{TAIL ~ The location awareness method} 8, wherein in {HEAD ~ the step} of measuring the photographing angle, the photographing angle at the visual point of photographing the position identification tag is measured using an electric compass 
{ TAIL ~ The location awareness method } 8 , wherein in { HEAD ~ the step } of measuring the photographing angle , the photographing angle at the visual point of photographing the position identification tag is measured using an electric compass
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