Discrepancies in Measurements of a Complex Street Intersection: Laser Scanner vs. Accurate Total Station
This study compares 36 point positions and 211 distance measurements completed with a modern, 12-second laser scanner and a highly accurate, one-second robotic total station, the latter serving as the benchmark instrument. The main objective of this quantitative comparison is to explore the accuracy and usability of a relatively large point-cloud model as a virtual surveying tool for redesign/reconstruction purposes. This project involves the generation of a large, 3D, point-cloud model (240+ million points) of a complex city intersection, encompassing an approximate area of 300 ft × 750 ft and containing five converging elements: three streets and two railroads. It is an accident-prone location requiring redesign. The resulting computer model has been geo-referenced in the Georgia East State Plane Coordinate System (SPCS) using control points with coordinates established by GPS (Global Positioning System) via a rapid, network-based, Real-Time-Kinematic (RTK) approach. The final point-cloud model was donated to the city to assist in the redesign of the intersection. A full analysis of the referred discrepancies is presented, and recommendations on improving the overall current accuracies are provided.
A Development of a Web-Based Mobile Daily Logistics Management Application for Construction Project
Inefficient site logistics slows down the construction work and ultimately leads to cost overrides for the entire project. Various systems and applications have been developed to improve the efficiency of onsite logistics management. However, due to limitations such as the cost of purchasing and maintenance, these applications are not actively used in the construction industry. The recently introduced online database management program development tool allows anyone without special knowledge to develop a database management system that can solve their problems. This paper introduces how this database development tool can be used to develop an online application that can help manage onsite logistics. This application was developed to allow project managers and subcontractor managers to share material delivery information and plan lifting equipment usage. This paper also discusses the merits and limitations of the program developed based on the evaluation of experts.