This is a topographic map, right? Your job is to draw those lines every "x" meters of height? I was a scout boy when I was younger (actually I still am, once a scout boy always a scout boy haha), and we had to use topographic maps with those line indicating height to decide which way to go while exploring
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Almost there! Those are altitude lines indeed, but I am not actually trying to draw those. More info on my next engineering blog!