Abstract:
Early and accurate measurement of progress is crucial for
the success of a project. Early detection of discrepancies and
deviation from the as-planned data allow more time for project
participants to identify the best solution. Monitoring the construction
progress requires the Project Managers to analyze a
lot of as-built data. This time-consuming process is prone to
error. To overcome this problem, people have started adopting
Building Information Models (BIM) for monitoring the construction
progress. In this paper, we have discussed how the site
photographs, which are readily available at all project sites,
can be effectively used for monitoring the progress. The 4D
as-planned model is prepared at the beginning of the project.
Then, a 3D model is reconstructed from time-lapsed as-built
photos. For any given time, the progress can be tracked by
comparing the 4D model and the 3D as-built model. The progress
data is extracted by superimposing the reconstructed
scene over the 4D as-planned model. The reconstructed model
allows the as-built photographs to be geo-registered by the 4D
as-planned model. As a result of this comparison, the progress
data is then visualized in an AR environment. Progress is visualized
in the 4D model using a quadrangle visualization scheme.
This type of approach presents a realistic understanding of the
construction progress and is a very good communication tool
between project participants. We have discussed both interior
and exterior construction progress monitoring is this paper.
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