"Now that the sun is coming back now, everything's easier on the mountains, so now each family goes by themselves, every family with their own reindeer, to the winter places," he told The Local. "They don't split the reindeer until it's good weather."
Norway's 37,000 ethnic Sami people still live mainly in their ancestral lands in the country's far-North, with many still making a living by traditional reindeer herding.
While not considering himself Sami, Olsen said he had two Sami grandparents and was married to an ethnic Sami woman.
He said that while his drone photography was "just a hobby", it involved getting two-year fly permits from the Norwegian authorities.