THREE-DIMENSIONAL SURFACE DISPLACEMENT MEASUREMENT SYSTEM

To precisely and automatically measure three-dimensional surface displacement of a surface to be measured from multiple sets of point group data pertaining to the surface to be measured acquired by a three-dimensional laser scanning function and displays the three-dimensional surface displacement at real time.SOLUTION: A reference slope SS for prescribing a three-dimensional surface displacement measurement direction is set to be a tilted plane formed by an axis of rotation RA connecting a measurement point M1 and a measurement point M2 and a rotation axis orthogonal line OA that passes through a measurement point M3 and is orthogonal to an axis of rotation RA on the basis of the three measurement points M1, M2, M3. Comparison source point group data as a reference of measurement are rotated around the axis of rotation RA such that an altitude difference between the measurement point M3 and an intersection PI becomes zero. Then, TIN is created from the comparison source point group data after rotation. In the meantime, comparison object point group data are rotated around the axis of rotation RA by the same rotational angle. A data processing device 3 measures a distance between a comparison measurement point within the comparison object point group data after rotation and a corresponding comparison source triangle.SELECTED DRAWING: Figure 6 【課題】３次元レーザースキャン機能によって取得された被測定対象面に係る複数組の点群データから被測定対象面の３次元面変位を精度良く自動的に計測しリアルタイムに表示する。【解決手段】３次元面変位計測方向を規定する基準傾斜ＳＳは、３つの測点Ｍ１,Ｍ２,Ｍ３に基づいて、測点Ｍ１と測点Ｍ２を結ぶ回転軸ＲＡと、測点Ｍ３を通り回転軸ＲＡに直交した回転軸直交線ＯＡとによって張られる傾斜平面とする。そして、計測の基準となる比較元点群データについては、測点Ｍ３と交点ＰＩの標高差がゼロになるように回転軸ＲＡの回りに回転させる。その後、回転後の比較元点群データからＴＩＮを作成する。一方、比較対象点群データについても同じ回転角度だけ回転軸ＲＡの回りに回転させる。データ処理装置３は、回転後の比較対象点群データ内の比較測点と、対応する比較元三角形との間の離れを計測する。【選択図】図６