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Proceedings of CAD'17, 2017, 268-272
The Assessments of Hierarchical 3D Spatial Data Comparisons in an Urban District

Naai-Jung Shih, Chien-Wei Chen, Shih-Cheng Tzeng, National Taiwan University of Science and Technology

Abstract. This study applied the methodology in reverse engineering to verify the dynamic nature of urban fabric by the progress of development to date, while at the same time creating a historical connection to old map documents. From urban scale to building façade and street lamps, the methodology was approached using different types of scan data as organized in different hierarchies: general scans of the entire site from roof level and focused scans on selected façade on street level. The data types include the point clouds retrieved in Leica’s scan worlds and Faro’s scans, with selected regions using Asus Xtion Pro. For the first two types, the registrations were made under Cyclone’s, by importing Faro scans as separated scan worlds. The 3D scan data were also orthogonally projected to verify the correctness of 2D facility map of street lamps. Urban fabrics, as a summation of urban artifact configuration, do not usually feature consistent appearance and structure over several years. The changes actually illustrate the flexibility of what an urban space framework can achieve, and interpret the cross-relationship between buildings and temporary fixtures in macro and micro forms. Identifying the changes requires, first, the representation of urban fabrics, and the second, the collection of related data to verify the relationship between space and new modifications.

Keywords. Urban Fabric, 3D Scan, BIM, LOD 500, As-built Data

DOI: 10.14733/cadconfP.2017.268-272