Comparision of photogrammetric point clouds with BIM building elements for construction progress monitoring
Comparision of photogrammetric point clouds with BIM building elements for construction progress monitoring
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DOI：
10.5194/isprsarchives-xl-3-341-2014
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发表时间：
2014-08
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影响因子：
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通讯作者：
S. Tuttas;A. Braun;A. Borrmann;Uwe Stilla
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文献类型：
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作者：
S. Tuttas;A. Braun;A. Borrmann;Uwe Stilla
对于施工进度监控，必须将某个时间的施工计划状态（按计划）与实际状态（竣工）进行比较。从建筑信息模型（BIM），其中包含建筑物的几何形状和施工进度计划的按计划状态。本文介绍了一种利用摄影测量生成点云的方法。人们认为，建筑物上的图像不能从任何地方拍摄，它似乎是必要的。因此，我们使用运动过程中的结构与控制点的组合，在一致的坐标系中创建缩放的点云。随后，该点云用于按计划建造的比较。通过光线投射，根据三角测量点和摄像机位置，将八叉树的体素标记为已占用、空闲或未知。这允许识别不存在的建筑部分。为了验证建筑物部件的刚度，基于按计划的模型平面的前后点进行第二次测试。在真实的条件下，以某内城建筑工地为例，对该方法进行了验证。
For construction progress monitoring a planned stat e of the construction at a certain time (as-planed) has to be compared to the actual state (as-built). The as-planed state is derived fr om a building information model (BIM), which contains the geometry of the building and the construction schedule. In this paper we int roduce an approach for the generation of an as-buil t point cloud by photogrammetry. It is regarded that that images on a construction c annot be taken from everywhere it seems to be neces sary. Because of this we use a combination of structure from motion process togeth er with control points to create a scaled point clo ud in a consistent coordinate system. Subsequently this point cloud is used for a n as-built ‐ as-planed comparison. For that voxels of an octree are marked as occupied, free or unknown by raycasting based on th e triangulated points and the camera positions. Thi s allows to identify not existing building parts. For the verification of the existen ce of building parts a second test based on the poi nts in front and behind the as-planed model planes is performed. The proposed procedure is tested based on an inner city construction site u nder real conditions.