Abstract. The PROBADO project is a research effort to develop Digital Library support for non-textual documents. The main goal is to contribute to all parts of the Digital Library workflow from content acquisition over semi-automatic indexing to search and presentation. PROBADO3D is a part of the PROBADO framework designed to support 3D documents, with a focus on the Architectural domain. This demonstration will present a set of specialized user interfaces that were developed for content-based querying in this document domain. Interfaces for Querying in 3D Architectural DataPROBADO3D supports search in metadata space, as well as in content-based space in 3D architectural data comprising models of buildings, and interior and exterior elements. Content-based search relies on domain specific indexing services generating descriptors of the building models during an offline indexing stage. The descriptors include global shape properties as well as connectivity information which describes the layout of rooms within the buildings [1] (cf. Figure 1(a) for an example). For querying in these indexes, specific interfaces have been developed to graphically specify queries for similar content. The following interfaces are currently considered.Querying for Similar Global Shape. Queries for the overall shape of building models are supported by sketching of 3D volumes, or by 2D floor plans. Two editors allow specification of volumes or floor plans. One interface provides a 2D/3D editor based on the Generative Modeling Language (GML [2]) (cf. Figure 1(b)). The other uses the modeling capabilities of Google Sketchup [3] (cf. Figure 1(c)).Querying for Room Configurations. The configuration of rooms inside a building is also an important property which architects like to search for (cf. Figure 1(d)). A graph editor interface allows to input an abstract specification of room connectivity structure (cf. Figure 1(e)). A plan-based interface allows to edit a room sketch (cf. Figure 1(f)).

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