This lab focused on measuring GPS data quality by comparing horizontal precision and accuracy. The goal was to see how close repeated GPS points fell to each other and how close they were to the true reference location.
Results
Figure 1. Average waypoint with 50%, 68%, and 95% precision buffers.
From the analysis, the horizontal precision at the 68% level was 6.6 m, and the vertical precision was 5.0 m. When comparing accuracy, the distance between the average waypoint and the reference point was about 3.5 m. This shows that while the GPS points were relatively consistent (precision), they did not perfectly match the true location (accuracy).
Horizontal accuracy measures how close the GPS average is to the actual reference point, while horizontal precision measures how tightly repeated GPS readings cluster together. Both metrics are important because a GPS unit can be precise without being accurate, or accurate without being precise.
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