Using GPS Laser Offsets

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Presentation transcript:

Using GPS Laser Offsets

The Basics of GPS Technology

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

Errors in GPS Obstruction Multipath Atmospheric conditions Clock bias Receiver hardware User There are multiple sources of error in GPS.

Multipath & Obstruction

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

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!

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)

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

Measurement Values 101: The basics

Software Integration

About Compass Technology & Helpful Field Tips

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

Be Aware of Proper Magnetic Hygiene 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)

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

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

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.

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

Questions?

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