Geometric Accuracy of 3D Reality Mesh Utilization for BIM-Based Earthwork Quantity Estimation Workflows

Abstract

Current surveying techniques are typically applied to survey the as-is condition of buildings, brownfield sites and infrastructure prior to design. However, within the past decade, these techniques evolved significantly, and their applications can be enhanced by adopting unmanned aerial vehicles (UAVs) for data acquisition, up-to-date software for creating 3D reality mesh, which in turn opens new possibilities for much more efficient construction site surveying and constant updating and process management. In this study the workflows of three UAV-based photogrammetry techniques: Real Time Kinematic (RTK), Post-Processing Kinematic (PPK) and Global Positioning System (GPS) based on control points were analyzed, described, and compared to conventional surveying method with Global Navigation Satellite System (GNSS) receiver. Tests were performed under realistic conditions in 36 ha quarry in Lithuania. The results of the relationship between ground sample distance (GSD) and the comparison of volume measurements under each technique, including conventional method were analyzed. The deviation of data collected on field vs. generated in reality mesh, including ground control points (GCPs) and check points (CHPs) with different configurations, was investigated. The research provides observations on each workflow in the terms of efficiency and reliability for earthwork quantity estimations and explains processing schemes with advanced commercial software tools.

Caracterização de metodologias para extração de quantitativos com foco no orçamento de projetos em BIM

“…O método de avaliação foi por comparação entre informações lidas e tempo gasto em relação a padrão manual adotado. • [24] propôs fluxos de trabalho em BIM para estimativa de quantitativos de projetos de terraplanagem utilizando 3 técnicas de fotogrametria aérea não tripulada e comparou com o processo tradicional de estimativa de quantidades baseado no Sistema GNSS. O método de comparação se deu através dos volumes e áreas calculados pelo Autodesk Civil 3D e os resultados obtidos pelas 3 técnicas.…”

Protocol Proposal for Data Collection and Processing in Productivity Assessment of Earthworks Using Audio-Visual and Location-Sensing Technology

“…Kavaliauskas et al [32] compared the workflow of three unmanned aerial vehicle (UAV)-based photogrammetry techniques: real-time kinematic (RTK), post-processing kinematic (PPK), and GPS-based for efficiency, reliability, and geometric accuracy of earthwork quantity estimations.…”

B-GPS: Blockchain-Based Global Positioning System for Improved Data Integrity and Reliability

“…Various types of positioning exist, such as static measurement, real-time kinematic (RTK), and smartphone location tracking. These systems are used in various fields that require precise positioning, such as those that involve drones of kinematic changes and in autonomous driving [2][3][4][5][6]. In both cases, correction information is received in real-time to estimate precise coordinates.…”