Development of a 3d Webgis System for Retrieving and Visualizing Citygml Data Based on Their Geometric and Semantic Characteristics by Using Free and Open Source Technology

Abstract

ABSTRACT:CityGML is considered as an optimal standard for representing 3D city models. However, international experience has shown that visualization of the latter is quite difficult to be implemented on the web, due to the large size of data and the complexity of CityGML. As a result, in the context of this paper, a 3D WebGIS application is developed in order to successfully retrieve and visualize CityGML data in accordance with their respective geometric and semantic characteristics. Furthermore, the available web technologies and the architecture of WebGIS systems are investigated, as provided by international experience, in order to be utilized in the most appropriate way for the purposes of this paper. Specifically, a PostgreSQL/ PostGIS Database is used, in compliance with the 3DCityDB schema. At Server tier, Apache HTTP Server and GeoServer are utilized, while a Server Side programming language PHP is used. At Client tier, which implemented the interface of the application, the following technologies were used: JQuery, AJAX, JavaScript, HTML5, WebGL and Ol3-Cesium. Finally, it is worth mentioning that the application's primary objectives are a user-friendly interface and a fully open source development.

Visualising Detailed Citygml and Ade at the Building Scale

“…A large number of development and research efforts into CityGML visualisation focuses on how to best use 3DCityDB to perform and look better, and integrate with other information sources and types. This includes development of different ways to display models, integration with services to draw data from a wide variety of sources and many other works (Prieto et al, 2012;Pispidikis and Dimopoulou, 2016;Wang et al, 2018). Due to the conversion of files to glTF and KML, the 3DCityDB webmap-client is only able to select what 3DCityDB calls 'top-level elements'.…”

A Semantically Enriched and Web-Based 3d Energy Model Visualization and Retrieval for Smart Building Implementation Using Citygml and Dynamizer Ade

“…Retrieving CityGML data via OGC WFS 2.0 presents a number of technical problems relating to the characteristics of the CityGML and the fact that CityGML schema is much more complex than those usually deployed in WFS. For that reason, the extension of the OGC WFS 2.0 has been further examined and implemented so that the complex structure of CityGML can be successfully retrieved (Curtis, 2008;Yao et al, 2018;Zhu, et al, 2016;Pispidikis and Dimopoulou, 2016).…”

Conceptual Model of Citygml Restful Web Service

“…However, serving CityGML via OGC WFS 2.0 presents a number of technical problems with regard to the structure of the CityGML models and the fact that CityGML schema is much more complex than those usually deployed in WFS. For that reason, the extension of the OGC WFS 2.0 has been further examined so that the complex structure of CityGML can be successfully retrieved (Curtis, 2008;Yao et al, 2018;Kolbe et al, 2009;Zhu, et al, 2016;Pispidikis and Dimopoulou, 2016). It should be noted that the WFS 2.0 and previous versions used a Remote-Procedure-Call-Over-HTTP architectural style implementing XML for any payload.…”