How to Correctly Use Ground Control Points in Drone Surveying and Mapping

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Our caller for today, Mark has a great question about setting up GCP’s. Mark is wondering if he can reuse known ground control points for drone surveying. Because most construction sites already have ground control points, reusing these known points will save considerable time and effort. But, can you do so without compromising on accuracy?

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Timestamps

08:55 - Today’s question is about setting Ground Control Points on a construction site
10:23 - Can you use existing GCP’s already marked on a construction site for drone surveying?
10:46 - What are Ground Control Points (GCP’s)? Paul explains in simple terms
12:34 - According to Pix4D, size of your GCP’s should be 10 times Ground Sampling distance. Is that right? Paul clarifies
14:20 - How to place your landing pad exactly over a known survey point; Paul suggests a great hack
14:52 - Optimum GCP distribution for drone surveying
15:03 - Within Pix4D, what is the benefit of changing Ground Control Points to checkpoints? And, why do you need control points in drone surveying?
16:00 - How can attending the Drone U mapping class help you?
17:14 - Ortho-rectified vs. Geo-rectified – Understanding the difference
19:38 - Can you use known points as your ground control points?
20:34 - Should you verify existing ground control points?

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Please watch: "How FAA's NPRM for Remote ID for Drones Will Hurt Hobby Pilots or RC Pilots with Jon McBride"
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