TRACK BED SHAPE MEASURING DEVICE AND TRACK BED SHAPE MEASURING METHOD

To provide a track bed shape measuring device that is capable of measuring a cross-sectional shape of a ballast track bed with high accuracy and high efficiency.SOLUTION: A track bed shape measuring device 1 comprises: a first acquisition section 21 for acquiring three-dimensional point group data of rail track waysides including color values of a plurality of first points in the track periphery; a first extraction section 22 for acquiring three-dimensional point group data of head top surfaces of a plurality of second points representing the head top surfaces of a rail among the plurality of first points; a second acquisition section 25 for acquiring three-dimensional point group data of cores of a plurality of fourth points that are arrayed at an interval on a center line of the head top surfaces of the rail, on the basis of the three-dimensional point group data of the head top surfaces; and a second extraction section 28 which selects two neighboring fourth points as a fifth point and a sixth point, and extracts, as seventh points, a plurality of first points whose distances in a fourth direction from a first plane passing the fifth point and being vertical to the fourth direction toward a sixth point from the fifth point, fall within a certain range, to acquire three-dimensional point group data of a cross-sectional shape of a ballast track bed.SELECTED DRAWING: Figure 4 【課題】バラスト道床の断面形状を高精度且つ高効率で測定することができる道床形状測定装置を提供する。【解決手段】道床形状測定装置１は、軌道周辺の複数の第１点の色値を含む線路沿線の３次元点群データを取得する第１取得部２１と、複数の第１点のうちレールの頭頂面を表す複数の第２点の頭頂面の３次元点群データを取得する第１抽出部２２と、頭頂面の３次元点群データに基づいて、レールの頭頂面の中心線上に間隔を空けて配列された複数の第４点の芯の３次元点群データを取得する第２取得部２５と、隣り合う２つの第４点を第５点及び第６点として選択し、第５点を通り且つ第５点から第６点に向かう第４方向に垂直な第１平面からの第４方向における距離が一定の範囲内である複数の第１点を第７点として抽出することにより、バラスト道床の断面形状の３次元点群データを取得する第２抽出部２８と、を有する。【選択図】図４