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Using GPS Laser Offsets

Learn the fundamentals of GPS technology, mitigate errors, and maximize productivity with GPS offsets and proper compass sensing techniques. Utilize software integration and follow compass calibration tips for precise measurements in the field.

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Using GPS Laser Offsets

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  1. Using GPS Laser Offsets

  2. The Basics of GPS Technology

  3. Global Positioning System (GPS) SpaceSegment your location is: 37°23.323’ N 122° 02.162’ W Control Segment User Segment

  4. Errors in GPS • Obstruction • Multipath • Atmospheric conditions • Clock bias • Receiver hardware • User

  5. Multipath & Obstruction

  6. Minimizing Errors • Post-process your GPS data • Wait for good satellite coverage • Use an offset!

  7. Maximize Productivity • Use antenna on a range pole • Maintain GPS lock between features • Maintain view on 5 or more satellites • Don’t expect best results in harsh environments • Use an offset!

  8. Other reasons for an Offset • You can’t get there (private property or behind a locked gate) • You don’t want to go there (it’s not safe) • You can be more productive from one spot (map multiple features)

  9. MAP THIS. STAND HERE. MAP THIS. STAND HERE. MAP THIS. STAND HERE. MAP THIS. STAND HERE.

  10. Measurement Values 101: The basics

  11. Software Integration

  12. About Compass Technology & Helpful Field Tips

  13. Compass Sensing • FACT: • Local magnetic interference will cause accuracy breakdowns – regardless of what compass you use.

  14. Your Person Eyeglasses, cell phones, pager, watch, clip board, etc. Your Environment Vehicle, building, power lines, etc. (20’ separation) Your Equipment Data collectors & GPS systems (18” separation) Be Aware of Proper Magnetic Hygiene

  15. Using a Range Triangulation Method The MILLION DOLLAR Question: NO! Can you use a compass from inside your vehicle? YES! Can you still perform laser offsets from your vehicle?

  16. Moving from one job site to the next • Major change in temperature • Major change in battery voltage Compass Calibration

  17. Simple Field Test to Determine Magnetic Interference • Target / Step Test • 1.) Choose a target, shoot it and note the azimuth. • 2.) Step along the sight line and shoot the same target again.

  18. Summary: • Why Offset? • Poor GPS coverage • Inaccessible target • Unsafe to reach • Increase efficiency

  19. Questions?

  20. Contact Information Jay Riester Mapping Tech Support jriester@seilerinst.com http://solutions.seilerinst.com http://seilermapsupport.wordpress.com/

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