Abstract
Abstract. The object-oriented database architecture DB4GeO was originally designed to support sub-surface applications in the geo-sciences. This is reflected in DB4GeO's geometric data model as well as in its import and export functions. Initially, these functions were designed for communication with 3D geological modeling and visualization tools such as GOCAD or MeshLab. However, it soon became clear that DB4GeO was suitable for a much wider range of applications. Therefore it is natural to move away from a standalone solution and to open the access to DB4GeO data by standardized OGC web-services. Though REST and OGC services seem incompatible at first sight, the implementation in DB4GeO shows that OGC-based implementation of web-services may use parts of the DB4GeO-REST implementation. Starting with initial solutions in the history of DB4GeO, this paper will introduce the design, adaptation (i.e. model transformation), and first steps in the implementation of OGC Web Feature (WFS) and Web Processing Services (WPS), as new interfaces to DB4GeO data and operations. Among its capabilities, DB4GeO can provide data in different data formats like GML, GOCAD, or DB3D XML through a WFS, as well as its ability to run operations like a 3D-to-2D service, or mesh-simplification (Progressive Meshes) through a WPS. We then demonstrate, an Android-based mobile 3D augmented reality viewer for DB4GeO that uses the Web Feature Service to visualize 3D geo-database query results. Finally, we explore future research work considering DB4GeO in the framework of the research group "Computer-Aided Collaborative Subway Track Planning in Multi-Scale 3D City and Building Models".
Highlights
For Geographical Information Systems predominantly processing geo-spatial data in two-dimensional space, the problem of standardizing data and operations was first addressed 20 years ago focusing on the interoperability aspect at the Open GeoSpatial Consortium (OGC 1994)
Standardized access to 3D geo-spatial databases is an important issue to be considered by the 3D GeoInfo Community
A 3D geomodelling client like GOCAD would prefer a geo-object resource to be represented as a GOCAD file in order to directly visualize the 3D model of the geo-object
Summary
For Geographical Information Systems predominantly processing geo-spatial data in two-dimensional space, the problem of standardizing data and operations was first addressed 20 years ago focusing on the interoperability aspect at the Open GeoSpatial Consortium (OGC 1994). Standardized access to 3D geo-spatial databases is an important issue to be considered by the 3D GeoInfo Community. Pouliot and her group (Pouliot et al 2007; 2010) worked on the problem by developing the concept of an open system architecture called Web Geological Feature Service (WGFS). The OGC compliant Web Feature Service and spatial schema are directly used in the architecture This approach simplifies the transfer from GOCAD data (Mallet, 1992; Mallet, 2002) into a geological database. The double-blind peer-review was conducted on the basis of the full paper. 87
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