Constructing a digital city on a web-3D platform

Abstract

In this study, we develop a platform that can display approximately 20 types of data via a web browser to realize a digital twin of a wider area, including a detailed reading display of block units and individual three-dimensional point cloud data (point cloud) of a city. Using actual data, we examine if the data model and visualization design correspond with the zoom level. Owing to the comparative examination of the wide-area display performance and the map representation design in a JavaScriptbased open-source library, we were able to develop a platform with light architecture and an easily customizable display. Furthermore, prototyping, based on Mapbox GL JS and Deck.GL, and the display of spatiotemporal flow layers, such as background maps, point cloud data in many places, dozens of layer display types, and the General Transit Feed Specification (GTFS) allowed for the seamless transition from the local government to the widearea display in the prefecture unit in approximately 10-20 s. It is recommended that this digital smart city platform should be standardized by other local governments, especially in areas where higher-order data visualization is yet to advance. To display this digital city in a lightweight environment, we consider the digital data situation of local governments in Japan. It is necessary to define the visualized design for each zoom level according to the characteristics of the data. We then arranged the display model of each zoom level for 20 types of urban infrastructure data related to the digital smart city by referring to the style schema of the tile form. Through these tasks, we organized the commonality and optimization of data models and formats. CCS CONCEPTS •Information systems → Data management systems →Database design and models

Geometric-based approach for linking various building measurement data to a 3D city model

“…The integration of diverse datasets is critical in creating wide-area 3D city models. Seto et al 2020 [9] successfully integrated and visualized complex and diverse datasets obtained in their study area, including aerial images, 3D building models, 3D point clouds, and data on people flow and traffic, while reducing data volume. However, data development for 3D point clouds is currently limited to a single location.…”

Panel Statements

“…We evaluate our system based on the challenges identified in previous xxxvi literature and discuss the future direction of digital twin development and research. This content is based on our research such as the work [11]. Fig.…”

Research on 3D geometric modeling of urban buildings based on airborne lidar point cloud and image

“…Compared with other regions on the earth, cities are relatively dense in population, infrastructure and other factors. The construction of "digital cities" will be an indispensable part of the digital earth network, so the construction of "digital cities" in various countries is increasingly urgent [1][2][3]. The so-called "digital city" is based on large-scale storage technology, multimedia technology and computer technology.…”