We are told to take photos overlapping so that the same feature in two photos is seen max 30o 'apart'. As rule of thumb, if I'm 4m range from the subject, if I move sideways half that range = 2m for the next shot, that gives tan-1(2/4) = tan-1(0.5) = 25.6o 'away'. Does this make sense?
We are also told to get 80% overlap between photos. Half sideways plus half vertically as far as I can see gives 75% overlap. Does that make sense? Otherwise, for 80% overlap, I'm only allowed to move sideways 20% of the 4m range = 0.8m for the next shot - seems excessive.
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