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by Dr. Stephen C. Brown University of Alaska at Fairbanks Mat Su /Copper River District

Introduction to the G lobal P ositioning S ystem. by Dr. Stephen C. Brown University of Alaska at Fairbanks Mat Su /Copper River District. WHAT IS GPS?. Satellite based radio positioning system Developed and maintained by the U.S. Department of Defense

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by Dr. Stephen C. Brown University of Alaska at Fairbanks Mat Su /Copper River District

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  1. Introduction to the Global Positioning System by Dr. Stephen C. Brown University of Alaska at Fairbanks Mat Su /Copper River District

  2. WHAT IS GPS? • Satellite based radio positioning system • Developed and maintained by the • U.S. Department of Defense • Made up of three segments: • Space • Control • User or Ground receivers • Used for obtaining accurate locations • any where on earth

  3. GPS Is An Excellent Mapping Tool • Instantly gives: • Altitude • Speed • Longitude and Latitude

  4. Space Segment

  5. LAND SEA AIR NEED Four SV’s. • USER SEGMENT

  6. Control Segment • Maintained by the Department of Defense

  7. How It Works…. Trilateration

  8. How It Works….

  9. How It Works….

  10. How It Works….

  11. How It Works….

  12. Increasing Accuracy:Wide Area Augmentation Service (WAAS) 100 m 15 m <3m

  13. Recognizing Coordinate Systems Format TypeExample Coordinate(all are same position) Degrees, Minutes, Seconds (DMS): 290 34’ 15” Decimal Minutes (DM): 290 34.25’ Decimal Degrees (DD): 29.57080 290 34’ 15” is the same as 29 34 15 290 34.25’ is the same as 29 34.25

  14. Universal Transverse Mercator (UTM) Coordinates A “metric” coordinate system 5V 605913.13 E 6707279.66 N 6707279.66 meters Northing 605913.13 meters Easting

  15. UTM Zones

  16. The Right Datum is Important! GPS data stored in WGS84/NAD83 datum and displaying them with GIS data in NAD27 datum can result in 100's of meters in error!

  17. Error Problems in Alaska SV’s are on an southern equatorial plane Mountains often block the sky Extreme cold impact batteries

  18. PRACTICAL APPLICATIONS • Navigation • Sailing, hiking and aviation • Collecting and locating way-points • Locating Features • Stocking locations or stream surveys • Endangered or sensitive species locations • Locating trails or physical structures • GIS • Collecting GPS data along with attribute data • Mapping and database update • Surveying • Locating Control Points quickly

  19. Garmin GPS Receivers • Inexpensive and downloadable • Available locally for less than $150 • Most GPS receivers similar in operation

  20. SV Visibility clear view obstructed view clear view obstructed view

  21. SkyView Page • Satellite status appears while the unit “finds” the satellites • Acquisition can take several minutes

  22. Waypoints 4 track 2 3 waypoint 1

  23. Creating Waypoints

  24. Creating Waypoints

  25. Selecting Waypoints

  26. Selecting Waypoints

  27. Selecting Waypoints

  28. What is Geocaching? Geocaching is a worldwide “scavenger hunt” using GPS to find “caches” of treasure. The only rules are to leave something if you take something and do not disturb the cache

  29. www.easygps.com

  30. GPS Online Resources www.garmin.com www.trimble.com www.geocaching.com www.earth.google.com

  31. Steve Brown: ffscb2@uaf.edu 907-745-3639 Mat-Su/Copper River District University of Alaska Fairbanks Cooperative Extension Service

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