UAV PHOTOGRAMMETRY IMPLEMENTATION TO ENHANCE LAND SURVEYING, COMPARISONS AND POSSIBILITIES

The use of Unmanned Aerial Vehicles (UAVs) for surveying is now widespread and operational for several applications – quarry monitoring, archeological site surveys, forest management and 3D modeling for buildings, for instance. UAV is increasingly used by land surveyors especially for those kinds of projects. It is still ambiguous whether UAV can be applicable for smaller sites and property division. Therefore, the objective of this research is to extract a vectorized plan utilizing a UAV for a small site and investigate the possibility of an official land surveyor exploiting and certificating it. To do that, two plans were created, one using a UAV and another utilizing classical land surveyor instruments (Total Station). A comparison was conducted between the two plans to evaluate the accuracy of the UAV technique compared to the classical one. Moreover, other parameters were also considered such as execution time and the surface covered. The main problems associated with using a UAV are the level of precision and the visualization of the whole area. The results indicated that the precision is quite satisfactory with a maximum error of 1.0 cm on ground control points, and 4 cm for the rest of the model. On the other hand, the results showed that it is not possible to represent the whole area of interest utilizing a UAV, due to vegetation

Indoor guided evacuation: TIN for graph generation and crowd evacuation

International audienc

Developing Optimal Paths for Evacuating Risky Construction Sites

International audienc

Hazards, Vulnerability and Interactions at Construction Sites: spatial risk mapping

International audienceConstruction sites contain several supporting facilities that are required to perform construction activities. These facilities may be exposed to several hazards. This may lead to adverse consequences for the whole construction process, which in turn lead to fatal accidents that have a major impact on worker and employee productivity, project completion time, project quality and project budget. This paper proposes a framework to visualize spatial variability of a construction site's risk, generated by natural or technological hazard, through using hazard and vulnerability interaction matrices, between potential sources and potential surrounding targets. The proposed framework depends on using analytical hierarchy process (AHP), the potential global impact of facilities obtained from the interaction matrices, and the capabilities of GIS to generate results in the mapping form. The methodology is implemented in a real case project. The results show the capability of framework to visualize construction site risks due to natural or technological hazard, and also identify the most at risk position within a construction site