Dr. Benjamin Hagedorn

Contact

Room: H-2.25
Tel.: +49 (0)331 5509-3912
Fax: +49 (0)331 5509-172
Email: benjamin.hagedorn(at)hpi.de

Current Research Projects

Zeitliche und prozessbezogene Informationsvisualisierung mit 3D-Analysekarten
Technische Anlagenoptimierung mit Sensor-Analytik (TASA)
3D Urban Analytics

Past Research Projects

OGC 3D Portrayal Service (3DPS)
Research Group 3D Geoinformation (InnoProfile Initiative)
INGEOS (ZIM Nemo)
OGC 3D Portrayal Interoperability Experiment (3DPIE)
OGC Web View Service (WVS)
OGC 3D Viewer Client (OWS-4)
3D View Service Technology
3D SOA Technology
3D Smart Interaction Technology
Collaboration Tools for 3D City Models

Publications

Ontology-Driven Analytics for Indoor Point Clouds.Stojanovic, Vladeta; Hagedorn, Benjamin; Trapp, Matthias; Döllner, Jürgen (2020).
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AbstractAutomated processing, semantic-enrichment and visual analytics methods for point clouds are often use-case specific for a given domain (e.g, for Facility Management (FM) applications). Currently, this means that applicable processing techniques, semantics and visual analytics methods need to be selected, generated or implemented by human domain experts, which is an error-prone, subjective and non-interoperable process. An ontology-driven analytics approach can be used to solve this problem by creating and maintaining a Knowledge Base, and utilizing an ontology for automatically suggesting optimal selection of processing and analytics techniques for point clouds. We present an approach of an ontology-driven analytics concept and system design, which supports smart representation, exploration, and processing of indoor point clouds. We present and provide an overview of high-level concept and architecture for such a system, along with related key technologies and approaches based on previously published case studies. We also describe key requirements for system components, and discuss the feasibility of their implementation within a Service-Oriented Architecture (SOA).
Customizable Asymmetric Loss Functions for Machine Learning-based Predictive Maintenance.Ehrig, Lukas; Atzberger, Daniel; Hagedorn, Benjamin; Klimke, Jan; Döllner, Jürgen (2020).
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AbstractIn many predictive maintenance scenarios, the costs for not accurately detecting or anticipating faults can be considerably higher than the cumulative costs for inspections or premature maintenance. However, conventional symmetric loss functions widely used in machine learning cannot reflect such different costs. In this paper, we propose a method to construct asymmetric loss functions for regression tasks that are capable to better reflect this cost imbalance during the training of machine learning models and that allow for modeling the loss function to a) precisely match the cost relation for both kinds of errors where they can be estimated, b) control the impact of outliers, and c) manage the risk of over- or underestimation of the target variable, even when exact costs for (at least) one side are not known. We demonstrate on a realistic data set that the customized asymmetric loss functions can significantly reduce the impact of overestimations of the remaining useful life and can help to take more informed decisions on maintenance planning, leading to more cost-efficient production processes.
Sensor Data Visualization for Indoor Point Clouds.Stojanovic, Vladeta; Trapp, Matthias; Hagedorn, Benjamin; Klimke, Jan; Richter, Rico; Döllner, Jürgen (2019).
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AbstractIntegration and analysis of real-time and historic sensor data provides important insights into the operational status of buildings. There is a need for the integration of sensor data and digital representations of the built environment for furthering stakeholder engagement within the realms of Real Estate 4.0 and Facility Management (FM), especially in a spatial representation context. In this paper, we propose a general system architecture that integrates point cloud data and sensor data for visualization and analysis. We further present a prototypical web-based implementation of that architecture and demonstrate its application for the integration and visualization of sensor data from a typical office building, with the aim to communicate and analyze occupant comfort. The empirical results obtained from our prototypical implementation demonstrate the feasibility of our approach for the provisioning of light-weight software components for the service-oriented integration of Building Information Modeling (BIM), Building Automation Systems (BASs), Integrated Workplace Management Systems (IWMSs), and future Digital Twin (DT) platforms.
Semantic Enrichment of Indoor Point Clouds: An Overview of Progress towards Digital Twinning.Stojanovic, Vladeta; Trapp, Matthias; Richter, Rico; Hagedorn, Benjamin; Döllner, Jürgen in 37th eCAADe Conference (2019).
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AbstractThis paper presents an approach towards the development of a service-oriented platform for semantic enrichment of indoor point clouds. It mainly focuses on integrated methods for the capture of as-is 3D point clouds using commodity mobile hardware, classification of point cloud clusters using a multiview-based method, geometric reconstruction of room boundaries, interactive 3D visualization, sensor data visualization, and tracking of spatial changes and user annotations via a secure ledger. Implementing the methods in a prototypical web-based application, we demonstrate our approach for the semantic enrichment of indoor point clouds and the generation of base data for Digital Twin representation.
Towards the Generation of Digital Twins for Facility Management Based on 3D Point Clouds.Stojanovic, Vladeta; Trapp, Matthias; Richter, Rico; Hagedorn, Benjamin; Döllner, Jürgen (2018).
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AbstractAdvances versus adaptation of Industry 4.0 practices in Facility Management (FM) have created usage demand for up-to-date digitized building assets. The use of Building Information Modelling (BIM) for FM in the Operation and Maintenance (O&M) stages of the building lifecycle is intended to bridge the gap between operations and digital data, but lacks the functionality of assessing and forecasting the state of the built environment in real-time. To accommodate this, BIM data needs to be constantly updated with the current state of the built environment. However, generation of as-is BIM data for a digital representation of a building is a labor intensive process. While some software applications offer a degree of automation for the generation of as-is BIM data, they can be impractical to use for routinely updating digital FM documentation. Current approaches for capturing the built environment using remote sensing and photometry-based methods allow for the creation of 3D point clouds that can be used as basis data for a Digital Twin (DT), along with existing BIM and FM documentation. 3D point clouds themselves do not contain any semantics or specific information about the building components they represent physically, but using machine learning methods they can be enhanced with semantics that would allow for reconstruction of as-is BIM and basis DT data. This paper presents current research and development progress of a service-oriented platform for generation of semantically rich 3D point cloud representations of indoor environments. A specific focus is placed on the reconstruction and visualization of the captured state of the built environment for increasing FM stakeholder engagement and facilitating collaboration. The preliminary results of a prototypical web-based application demonstrate the feasibility of such a platform for FM using a service-oriented paradigm.
Konzepte und Techniken zur servicebasierten Visualisierung von geovirtuellen 3D-Umgebungen. Technical Report (PhD dissertation), Hagedorn, Benjamin PhD thesis, Potsdam. (2016).
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AbstractIm Allgemeinen liegen Geodaten und georeferenzierte Daten verteilt vor, sind heterogen in ihrem Inhalt und ihrer Form, umfassen sehr große Datenmengen und müssen in verschiedenen IT-Informationssystemen integriert und in verschiedenen Anwendungskontexten genutzt werden. Im Mittelpunkt dieser Arbeit stehen deshalb Konzepte und Techniken für die Integration, Visualisierung, Analyse, Bereitstellung und Nutzung von 2D- und 3D-Geodaten sowie georeferenzierten Daten. Hierbei wird ein Ansatz verfolgt, der zum einen virtuelle 3D-Umgebungen als konzeptionellen und technischen Rahmen nutzt und zum anderen auf serviceorientierten Softwarearchitekturen und Geo-Standards basiert. Die vorgestellten Konzepte und Verfahren stellen damit Schlüsselbausteine dar, um neuartige IT-Lösungen und Anwendungen für 3D-Geoinformationen, z.B. als Bestandteile von Geodateninfrastrukturen, zu realisieren. Im Bereich der servicebasierten 3DGeovisualisierung beschreibt diese Arbeit, wie virtuelle 3D-Stadtmodelle für die Integration heterogener und verteilter Geodatenquellen genutzt werden können. Dazu werden Anforderungen für die Integration identifiziert und ein Konzept für die Integration auf Datenebene und die Integration auf Visualisierungsebene entworfen und deren Umsetzung am Beispiel komplexer 3D-Bauwerksinformationsmodelle beschrieben und demonstriert. Im Bereich servicebasierter, bildbasierter 3DPortrayal-Services wird mit dem Web View Service (WVS) ein spezialisierter SoftwareService für die Visualisierung, Interaktion und Analyse von geovirtuellen 3D-Umgebungen konzipiert und entwickelt. Kernkonzept dieses Services sind die serverseitige Datenintegration und -verwaltung sowie die ebenfalls serverseitige Bilderzeugung. Mit diesem durchgehend serverseitigen Ansatz können sehr große Mengen an 3D-Geodaten auch auf solchen Endgeräte bereitgestellt werden, die nicht über ausreichend Speicher und Rechenleistung für die Vorhaltung, die Verarbeitung und das Rendering von 3D-Modellen verfügen. Der entwickelte WVS ermöglicht so u.a. auch auf Tablet-PCs und im Webbrowser die interaktive Erkundung und Analyse von 3D-Geodaten. Anhand einer Referenzimplementierung des WVS und einer Client-Anwendung wird die praktische Anwendung des WVS demonstriert. Im Bereich der Komposition von Web View Services wird untersucht, wie der WVS als Baustein einer komplexen, verteilten Visualisierungs- und Renderingpipeline eingesetzt werden kann. Durch die Komposition des WVS mit anderen Darstellungs- und Verarbeitungsservices können z. B. komplexe Renderingeffekte erzielt oder einzelne 3D-Objekte nachträglich in eine 3D-Ansicht integriert werden. Hierzu wird ein Konzept zur servicebasierten, Tiefenbildbasierten Bildkomposition beschrieben und am Beispiel der verdeckungsfreien Annotation von 3D-Ansichten umgesetzt und demonstriert. Im Bereich der Interaktion mit Web View Services liefert diese Arbeit Grundlagen, Konzept und Umsetzung für intelligente, assistierende und automatisierte Interaktions- und Navigationstechniken, die auf dem Angebotscharakter (der Affordanz) von 3D-Szenenobjekten sowie auf der skizzen- und gestenbasierten Eingabe von Nutzerintentionen basiert. Diese Eingaben werden hinsichtlich ihrer Form und unter Berücksichtigung der Semantik der 3DSzenenobjekte ausgewertet und interpretiert und anschließend in anwendungsspezifische Navigationskommandos übersetzt, aus denen teilautomatische Kamerafahrten abgeleitet werden.
Scalable Multi-Platform Distribution of Spatial 3D Contents.Klimke, Jan; Hagedorn, Benjamin; Döllner, Jürgen in International Journal of 3-D Information Modeling, (U. Isikdag, red.) (2014). 3(3) 35-49.
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HerausgeberIsikdag, U.
URNhttp://dx.doi.org/10.4018/ij3dim.2014070103
AbstractVirtual 3D city models provide powerful user interfaces for communication of 2D and 3D geoinformation. Providing high quality visualization of massive 3D geoinformation in a scalable, fast, and cost efficient manner is still a challenging task. Especially for mobile and web-based system environments, software and hardware configurations of target systems differ significantly. This makes it hard to provide fast, visually appealing renderings of 3D data throughout a variety of platforms and devices. Current mobile or web-based solutions for 3D visualization usually require raw 3D scene data such as triangle meshes together with textures delivered from server to client, what makes them strongly limited in terms of size and complexity of the models they can handle. This paper introduces a new approach for provisioning of massive, virtual 3D city models on different platforms namely web browsers, smartphones or tablets, by means of an interactive map assembled from artificial oblique image tiles. The key concept is to synthesize such images of a virtual 3D city model by a 3D rendering service in a preprocessing step. This service encapsulates model handling and 3D rendering techniques for high quality visualization of massive 3D models. By generating image tiles using this service, the 3D rendering process is shifted from the client side, which provides major advantages: a The complexity of the 3D city model data is decoupled from data transfer complexity b the implementation of client applications is simplified significantly as 3D rendering is encapsulated on server side c 3D city models can be easily deployed for and used by a large number of concurrent users, leading to a high degree of scalability of the overall approach. All core 3D rendering techniques are performed on a dedicated 3D rendering server, and thin-client applications can be compactly implemented for various devices and platforms.
Web-based and Mobile Provisioning of Virtual 3D Reconstructions.Klimke, J.; Hagedorn, B.; Trapp, M.; Döllner, J. (2014). 17--28.
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URNhttp://dx.doi.org/10.13140/RG.2.1.1087.7202
Service-Based 3D Rendering and Interactive 3D Visualization.Hagedorn, Benjamin; Döllner, Jürgen in HPI Future SOC Lab: Proceedings 2013, C. Meinel, Polze, A., Oswald, G., Strotmann, R., Seibold, U., Schulzki, B. (reds.) (2014). 3-5.
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HerausgeberMeinel, Christoph and Polze, Andreas and Oswald, Gerhard and Strotmann, Rolf and Seibold, Ulrich and Schulzki, Bernhard
Service-Based 3D Rendering and Interactive 3D Visualization (2012).Hagedorn, Benjamin; Döllner, Jürgen in HPI Future SOC Lab: Proceedings 2012, C. Meinel, Polze, A., Oswald, G., Strotmann, R., Seibold, U., Bernhard, S. (reds.) (2014). 7-10.
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HerausgeberMeinel, Christoph and Polze, Andreas and Oswald, Gerhard and Strotmann, Rolf and Seibold, Ulrich and Bernhard, Schulzki
AbstractThis report describes the subject and preliminary results of our work in the context of the HPI Future SOC Lab, which generally aims on how to exploit high performance computing (HPC) capabilities for service-based 3D rendering and service‐based, interactive 3D visualization. A major focus is on the application of HPC technologies for the creation, management, analysis, and visualization of and interaction with virtual 3D environments, especially with complex 3D city models.
Web-based and Mobile Provisioning of Virtual 3D Reconstructions.Klimke, Jan; Hagedorn, Benjamin; Trapp, Matthias; Döllner, Jürgen R. Franken-Wendelstorf, Lindinger, E., Sieck, J. (reds.) (2014). 17--28.
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HerausgeberFranken-Wendelstorf, R. and Lindinger, E. and Sieck, J.
AbstractCommunication of cultural heritage by means of digital information systems has been gaining more and more importance over recent years. Interactive virtual 3D applications enable users to explore 3D virtual reconstructions in real-time, to directly interact with the contained digital cultural heritage artifacts, and to obtain insights into this data. Nevertheless, these artifacts are usually very detailed and complex 3D models that are hard to handle for end-user systems. This paper presents the concept and a prototypical implementation of an image-based, web-based approach for the communication of digital cultural heritage and its provisioning for the Web and mobile devices by the example of the project Colonia3D – a high-detail, virtual reconstruction and high-detail 3D city model of Roman Cologne. Through this web-based and mobile provisioning, complex digital reconstructions can be used, e.g., on-site to match local findings and reconstructions.
Scalable Multi-Platform Distribution of Spatial 3D Contents.Klimke, Jan; Hagedorn, Benjamin; Döllner, Jürgen in International Journal of 3-D Information Modeling (2014). 3(3) 35--49.
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URNhttp://dx.doi.org/10.4018/ij3dim.2014070103
AbstractVirtual 3D city models provide powerful user interfaces for communication of 2D and 3D geoinformation. Providing high quality visualization of massive 3D geoinformation in a scalable, fast, and cost efficient manner is still a challenging task. Especially for mobile and web-based system environments, software and hardware configurations of target systems differ significantly. This makes it hard to provide fast, visually appealing ren-derings of 3D data throughout a variety of platforms and devices. Current mobile or web-based solutions for 3D visualization usually require raw 3D scene data such as triangle meshes together with textures delivered from server to client, what makes them strongly limited in terms of size and complexity of the models they can handle. This paper introduces a new approach for provisioning of massive, virtual 3D city models on different platforms namely web browsers, smartphones or tablets, by means of an interactive map assembled from artificial oblique image tiles. The key concept is to synthesize such images of a virtual 3D city model by a 3D rendering service in a preprocessing step. This service encapsulates model handling and 3D rendering techniques for high quality visualization of massive 3D models. By generating image tiles using this service, the 3D rendering process is shifted from the client side, which provides major advantages: (a) The complexity of the 3D city model data is decoupled from data transfer complexity (b) the implementation of client applica-tions is simplified significantly as 3D rendering is encapsulated on server side (c) 3D city models can be easily deployed for and used by a large number of concurrent users, leading to a high degree of scalability of the overall approach. All core 3D rendering techniques are performed on a dedicated 3D rendering server, and thin-client applications can be compactly implemented for various devices and platforms.
A Service-Based Concept for Camera Control in 3D Geovirtual Environments.Klimke, Jan; Hagedorn, Benjamin; Döllner, Jürgen in Lecture Notes in Geoinformation and Cartography, J. Pouliot, Daniel, S., Hubert, F., Zamyadi, A. (reds.) (2013). 101--118.
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HerausgeberPouliot, Jacynthe and Daniel, Sylvie and Hubert, Frédéric and Zamyadi, Alborz
URNhttp://dx.doi.org/10.1007/978-3-642-29793-9_6
Scalable Multi-Platform Distribution of Spatial 3D Contents.Klimke, Jan; Hagedorn, Benjamin; Döllner, Jürgen in ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences (2013). II-2/W1 193--200.
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URNhttp://dx.doi.org/10.5194/isprsannals-II-2-W1-193-2013
Server-Based Rendering of Large 3D Scenes for Mobile Devices Using G-Buffer Cube Maps.Döllner, Jürgen; Hagedorn, Benjamin; Klimke, Jan (2012). 97-100.
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URNhttp://dx.doi.org/10.1145/2338714.2338729
AbstractLarge virtual 3D scenes play a major role in growing number of applications, systems, and technologies to effectively communicate complex spatial information. Their web-based provision, in particular on mobile devices, represents a key challenge for system and application development. In contrast to approaches based on streaming 3D scene data to clients, our approach splits 3D rendering into two processes: A server process is responsible for realtime rendering of virtual panoramas, represented by G-buffer cube maps, for a requested camera setting. The client reconstruction process uses these cube maps to reconstruct the 3D scene and allows users to operate on and interact with that representation. The key properties of this approach include that (a) the complexity of transmitted data not depend on the 3D scene’s complexity, (b) 3D rendering can take place within a controlled and a-priori known server environment, (c) crucial 3D model data never leaves the server environment, and (d) the clients can flexibly extend the 3D cube map viewer by adding both local 3D models and specialized 3D operations.
A Service-Oriented Platform for Interactive 3D Web Mapping.Klimke, Jan; Hagedorn, Benjamin; Döllner, Jürgen (2012).
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AbstractDesign, implementation, and operation of interactive 3D map services are faced with a large number of challenges including (a) processing and integration of massive amounts of heterogeneous and distributed 2D and 3D geodata such as terrain models, buildings models, and thematic georeferenced data, (b) assembling, styling, and rendering 3D map contents according to application requirements and design principles, and (c) interactive provisioning of created 3D maps on mobile devices and thin clients as well as their integration as third-party components into domain-specific web and information systems. This paper discusses concept and implementation of a service-oriented platform that addresses these major requirements of 3D web mapping systems. It is based on a separation of concerns for data management, 3D rendering, application logic, and user interaction. The main idea is to divide 3D rendering process into two stages. In the first stage, at the server side, we construct an image-based, omni-directional approximation of the 3D scene by means of multi-layered virtual 3D panoramas, in the second stage, at the client side, we interactively reconstruct the 3D scene based on the panorama. We demonstrate the prototype implementation for real-time 3D rendering service and related iOS 3D client applications. In our case study, we show how to interactively visualize a complex, large-scale 3D city model based on our service-oriented platform.
Server-based rendering of large 3D scenes for mobile devices using G-buffer cube maps.Doellner, Jürgen; Hagedorn, Benjamin; Klimke, Jan in Web3D '12 (2012). 97--100.
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URNhttp://dx.doi.org/10.1145/2338714.2338729
OGC 3D Portrayal Interoperatiliy Experiment Final Report. Technical Report (OGC 12-075), Schilling, Arne; Hagedorn, Benjamin; Coors, Volker (2012).
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HerausgeberSchilling, Arne and Hagedorn, Benjamin and Coors, Volker
AbstractThis report describes the setup, experiments, results and issues generated by the 3D Portrayal Interoperability Experiment (3DPIE), carried out as an activity of the 3D Information Management Domain Working Group (3DIM). The 3DPIE is designed to test and demonstrate different approaches for service-based 3D portrayal based on the drafts for the candidate standards for 3D portrayal, Web 3D Service (W3DS) and Web View Service (WVS). This document [...] contains technical details on processing 3D information in an OGC service environment as well as best practices on how to portray large data sets in urban planning scenarios, taking into account architectures and capabilities of interactive 3D graphics. Especially Web 3D Service and Web View Service, two draft standards (published as OGC discussions paper), have been in the focus of 3DPIE.
A Service-Based Concept for Camera Control in 3D Geovirtual Environments.Klimke, Jan; Hagedorn, Benjamin; Döllner, Jürgen (2012).
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Abstract3D geovirtual environments (3D GeoVEs) such as virtual 3D city models serve as integration platforms for complex geospatial information and facilitate effective use and communication of that information. Recent developments towards standards and service-based, interactive 3D geovisualization systems enable the large-scale distribution of 3D GeoVEs also by thin client applications that work on mobile devices or in web browsers. To construct such systems, 3D portrayal services can be used as building blocks for service-based rendering. Service-based approaches for 3D user interaction, however, have not been formalized and specified to a similar degree. In this paper, we present a concept for service-based 3D camera control as a key element of 3D user interaction used to explore and manipulate 3D GeoVEs and their objects. It is based on the decomposition of 3D user interaction functionality into a set of services that can be flexibly combined to build automated, assisting, and application-specific 3D user interaction tools, which fit into service-oriented architectures of GIS and SDI based IT solutions. We discuss 3D camera techniques, categories of 3D camera tasks, and derive a collection of general-purpose 3D interaction services. We also explain how to eficiently compose these services and discuss their impact on the architecture of service-based visualization systems. Furthermore, we outline an example of a distributed 3D geovisualization system that shows how the concepts can be applied applications based on virtual 3D city models.
Image-based strategies for interactive visualisation of complex 3D geovirtual environments on lightweight devices.Hildebrandt, Dieter; Hagedorn, Benjamin; Döllner, Jürgen in Journal of Location Based Services (2011). 5(2) 100-120.
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URNhttp://dx.doi.org/10.1080/17489725.2011.580787
AbstractIn this article, we present strategies for service-oriented, standards and image-based 3D geovisualisation that have the potential to provide interactive visualisation of complex 3D geovirtual environments (3DGeoVE) on lightweight devices. In our approach, interactive geovisualisation clients retrieve sets of 2D images of projective views of 3DGeoVEs generated by a 3D rendering service. As the key advantage of the image-based approach, the complexity that a client is exposed for displaying a visual representation is reduced to a constant factor primarily depending on the image resolution. To provide users with a high degree of interactivity, we propose strategies that are based on additional service-side functionality and on exploiting multiple layers of information encoded into the images for the local reconstruction of visual representations of the remote 3DGeoVE. The use of service-orientation and standards facilitates designing distributed 3D geovisualisation systems that are open, interoperable and can easily be adapted to changing requirements. We demonstrate the validity of the proposed strategies by presenting proof-of-concept implementations of several image-based 3D clients for the case of virtual 3D city models.
Image-Based Strategies for Interactive Visualization of Complex 3D Geovirtual Environments on Lightweight Devices.Hildebrandt, Dieter; Hagedorn, Benjamin; Döllner, in Journal of Location Based Services (JLBS) (2011). 5(2) 100--120.
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AbstractIn this article, we present strategies for service-oriented, standards and image-based 3D geovisualisation that have the potential to provide interactive visualisation of complex 3D geovirtual environments (3DGeoVE) on lightweight devices. In our approach, interactive geovisualisation clients retrieve sets of 2D images of projective views of 3DGeoVEs generated by a 3D rendering service. As the key advantage of the image-based approach, the complexity that a client is exposed for displaying a visual representation is reduced to a constant factor primarily depending on the image resolution. To provide users with a high degree of interactivity, we propose strategies that are based on additional service-side functionality and on exploiting multiple layers of information encoded into the images for the local reconstruction of visual representations of the remote 3DGeoVE. The use of service-orientation and standards facilitates designing distributed 3D geovisualisation systems that are open, interoperable and can easily be adapted to changing requirements. We demonstrate the validity of the proposed strategies by presenting proof-of-concept implementations of several image-based 3D clients for the case of virtual 3D city models.
Service-Oriented Interactive 3D Visualization of Massive 3D City Models on Thin Clients.Hildebrandt, Dieter; Klimke, Jan; Hagedorn, Benjamin; Döllner, Jürgen in 2nd Int. Conference on Computing for Geospatial Research & Application COM.Geo 2011 (2011).
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URNhttp://dx.doi.org/10.1145/1999320.1999326
AbstractVirtual 3D city models serve as integration platforms for complex geospatial and georeferenced information and as medium for effctive communication of spatial information. In this paper, we present a system architecture for service-oriented, interactive 3D visualization of massive 3D city models on thin clients such as mobile phones and tablets. It is based on high performance, server-side 3D rendering of extended cube maps, which are interactively visualized by corresponding 3D thin clients. As key property, the complexity of the cube map data transmitted between server and client does not depend on the model's complexity. In addition, the system allows the integration of thematic raster and vector geodata into the visualization process. Users have extensive control over the contents and styling of the visual representations. The approach provides a solution for safely, robustly distributing and interactively presenting massive 3D city models. A case study related to city marketing based on our prototype implementation shows the potentials of both server-side 3D rendering and fully interactive 3D thin clients on mobile phones.
Integrating 3D Data in Service-based Visualization Systems.Klimke, Jan; Hildebrandt, Dieter; Hagedorn, Benjamin; Döllner, Jürgen (2011).
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URNhttp://dx.doi.org/10.1145/1999320.1999395
AbstractGeoreferenced data is available from a wide range of sources, e.g., Directory Services, Sensor Observation Services, Web Feature Services or even proprietary interfaces. Many of the data originating from an Internet of things will be threedimensional representing outdoor as well as indoor geographic features and their properties. Based on this data, its integration, and its visualization totally new applications and systems could be designed and implemented supporting various applications domains. Recent work in the area of service-based 3D visualization enables high-quality visualization of complex 3D geodata, e.g., 3D city models and 3D indoor building models, on thin clients as well as mobile devices such as smartphones and tablets. This work uses a service-based, image-based visualization approach that decouples the server-side resource-intensive management and rendering of complex, massive 3D geodata from client-side display functionalities: A Web View Service provides image representations of a 3D scene, these images, which can contain different types of information per pixel, are transmitted to a client application that can reconstruct a 3D representation of this scene. – In this talk, we will describe how to combine 3D geodata originating from the Internet of Things with this service-based approach in a way that allows for the interactive exploration of and interaction with 3D worlds and objects of interest. In detail, this 3D geodata can be integrated into the visualization process a) at the rendering stage of a portrayal service, b) through an image post processing step or c) in the client application itself. Moreover, this data can be visually represented directly by modifying the appearance of existing features, e.g., for visualizing measurements, or indirectly by introducing additional objects, e.g., icons, into the 3D scene. We will discuss advantages and disadvantages of these different approaches for implementing visualization applications using live geodata sources.
Service-oriented interactive 3D visualization of massive 3D city models on thin clients.Hildebrandt, Dieter; Klimke, Jan; Hagedorn, Benjamin; Döllner, Jürgen (2011). 1--1.
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URNhttp://dx.doi.org/10.1145/1999320.1999326
Service-Based, Interactive Portrayal of 3D Geovirtual Environments.Hagedorn, Benjamin in Proceedings of the 4th Ph.D. Retreat of the HPI Research School on Service-oriented Systems Engineering, C. Meinel, Plattner, H., Döllner, J., Weske, M., Polze, A., Hirschfeld, R., Naumann, F., Giese, H. (reds.) (2010). 13:1--13:10.
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HerausgeberMeinel, Christoph and Plattner, Hasso and Döllner, Jürgen and Weske, Mathias and Polze, Andreas and Hirschfeld, Robert and Naumann, Felix and Giese, Holger
AbstractThis report summarizes my work in the HPI Research School on Service Oriented Systems Engineering. It motivates and points out the underlying research questions in the field of service-based 3D portrayal of large and complex 3D geovirtual envi- ronments, presents my approach to solving these questions, and demonstrates and highlights results by example. A focus is on my work during the past months.
Image-Based, Interactive Visualization of Complex 3D Geovirtual Environments on Lightweight Devices.Hildebrandt, Dieter; Hagedorn, Benjamin; Döllner, Jürgen (2010).
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AbstractIn this paper, we present strategies for service-oriented, standards and image-based 3D geovisualization that have the potential to provide interactive vi-sualization of complex 3D geovirtual environments (3DGeoVE) on lightweight devices. In our approach, interactive geovisualization clients retrieve sets of 2D images of projective views of 3DGeoVEs generated by a 3D rendering service. As the key advantage of the image-based approach, the complexity that a client is exposed to for displaying a visual representation is reduced to a constant factor primarily depending on the image resolution. To provide users with a high degree of interactivity, we propose strategies that are based on additional service-side functionality and on exploiting multiple layers of information encoded into the images for the local reconstruction of visual representations of the remote 3DGeoVE. The use of service-orientation and standards facilitates designing distributed 3D geovisualization systems that are open, interoperable and can easily be adapted to changing requirements. We demonstrate the validity of the proposed strategies by presenting several image-based 3D clients for the case of virtual 3D city models.
Towards Advanced and Interactive Web Perspective View Services.Hagedorn, Benjamin; Hildebrandt, Dieter; Döllner, Jürgen in Developments in 3D Geo-Information Sciences (2010). 33--51.
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AbstractThe Web Perspective View Service (WPVS) generates 2D images of perspective views of 3D geovirtual environments (e.g., virtual 3D city models) and represents one fundamental class of portrayal services. As key advantage, this image-based approach can be deployed across arbitrary networks due to server-side 3D rendering and 3D model management. However, restricted visualization and interaction capabilities of WPVS-based applications represent its main weaknesses. To overcome these limitations, we present the concept and an implementation of the WPVS++, a WPVS extension, which provides A) additional thematic information layers for generated images and B) additional service operations for requesting spatial and thematic information. Based on these functional extensions, WPVS++ clients can implement various 3D visualization and interaction features without changing the underlying working principle, which leads to an increased degree of interactivity and is demonstrated by prototypic web-based client applications.
Web View Service Discussion Paper, Version 0.3.0, OGC 09-166r2.Hagedorn, Benjamin (2010).
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HerausgeberHagedorn, Benjamin
Sketch-based Navigation in 3D Virtual Environments.Hagedorn, Benjamin; Döllner, Benjamin in it - Information Technology, (P. Molitor, red.) (2009). 51(3) 163--170.
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HerausgeberMolitor, Paul
URNhttp://dx.doi.org/10.1524/itit.2009.0537
AbstractThe declarative design of graphics lies at the core of the Smart Graphics research agenda. For 3D graphics the number of lights included, and the properties of these lights, has an enormous impact on what a viewer can judge about the content (the objects), properties (the geometric characteristics and spatial relations of the objects) and other aesthetic qualities of a scene. The traditional approach to lighting design for image synthesis is based on manual design methods, whereby users interactively specify values of lighting parameters, render the scene, and modify the lighting parameters until the desired visual properties of the scene are achieved. Non-expert users encounter a number of difficulties in selecting the appropriate lighting parameters, as the process requires both a subtle technical and aesthetic understanding of lighting in computer graphics. We review range of “smart” lighting design and steady slow convergence on ideal lighting approaches which optimise the lighting configuration for a scene with respect to a set of absolute perceptual metrics. More recently perceptual approaches have been combined with aspects of exemplar driven approaches to yield “lighting-by-example” techniques that can replicate the lighting of existing static 2D images and 3D scenes.
Towards an indoor level-of-detail model for route visualization.Hagedorn, Benjamin; Trapp, Matthias; Glander, Tassilo; Döllner, Jürgen (2009). 692--697.
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URNhttp://dx.doi.org/10.1109/MDM.2009.118
Extending the WPVS Visualization and Interaction Capabilities.Hagedorn, Benjamin in Proceedings of the 3rd Ph.D. Retreat of the HPI Research School on Service-oriented Systems Engineering Fall 2008, C. Meinel, Plattner, H., Döllner, J., Weske, M., Polze, A., Hirschfeld, R., Naumann, F., Giese, H. (reds.) (2009). 1:1--1:16.
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HerausgeberMeinel, Christoph and Plattner, Hasso and Döllner, Jürgen and Weske, Mathias and Polze, Andreas and Hirschfeld, Robert and Naumann, Felix and Giese, Holger
AbstractA Web Perspective View Service (WPVS) provides images of perspective views of 3D geovirtual environments (3DGeoVE) which can be displayed by the service consumer without client-based 3D rendering. Such visualizations can be easily accessed by simple clients such as mobile devices and can be integrated into processes, e.g., for city planning or ad-hoc threat response applications. So far, the WPVS does not provide any interaction or navigation capabilities, which restricts its degree of usability. To increase the spectrum of the WPVS functionality and, thus, its usability and applicability, we present the concept of an extended, smart WPVS. The proposed extensions provide meta information for generated views and more effective 3D interaction and 3D navigation for service-based complex 3D geovirtual environments.
Sketch-Based Navigation in 3D Virtual Environments.Hagedorn, Benjamin; Döllner, Jürgen in it - Information Technology (2009). (3) 163--170.
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URNhttp://dx.doi.org/10.1524/itit.2009.0537
AbstractNavigation represents a fundamental interaction technique for 3D virtual environments (3DVEs) – it enables users to explore the virtual world and to interact with its objects. For this, effective navigation techniques are required that take into account users and their goals. They also should prevent common problems of 3D navigation, such as an intricate camera control or “getting-lost” situations due to incoherent and confusing camera views. Smart navigation aims at this category of navigation techniques, it represents a special type of smart interaction and, thus, an essential element of smart graphics. This article presents the conceptual building blocks of smart navigation for 3DVEs and describes a navigation technique that allows for specifying navigation commands by sketches and gestures: Users sketch their navigation intentions on top of the perspective projection of the 3D scene, the system interprets these sketches regarding the affected scene geometry, as well as the spatial and temporal context. Based on this interpretation, navigation activities are derived and automatically performed. By providing assistance and automation, the smart navigation approach can substantially simplify user interfaces for 3DVEs and, thus, represents an essential component for novel applications of 3DVEs, e.g., based on touch-sensitive displays.
Towards Advanced and Interactive Web Perspective View Services.Hagedorn, Benjamin; Hildebrandt, Dieter; Döllner, Jürgen in Lecture Notes in Geoinformation and Cartography (2009). 33--51.
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URNhttp://dx.doi.org/10.1007/978-3-642-04791-6
AbstractThe Web Perspective View Service (WPVS) generates 2D images of perspective views of 3D geovirtual environments (e.g., virtual 3D city models) and represents one fundamental class of portrayal services. As key advantage, this image-based approach can be deployed across arbitrary networks due to server-side 3D rendering and 3D model management. However, restricted visualization and interaction capabilities of WPVS-based applications represent its main weaknesses. To overcome these limitations, we present the concept and an implementation of the WPVS++, a WPVS extension, which provides A) additional thematic information layers for generated images and B) additional service operations for requesting spatial and thematic information. Based on these functional extensions, WPVS++ clients can implement various 3D visualization and interaction features without changing the underlying working principle, which leads to an increased degree of interactivity and is demonstrated by prototypic web-based client applications.
Towards an Indoor Level-of-Detail Model for Route Visualization.Hagedorn, Benjamin; Trapp, Matthias; Glander, Tassilo; Döllner, Jürgen (2009). 692--697.
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URNhttp://dx.doi.org/10.1109/MDM.2009.118
AbstractIndoor routing represents an essential feature required by applications and systems that provide spatial information about complex sites, buildings and infrastructures such as in the case of visitor guidance for trade fairs and customer navigation at airports or train stations. Apart from up-to-date, precise 3D spatial models these systems and applications need user interfaces as core system components that allow users to efficiently express navigation goals and to effectively visualize routing information. For interoperable and flexible indoor routing systems, common specifications and standards for indoor structures, objects, and relationships are needed as well as for metadata such as data quality and certainty. In this paper, we introduce a classification of indoor objects and structures taking into account geometry, semantics, and appearance, and propose a level-of-detail model for them that supports the generation of effective indoor route visualization.
Service-Based Virtual 3D City Models.Hagedorn, Benjamin in Proceedings of the 3rd Ph.D. Retreat of the HPI Research School on Service-oriented Systems Engineering Fall 2008, M. Diehl, Lipskoch, H., Mayer, R., Storm, C. (reds.) (2008).
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HerausgeberDiehl, Malte and Lipskoch, Henri and Mayer, Roland and Storm, Christian
Styling for Service-Based 3D Geovisualization.Hagedorn, Benjamin in Proceedings of the 2nd. Ph.D. retreat of the HPI Research School on Service-oriented Systems Engineering, C. Meinel (red.) (2008). 1:1-1:22.
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HerausgeberMeinel, Christoph
AbstractStyling geovisualizations means to control the geovisualization process, i.e., to define which geoinformation to include and how to visualize them. It is a crucial aspect for enabling flexible and adaptable geovisualization systems and applications as it allows authors and users to influence the visual appearance of the geovisualization and so to adapt it to specific tasks and preferences. Especially for the service-based implementation of geovisualization systems, it has to be specified how a service consumer can define the visual appearance of a geovisualization which might base on distributed heterogeneous geoinformation and might be synthesized by the combination of independent geovisualization services. This paper describes the styling of three-dimensional geovisualizations in two scenarios. First, a Web Perspective View Service (WPVS) for the generation of high-quality visualization of domain specific building information within its GIS context is described. Second, the Web View Annotation Service (WVAS) and its combination with a WPVS for the synthesis of textual annotated views are introduced. Both implementations are demonstrated for a 3D campus model.
Sketch-Based Navigation in 3D Virtual Environments.Hagedorn, Benjamin; Döllner, Jürgen in Lecture Notes in Computer Science (2008). 239--246.
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AbstractNavigation represents the fundamental interaction technique in 3D virtual environments (3D VEs) as it enables the users to explore the 3D world and to interact with its objects. Efficient navigation strategies and techniques are required, which take account of the users and their goals and avoid problems of general navigation methods, such as ''getting-lost'' situations and confusing view configurations. This paper presents a novel method for specifying and controlling navigation in 3D VEs based on sketching navigation commands. The users sketch their navigation intentions on top of the perspective projection of the 3D scene. The system interprets these sketches regarding their geometry, spatial context, and temporal context. Unlike other sketchy navigation techniques, our approach identifies the hit objects of the underlying 3D scene and takes advantage of their semantics and inherent navigation affordances. The approach has been prototypically implemented for the exploration of a virtual 3D city model with a touch-sensitive display.
Welten verbinden - Virtuelle 3D-Stadtmodelle im OGC-Projekt OWS-4.Döllner, Jürgen; Hagedorn, Benjamin in GIS Business - Geoinformationstechnologie für die Praxis (2007). (9) 14--17.
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AbstractVirtuelle 3D-Stadtmodelle bieten einen konzeptionellen und technischen Rahmen um unabhängige, heterogene und verteilte raumbezogene Daten situations- und aufgabengetrieben effizient zu integrieren und effektiv zu nutzen. Im OGC-Projekt OWS-4 wurde dies demonstriert.
Chaining Geoinformation Services for the Visualization and Annotation of 3D Geovirtual Environments.Hagedorn, Benjamin; Maass, Stefan; Döllner, Jürgen (2007).
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AbstractVisualization of 3D geovirtual environments enables users to gain insight into and to interactively operate with complex 3D geoinformation as well as to explore and analyze underlying structures, relationships, and associated thematic georeferenced data. It represents a key functionality for a growing number of applications and systems such as for way-finding, urban city planning, geo-marketing, and tourist information. For the systematic implementation of these systems, geoinformation services provide an interoperable and standardized way to access, process, and view distributed, heterogeneous 2D and 3D geospatial data. To broaden the use and scope of 3D geovirtual environments, we have to support the management and visualization of user-defined or application-defined data associated with geospatial objects. For this purpose, we can embed annotations such as texts or symbols as meta elements into images of 3D geovirtual environments. For example, annotations can represent georeferenced comments added interactively by the user to explicitly denote spatial objects and locations the comments refer to. This paper presents the design of a chain of web services for the creation of annotated perspective views. First, a Web Perspective View Service (WPVS) is outlined that synthesizes images of a given 3D geovirtual environment and delivers the images to the service consumer. Second, the Web View Annotation Service (WVAS) is introduced that processes these images as input along with a set of spatial locations and content definitions. To ensure high legibility, annotations are embedded into the view plane and placed such that they avoid occlusions among themselves and with geospatial objects of the scene. As result of this service composition, the service consumer receives an enhanced image depicting the current perspective view with seamlessly embedded annotations. We describe the design and system architecture by the example of a prototypic interactive campus information system.
High-Level Web Service for 3D Building Information Visualization and Analysis.Hagedorn, Benjamin; Döllner, Jürgen (2007). 1--8.
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AbstractThis paper presents an approach to visualize and analyze 3D building information models within virtual 3D city models. Building information models (BIMs) formalize and represent detailed information related to the lifecycle of buildings, e.g., information about composition, facilities, equipment, usage, maintenance, and workflows such as rescue scenarios. Complementary, virtual 3D city models represent objects and phenomena of urban areas, typically at a lower level of information detail, virtual 3D city models as a general framework and platform for spatial data allow us to seamlessly combine GIS and BIM data. In our approach, BIM data and 3D geodata, both provided by possibly distributed, heterogeneous web services, are efficiently integrated by the underlying real-time 3D geovisualization system. To facilitate insights into complex spatial scenarios, two configurable BIM-specific visualization techniques have been developed, which map BIM data onto 3D building graphics variables respectively geometrically distort 3D building representations. The visualization functionality can itself be accessed as a specialized web 3D perspective view service. We demonstrate our approach by a fire and rescue scenario for a part of a 3D campus model.
Integrating Urban GIS, CAD, and BIM Data By Service-Based Virtual 3D City-Models.Döllner, Jürgen; Hagedorn, Benjamin M. Rumor, Coors, V., Fendel, E. M., Zlatanova, S. (reds.) (2007). 157--170.
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HerausgeberRumor, Massimo and Coors, Volker and Fendel, Elfriede M. and Zlatanova, Sisi
AbstractIn this paper we describe how urban data from different system and application domains such as Computer Aided Design (CAD), Geographic Information Systems (GIS), and Building Information Models (BIM) can be integrated by a service-based virtual 3D city model system. The 3D viewer client allows users to access, to import, and to integrate semantic-enhanced information models from the CAD, GIS, and BIM domain that are provided within a service-based geodata infrastructure. The 3D viewer client represents the core component that implements a number of adaptors for various OGC web service types, manages the resulting virtual 3D city model based on CityGML, and can act itself as a higher-level service delivering integrated information. This approach shows how urban data from different scales, different domains, and different stakeholders can be seamlessly integrated at visualization level and how corresponding services can be setup. The work is based on our development of an interoperable 3D viewer client within the CAD/GIS/BIM thread of the Web Services Initiative Phase 4 of the Open Geospatial Consortium.
Proceedings of the Fall 2006 Workshop of the HPI Research School on Service-Oriented Systems EngineeringHagedorn, Benjamin; Schöbel, Michael; Uflacker, Matthias; Copaciu, Flavius; Milanovic, Nikola in Technische Berichte des Hasso-Plattner-Instituts für Softwaresystemtechnik an der Universität Potsdam (2007). (Vol. 18) Universitätsverlag Potsdam.
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Chaining Geoinformation Services for the Visualisation and Annotation of 3D Geovirtual Environments.Hagedorn, Benjamin; Maass, Stefan; Döllner, J (2007).
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AbstractVisualization of 3D geovirtual environments enables users to gain insight into and to interactively operate with complex 3D geoinformation as well as to explore and analyze underlying structures, relationships, and associated thematic georeferenced data. It represents a key functionality for a growing number of applications and systems such as for way-finding, urban city planning, geo- marketing, and tourist information. For the systematic implementation of these systems, geoinformation services provide an interoperable and standardized way to access, process, and view distributed, heterogeneous 2D and 3D geospatial data. To broaden the use and scope of 3D geovirtual environments, we have to support the management and visualization of user-defined or application-defined data associated with geospatial objects. For this purpose, we can embed annotations such as texts or symbols as meta elements into images of 3D geovirtual environments. For example, annotations can represent georeferenced comments added interactively by the user to explicitly denote spatial objects and locations the comments refer to. This paper presents the design of a chain of web services for the creation of annotated perspective views. First, a Web Perspective View Service (WPVS) is outlined that synthesizes images of a given 3D geovirtual environment and delivers the images to the service consumer. Second, the Web View Annotation Service (WVAS) is introduced that processes these images as input along with a set of spatial locations and content definitions. To ensure high legibility, annotations are embedded into the view plane and placed such that they avoid occlusions among themselves and with geospatial objects of the scene. As result of this service composition, the service consumer receives an enhanced image depicting the current perspective view with seamlessly embedded annotations. We describe the design and system architecture by the example of a prototypic interactive campus information system.
High-level Web Service for 3D Building Information Visualization and Analysis.Hagedorn, Benjamin; Döllner, Jürgen in GIS '07 (2007). 8:1--8:8.
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URNhttp://dx.doi.org/10.1145/1341012.1341023
AbstractThis paper presents an approach to visualize and analyze 3D building information models within virtual 3D city models. Building information models (BIMs) formalize and represent detailed information related to the lifecycle of buildings, e.g., information about composition, facilities, equipment, usage, maintenance, and workflows such as rescue scenarios. Complementary, virtual 3D city models represent objects and phenomena of urban areas, typically at a lower level of information detail; virtual 3D city models as a general framework and platform for spatial data allow us to seamlessly combine GIS and BIM data. In our approach, BIM data and 3D geodata, both provided by possibly distributed, heterogeneous web services, are efficiently integrated by the underlying real-time 3D geovisualization system. To facilitate insights into complex spatial scenarios, two configurable BIM-specific visualization techniques have been developed, which map BIM data onto 3D building graphics variables respectively geometrically distort 3D building representations. The visualization functionality can itself be accessed as a specialized web 3D perspective view service. We demonstrate our approach by a fire and rescue scenario for a part of a 3D campus model.
Integrating urban GIS, CAD and BIM data by service-based virtual 3D city models.Döllner, Jürgen; Hagedorn, Benjamin in Urban and Regional Data Management: UDMS 2007 Annual, (M. Rumor; Coors, V.; Fendel, E. M.; Zlatanova, S., reds.) (2007). 157--160.
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HerausgeberRumor, Massimo and Coors, Volker and Fendel, Elfriede M. and Zlatanova, Sisi
AbstractIn this paper we describe how urban data from different system and application domains such as Computer Aided Design (CAD), Geographic Information Systems (GIS), and Building Information Models (BIM) can be integrated by a service-based virtual 3D city model system. The 3D viewer client allows users to access, to import, and to integrate semantic-enhanced information models from the CAD, GIS, and BIM domain that are provided within a service-based geodata infrastructure. The 3D viewer client represents the core component that implements a number of adaptors for various OGC web service types, manages the resulting virtual 3D city model based on CityGML, and can act itself as a higher-level service delivering integrated information. This approach shows how urban data from different scales, different domains, and different shareholders can be seamlessly integrated at visualization level and how corresponding services can be setup. The work is based on our development of an interoperable 3D viewer client within the CAD/GIS/BIM thread of the Web Services Initiative Phase 4 of the Open Geospatial Consortium.
An Approach towards Semantics-Based Navigation in 3D City Models on Mobile Devices.Döllner, Jürgen; Hagedorn, Benjamin; Schmidt, Steffen in Location Based Services and TeleCartography, G. Gartner, Cartwright, W., Peterson, M. P. (reds.) (2007). 357--368.
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HerausgeberGartner, Georg and Cartwright, William and Peterson, Michael P.
URNhttp://dx.doi.org/10.1007/978-3-540-36728-4_27
AbstractThis paper outlines a novel approach for user navigation in complex virtual 3D city models on mobile devices. Users navigate within the virtual 3D city model by sketching navigation commands in the perspective view on the mobile client. The sketches are sent to the server, which reprojects the sketches onto the 3D scene, interprets these sketches in terms of navigation commands, and sends the resulting video-encoded image stream to the mobile client. This approach allows us to provide interactivity for complex virtual 3D city models on resource and bandwidth limited mobile clients. A high degree of usability is achieved because users can trigger complex navigation commands in a task and goal oriented way taking advantage of the navigation properties and affordances inherent to elements of geovirtual environments.
Integration von GIS-, CAD- und BIM-Daten mit dienstbasierten virtuellen 3D-Stadtmodellen.Döllner, Jürgen; Hagedorn, Benjamin in GIS - Zeitschrift für Geoinformatik (2007). (11) 28--37.
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AbstractDieser Beitrag beschreibt wie urbane räumliche Daten aus verschiedenen Anwendungsdomänen wie dem Computer Aided Design (CAD), Geographischen Informationssystemen (GIS) und Bauwerksinformationssystemen (BIM) mit Hilfe eines virtuellen 3D-Stadtmodells innerhalb einer servicebasierten Systemarchitektur kombiniert und integriert werden können. Der Ansatz beruht auf einem 3D-Viewer für komplexe Stadtmodelle, der es dem Nutzer ermöglicht auf die verschiedenen, von einer dienstbasierten Geodateninfrastruktur bereitgestellten, urbanen Geodaten zuzugreifen, diese zu importieren und zu integrieren. Der 3D-Viewer enthält eine Reihe von Adaptern für verschiedenen OGC Web Services, verwaltet das kombinierte virtuelle 3D-Stadtmodell auf der Basis von CityGML und ermöglicht dem Benutzer die Exploration und Analyse dieser integrierten Daten. Der Ansatz zeigt, wie urbane Geodaten unterschiedlicher Herkunft und Granularität auf der Visualisierungsebene integriert werden können. Diese Arbeit beruht auf der Entwicklung eines interoperablen 3D-Viewer-Clients innerhalb des CAD/GIS/BIM-Threads der 4. Phase der Web Services Initiative (OWS-4) des Open Geospatial Consortiums.
Design and Composition of 3D Geoinformation Services.Hagedorn, Benjamin in Proceedings of the Fall 2006 Workshop of the HPI Research School on Service-Oriented Systems Engineering (2007). 1:1-1:22.
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AbstractForced by Google Earth the topic of geoinformation has become mainstream. As 80 per cent of all digital information carries a spatial reference, there is a great opportunity for using geographic information as a basis for gaining insight into these data, for more efficient processing, and for developing new applications on the basis of such information. Especially 3D geoinformation gets more and more important for a variety of application domains. For enabling the interoperable access and processing of geoinformation, standards organizations as the Open Geospatial Consortium have specified different services and data description languages. This work gives an introduction to the field of 3D geoinformation services and points out open questions that arise from using geoservices. The focus is on the visualization aspects and the consequences for service design and integration with existing and future geoservice-based systems.
Landschafts- und Stadtmetaphern zur Softwarevisualisierung.Hagedorn, Benjamin in Konzepte der Softwarevisualisierung für komplexe, objektorientierte Softwaresysteme, J. Bohnet, Döllner, J. (reds.) (2005). 59--72.
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HerausgeberBohnet, Johannes and Döllner, Jürgen
AbstractSoftwaresysteme sind sehr komplexe Systeme und wegen ihrer intangibelen Natur oft nur schwer begreifbar. Im Bereich der Informationsvisualisierung existieren viele Ansätze um die Entwicklung und Wartung von Software durch eine angemessene Darstellung zu unterstützen. Eine besondere Bedeutung für diese Darstellung können Metaphern haben, da sie die vielfältigen und hochkomplexen Informationen über das Softwaresystem in einer für den Benutzer intuitiven Form darzustellen versuchen. Dieser Artikel gibt einen Überblick über die Verwendung der Landschaftsmetapher und der Stadtmetapher zur Softwarevisualisierung. Wir beschäftigen uns mit den Elementen der Metaphern und der Abbildung der Informationen auf diese. Außerdem werden weitere Aspekte wie die angemessene Orientierungsunterstützung und Navigation betrachtet. An verschiedenen Beispielen wird der Stand der Forschung auf diesem Bereich dargestellt und diskutiert.
An Approach towards Semantics-Based Navigation in 3D City Models on Mobile Devices.Döllner, Jürgen; Hagedorn, Benjamin; Schmidt, Steffen in Schriftenreihe der Studienrichtung Vermessungswesen und Geoinformation an der TU Wien, G. Gartner (red.) (2005). 171--176.
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HerausgeberGartner, Georg
AbstractThis paper outlines a novel approach for user navigation in complex virtual 3D city models on mobile devices. Users navigate within the virtual 3D city model by sketching navigation commands in the perspective view on the mobile client. The sketches are sent to the server, which reprojects the sketches onto the 3D scene, interprets these sketches in terms of naviga-tion commands, and sends the resulting video-encoded image stream to the mobile client. This approach allows us to provide interactivity for complex virtual 3D city models on resource and bandwidth limited mobile clients. A high degree of usability is achieved because users can trigger complex navigation commands in a task and goal oriented way taking advantage of the navigation properties and affordances inherent to elements of geovirtual environments.
CodeCrawler in der Anwendung.Hagedorn, Benjamin in Konzepte der Softwarevisualisierung für komplexe, objektorientierte Softwaresysteme, J. Bohnet, Döllner, J. (reds.) (2005). 39--46.
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HerausgeberBohnet, Johannes and Döllner, Jürgen
Konzepte der Softwarevisualisierung für komplexe, objektorientierte Softwaresysteme. Technical Report (6), Bohnet, Johannes; Brinkmann, Daniel; Döllner, Jürgen; Gierak, Alexander; Hagedorn, Benjamin; Lazic, Nebojsa; Schöbel, Michael (J. Bohnet; Döllner, J., reds.) (2005).
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HerausgeberBohnet, Johannes and Döllner, Jürgen

Professional Activities

GEOkomm Verband der GeoInformationswirtschaft Berlin/Brandenburg e.V.
Board member, Jun 2014 - Jun 2018
Open Geospatial Consortium,
Co-Chair of 3D Information Management (3DIM) Domain Working Group, Jun 2011 - Mar 2015
InnoProfile Research Group "3D Geoinformation" at University Potsdam
Lead, 2011

Teaching Activities

Lectures and Seminars

Winter 2017/2018: Master Seminar "Information Visualisation Techniques for Industrie 4.0"
Summer 2017: Bachelor Seminar "Einführung Informationsvisualisierung"
Winter 2016/17: Master Seminar "Methods and Techniques of Information Visualization"
Summer 2016: Bachelor Seminar "Einführung in Visual Analytics"
Winter 2015/16: Bachelor Seminar "Seminar Räumliche Daten und raumzeitliche Daten"
Summer 2015: Master Seminar "Spatial Analytics"
Winter 2014/15: Bachelor Seminar "Konstruktion virtueller 3D-Stadtmodelle"
Summer 2014: Master Seminar "Service-based Visualization"
Summer 2012/13: Master Seminar "Konzepte und Techniken der 3D-Visualisierung"
Winter 2011/12: Master Seminar "Realtime Rendering Techniques"
Summer 2011: Bachelor Project "Mobile 3D Apps"
Summer 2011: Master Lecture "Geovisualization"
Summer 2010: Bachelor Project "SOA-based 3D Geovisualization for Mobile Applications"
Summer 2010: Master Seminar on Information and Geo Visualization, Master Seminar on Software Engineering for Visualization Systems
Winter 2009/10: Master Seminar Visualization, Master Seminar on Service-oriented Computing
Summer 2009: Bachelor Project "Smartboard-based User-Interface for 3D City Models"
Summer 2008: Master Seminar "Visualization: Concepts and Methods"
Winter 2007/08: Master Seminar "Visualization"
Summer 2007: Master Lecture "Visualization", Master Seminar "Visualization"
Winter 2006/07: Master Seminar "Visualization"
Summer 2006: Bachelor Lecture "User Interfaces"
Winter 2005/06: Bachelor Lecture "Fundamentals of Computer Graphics", Master Seminar "Visualization"

Master Students (Co-)Supervision

Multiple Coordinated Views on Massive Geo Data
Robert Schäfer, Master's Thesis, 2017
A framework for thematic visualization in service-based virtual 3D city models
Roman Preuss, Master's Thesis, 2015
Interaktive Analyse und Visualisierung der Erreichbarkeit in Verkehrsnetzen
Henning Hollburg, Master's Thesis, 2013
Visualization of Building Information Models - Concept and Implementation of 3D Visualization Techniques.
Christoph J. Knop, Master Thesis, 2007/2008
Navigation and Object Interaction in Virtual 3D City Models based on Sketches and Gestures
André Calliess, Diploma Thesis, 2009
Acquisition, Processing, Provision, and Visualization of Indoor Tracking Data
Bastian Brehmer, Master's Thesis, 2009
Concepts and Techniques for Collaborative Virtual 3D City Models
Jan Klimke, Master Thesis, 2009
Design and Implementation of a Virtual 3D City Model of Historic Potsdam
Claudia Schenk, Master's Thesis, 2011

Master's Project (Co-)Supervision

Winter 2017/18: Processing Massive Data for Visual Analytics (G. Berezc)
Winter 2016/17: Echtzeitvisualisierung von Sensordatenströmen (J. Hartmann)
Summer 2016: Sensor Data Analysis & Visualization, (F. Moritz)

Bachelor's Project & Thesis (Co-)Supervision

2012/2013: Interaktive 3D-Modelle auf mobilen Geräten
2011/2012: Mobile 3D-Apps: Services und Clients zur interaktiven 3D-Visualisualisierung
2010/2011: 3D-Visualisierung für mobile Anwendungen auf SOA-Basis
2008/2009: Smartbard-basiertes User-Interface für 3D-Stadtmodelle

Dr. Benjamin Hagedorn

Contact

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Current Research Projects

Past Research Projects

Publications

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