Trilateration - Sanpensokuryo
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A surveying method in which three visible points on the ground are selected to form a triangle, and the lengths of the three sides of the triangle are measured to determine surveying reference points over a wide area. With the advent of precision distance measuring instruments that use radio waves and laser light, this method has rapidly come into use, replacing the traditional method of measuring angles, triangulation. Source: About Shogakukan Digital Daijisen Information | Legend |
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互いに見通せる地上の3点を選んで三角形をつくり、その3辺の長さのみを測定して広範囲に測量基準点を決定する測量法。電波やレーザー光を用いる精密な測距儀の登場により、従来の角度を測量する三角測量に代わって急速に普及した。
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