ABSTRACT:Nowadays, rapid technological development into acquiring geo-spatial information; joined to the capabilities to process these data in a relative short period of time, allows the generation of detailed 3D textured city models that will become an essential part of the modern city information infrastructure (Spatial Data Infrastructure) and, can be used to integrate various data from different sources for public accessible visualisation and many other applications. One of the main bottlenecks, which at the moment limit the use of these datasets to few experts, is a lack on efficient visualization systems through the web and interoperable frameworks that allow standardising the access to the city models. The work presented in this paper tries to satisfy these two requirements developing a 3D web-based visualization system based on OGC standards and effective visualization concepts. The architectural framework, based on Services Oriented Architecture (SOA) concepts, provides the 3D city data to a web client designed to support the view process in a very effective way. The first part of the work is to design a framework compliant to the 3D Portrayal Service drafted by the of the Open Geospatial Consortium (OGC) 3D standardization working group. The latter is related to the development of an effective web client able to render in an efficient way the 3D city models.

This paper illustrates the preliminary results of a research project focused on the development of a Web 2.0 system designed to compute and visualize large-scale building energy performance maps, so called "ecomaps", using: emerging platform-independent technologies such as WebGL for data presentation, an extended version of the EU-Founded project TABULA/EPISCOPE for automatic calculation of building energy parameters and CityGML OGC standard as data container. The proposed architecture will allow citizens, public administrations and government agencies to perform city-wide analyses on the energy performance of building stocks.

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In recent years, several mobile devices with excellent performances have become accessible to people at affordable prices. The availability of this equipment, especially in the mobile sector, has encouraged research and development of increasingly complex applications ("Apps") for the visualization of large-scale scenes. However, 3D maps typically available through mobile version of so-called "spinning globes" do not allow the use of high definition data, due to their hardware limitations compared to desktop devices. As a result it often happens that a final user is navigating a real life familiar area, without being able to recognize its orography or specific features that are typical of the real world due to the poor resolution of the underlying 3D geometry. This is particularly amplified within mountain areas where crests, ridges and valleys are not adequately represented, due to the low resolution of the underlying digital terrain model, severely limiting the user's experience.The main contribution of the work presented by this paper is the enhanced user experience through high fidelity terrain representation, which is provided by an App that addresses the two aforementioned items.