Correction

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

23. 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 How Do We Get There?

24. WAAS

25. 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 How Do We Get There?

26. Ohio VRS

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

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

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