Low-cost construction progress monitoring by mobile phone photogrammetry

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Progress monitoring and quality control are essential processes for large construction projects to ensure that tasks are completed on time and within the specified dimensional tolerances, and to allow timely action to be taken to remedy discrepancies between the plan and built. In Canada, current construction progress monitoring practices are mostly manual processes that are time-consuming, costly and error-prone. Moreover, their very nature allows only the collection of a limited amount of qualitative data. In order to identify the causes of delays and cost overruns, site supervisors must spend a considerable amount of time analyzing the collected data. This not only prevents timely identification of issues, but also distracts site supervisors from monitoring current construction activities, productivity and safety. This project will address the lack of an efficient and accurate construction progress-monitoring scheme in Canada. Specifically, it will develop new methodology to allow accurate quantification of installed pipework for plumbing and heating systems with mobile phone camera technology. Three-dimensional models will be automatically created from imagery captured with the phones (several will be tested) for comparison with the planned models. The industry partner for this project is MJS Mechanical, a professional mechanical contracting and service firm specializing in new building construction, building upgrades and facility services. MJS has committed to this project because they have identified accurate pipework quantification is a significant problem in their progress tracking system that can be addressed by this research.