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Integrating GPS and GIS Technologies into 4-H Youth Programs

Integrating GPS and GIS Technologies into 4-H Youth Programs. Michael J. Buschermohle Precision Agricultural Specialist University of Tennessee Extension. Overview. What is Global Positioning System (GPS) How GPS works Types of GPS receivers What is a Geographic Information System (GIS)

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Integrating GPS and GIS Technologies into 4-H Youth Programs

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  1. Integrating GPS and GIS Technologies into 4-H Youth Programs Michael J. Buschermohle Precision Agricultural Specialist University of Tennessee Extension

  2. Overview • What is Global Positioning System (GPS) • How GPS works • Types of GPS receivers • What is a Geographic Information System (GIS) • Integrating GPS and GIS into 4-H programs

  3. What is GPS GPS is a navigational system that can accurately locate your position anytime, anywhere, and regardless of weather on Earth • Satellite-based navigation systems made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense • Satellites orbit the earth at an altitude of about 12,500 miles • Radio signals from the satellites can be used to determine accurate georeferenced position information

  4. Satellite Signal Satellites broadcast several pieces of information • Emphemeris (Orbital) data • Timing data

  5. How Does GPS Work Speed of light = 186,000 mi/sec

  6. Trilateration

  7. Sources of GPS Error • Clock Errors • Atmospheric Interference • Ephemeris (Orbital) Variation • Satellite Configuration • Signal Multipath

  8. Sources of GPS Error Clock Errors Let’s put some numbers on it Altitude = 12,500 mi. Speed of light = 186,000 mi/sec Transmission Time = 0.067 sec What happens if we are off a little? 0.001 sec * 186,000 mi/sec = 186 mi

  9. Sources of GPS Error Atmospheric Interference

  10. Sources of GPS Error Ephemeris (Orbital) Variation

  11. Sources of GPS Error Satellite Configuration Good (low) DOP Poor (high) DOP Measure of the geometrical strength of the GPS satellite configuration

  12. Sources of GPS Error Signal Multipath

  13. Counteracting GPS Errors • Land-Based Differential Correction • Satellite-Based Differential Correction • User Base Station RTK Correction

  14. ) ) ) ) ) ) ) Counteracting GPS Errors Land-Based Differential GPS Correction Coast Guard Beacon Differential Correction Codes

  15. Counteracting GPS Errors Satellite-Based Differential GPS Correction Differential Correction Codes WAAS Omnistar Deere

  16. ) ) ) ) ) ) ) Counteracting GPS Errors Kinematic Differential GPS Correction Operator’s Base Station Differential Correction Codes

  17. GPS Receivers

  18. Basic Navigation Information Supplied by GPS Receivers • Your current position • Coordinates (Latitude and Longitude, UTM, etc.) • Elevation • Direction to specified waypoints • Distance to specified waypoints • Your speed of travel • Your direction of travel

  19. Geographic Information Systems (GIS) GIS is a collection of computer hardware, software, and geographic data for capturing, managing, analyzing, and displaying all forms of geographically referenced information.

  20. GIS Maps are Based on Layers Rivers Capitals Roads States Lakes

  21. Integrating GPS and GIS Technologies into 4-H Youth Programs • What Type of GPS receiver should you buy? What is your application?

  22. GPS Applications • Teaching users about GPS receivers • Hiking • Geocaching • Nature Study • Hunting • Fishing • Boating • Biking • Skiing • Golf

  23. Low Cost (Handheld) GPS Receivers Cost $100 – $400 Features Internal Memory 8 – 30 M SC Card Expandability Mapping Software Compatibility

  24. Mapping Software Cost $100 - 150 Compatibility depends on the unit

  25. GPS Applications • Collecting geo-referenced data • GIS Mapping

  26. Pocket PCs Running Windows CE $600 $400 HP IPAQ

  27. Integrating GPS and GIS Technologies into 4-H Youth Programs What GIS software should you buy?

  28. GIS Software • ESRI • ArcMap • ArcPad for Windows CE • Farm Works • Map Shots • JD Office • Easy Suite

  29. On-Line Training Course“Learning How to Use ArcPad 7.0”

  30. On-Line Training Course“Learning How to Use ArcPad 7.0” Learning Module 1: Moving Data to and From Your PDA Learning Module 2: Getting to Know ArcPad Learning Module 3: Displaying Data Learning Module 4: Creating Features Learning Module 5: Using Your GPS Receiver Learning Module 6: Capturing Features Using Your GPS Receiver Learning Module 7: Making Your Map Look Pretty Learning Module 8: Retrieving Information from Your Map

  31. Some GPS Applications for Youth Geocaching

  32. Some GPS Applications for Youth Collecting and Mapping Geo-referenced data in Your Community

  33. Questions?

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