integrating gps and gis: the basics 6/19/12 presented by: doug kotnik, gisp precision laser and...
TRANSCRIPT
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Integrating GPS and GIS: The Basics
6/19/12Presented By:
Doug Kotnik, GISPPrecision Laser and Instrument
![Page 2: Integrating GPS and GIS: The Basics 6/19/12 Presented By: Doug Kotnik, GISP Precision Laser and Instrument](https://reader036.vdocument.in/reader036/viewer/2022062407/56649e045503460f94af0019/html5/thumbnails/2.jpg)
•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, GISPPrecision 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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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 Office TerraSync
GIS Data
ArcMapTrimble GPS Analyst
ESRI ArcPad
Trimble GPS Correct