Thanks Oto, that's a really useful tool. I can see why the QR codes aren't going to be of much use in some applications, but in some limited circumstances it might be: I'm an archaeologist and when we use drones for capturing excavation data we are often operating less than 20 m above our surface and the tool suggests that the required pixel size is within a practical range. However, for the most part I'd say that standard targets are going to be the more practical option
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