Notes of the Country
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How did they get al this information? Aeroplanes, maps, spies?
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by
cyngast
moderator
Probably all three, plus maybe some from refugees from that area.
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Trench maps and aerial photography played a large part of the information required. See these 2 articles which explain how the information was collected by surveying the ground.
The War Office began to produce Trench Maps for the fighting units at the Front. A small team of Royal Engineer observers and topographers from the 1st Ranging Section were gradually joined by trained surveyors from the Ordnance Survey in Southampton and other men of the Royal Engineers with map-making experience. The team grew into a much larger operation of field survey companies. By 1918 the map-makers were able to make corrections and print and distribute maps from the British rear areas. Link: http://www.greatwar.co.uk/research/maps/british-army-ww1-trench-maps.htm
Link for aerial photography and images: http://www.telegraph.co.uk/history/world-war-one/inside-first-world-war/part-eight/10742060/aerial-photography-world-war-one.html
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