The Universal Transverse Mercator grid system, shown as if all maps were laid together like an unfolded globe
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The US Army Map Service's scheme for recalculating the European triangulation, 1947
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Triangulation is probably the most complex and crucial method of surveying. It's used to determine the location of a point by measuring angles to it rather than distances (a process that's known as trilateration)
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What baffles me here is the difference between France and Germany/Austria/Swiss/Spain. I mean, yes the Alps exist, but it's not like France is a flat country either
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