Browsing by Author "Izkara, J. L."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
Item The application of lidar data for the solar potential analysis based on urban 3D model(SPIE, 2019) Prieto, I.; Izkara, J. L.; Usobiaga, E.; Themistocleous, Kyriacos; Papadavid, Giorgos; Michaelides, Silas; Ambrosia, Vincent; Hadjimitsis, Diofantos G.; Tecnalia Research & Innovation; LABORATORIO DE TRANSFORMACIÓN URBANAThis paper describes the methodology proposed for 1) calculate solar potential; 2) generate an urban 3D model, both based on LIDAR data; 3) semantize the urban 3D model with different data sources and calculations data for finally, 4) visualize the urban 3D model in a 3D web visualization tool. As a first step, digital surface model data of the case study is preprocessed selecting only building and ground points in order to later calculate the solar potential in a GIS tool. A workflow is presented describing the followed steps. In the second step, an urban 3D model is generated (in CityGML format) using cadastral data and LIDAR data, both digital surface and digital terrain model. Then, in the third step, the urban 3D model is semantized with a) buildings data (that comes from cadastral and statistical office), b) geometrical data such as main building orientation, number of adjoining walls, etc. (that comes from a geometric processing tool), c) key performance indicators data (that are calculated based on the urban 3D model data) and d) solar potential data, which have been calculated in the previous step. In the fourth step, all the gathered data is presented and can be filtered/selected in a 3D web visualization tool. This paper shows the potential of the usage of LIDAR data in different domains that can be connected using different technologies and in different scales.Item Collaborative platform based on standard services for the semi-automated generation of the 3d city model on the cloud(CRC Press/Balkema, 2018) Prieto, I.; Izkara, J. L.; Mediavilla, A.; Arambarri, J.; Arroyo, A.; Karlshøj, Jan; Scherer, Raimar; Tecnalia Research & Innovation; LABORATORIO DE TRANSFORMACIÓN URBANA; DIGITALIZACIÓN Y AUTOMATIZACIÓN DE LA CONSTRUCCIÓNThe urban 3D model is increasingly recognized as the adequate support to integrate, harmonize and store the information of a city and make it accessible to all stakeholders (citizens, city managers, companies or researchers). These models facilitate the cooperation of experts in different areas, contributing their knowledge in the generation of a single model. Urban 3D models will allow transforming urban management processes. One example of such processes is the Special Interior Reform Plans (PERI). These urban management processes are developed by the administration, but require the collaboration of different agents. In addition, they represent a clear example of the need to advance in the integration of heterogeneous data at different scales (building and city). The solution proposed in this article presents a platform based on web services for the collaborative generation of urban 3D models. The platform is composed of an information system based on standard data models (IFC and CityGML) and a web services infrastructure that manages the information and relationships stored in the information system at different levels. Besides, a prototype of 3 applications based on the service infrastructure and developed to support the urban management process is presented. The platform is used and tested in the collaborative generation process of the 3D model of the historic district of the city of Vitoria-Gasteiz (Spain) during the definition, editing and monitoring of the PERI of the historic center of the city.Item From point cloud to web 3D through CityGML(2012) Prieto, I.; Izkara, J. L.; Delgado, F. J.; Tecnalia Research & Innovation; LABORATORIO DE TRANSFORMACIÓN URBANAGeoreferenced 3D models represent an increasingly accepted solution for storing and displaying information at urban scale. CityGML, as a standard data model for the representation, storage and exchange of 3D city models, represents a very attractive solution which combines 3D geometric and semantic information in a single data model. The generation of CityGML models and later efficient visualization is still a complex task which represents the main goal of our work. This paper presents a three-phase methodology (generation, storage and usage) and the related developments required to achieve this goal. Firstly, the point cloud is surveyed (generation phase). Then, semantics is added to CityGML model which is stored in a database (storage phase). Finally, the geometric information is visualized in Web 3D (usage phase). On the one hand the geometry and appearance of city objects have to be generated, with the complexity that entails in order to obtain realistic 3D models. On the other hand, semantics have to be added to make it understandable for a computer. Semantic annotation can be achieved in a semi-automated way in which the main components and other elements of the model are procedurally annotated. This information is stored in a database for later access remotely through web services. Once the CityGML model is generated, semantics added and properly stored, the next step is to efficiently visualize the geometric information of CityGML on the Web 3D without any plugin requirement.