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Integrating GPS and GIS: The Basics 6/19/12 Presented By: Doug Kotnik, GISP Precision Laser and Instrument
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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
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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
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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?
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GNSS: Global Navigational Satellite System Includes systems from other countries GLONASS: Russian European Union: Galileo (2020) China: Compass (2020) GNSS
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Three Segments How Does It Work?
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Need at least 4 satellites Trilateration
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Why Use GPS To Map Your Assets?
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Accurately Map New Assets Why Use GPS To Map Assets?
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Field Verify Existing Assets Why Use GPS To Map Assets?
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Navigation: Where is that valve? Why Use GPS To Map Assets?
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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?
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Incorporate Other Data Collection Devices –Cameras –Barcode Scanners –Utility Locators –Ground Penetrating Radar –Sign Reflectometers Why Use GPS To Map Assets?
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Seamless integration with your existing GIS/Mapping or work order system Why Use GPS To Map Assets?
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Return on Investment!! –Better understanding of your assets –More accurate information –More efficient field workers –Regulatory compliance Why Use GPS To Map Assets?
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Accuracy
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Recreational: 10+ meters (30 ft) Mapping Grade: 5 meters to 10 cm (4in) Survey: <1-2 centimetres (< 1in) Accuracy
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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
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Atmosphere Delay Signal Multipath Receiver Clock Errors Number of Satellites Visible Satellite Geometry and shading Selective Availability – Turned off Error: It’s always something
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Differential Correction
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Real Time Correction Post Processing How Do We Get There?
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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?
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WAAS
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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?
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Ohio VRS
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Post-Processing –Done using desktop software –Retrieve base station data Trimble Pathfinder Office Trimble GPS Analyst Extension for ArcMap How Do We Get There?
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GIS/GPS Software Configurations GIS Data Pathfinder OfficeTerraSync GIS Data ArcMap Trimble GPS Analyst ESRI ArcPad Trimble GPS Correct
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Questions Contact Info Doug Kotnik, GISP Precision Laser and Instrument 614-588-7085 dpk@laserinst.com
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