This part specifies the conceptual and logical data model in addition to the physical encoding formats for geographic databases for ITS applications and services. This document includes a specification of potential contents of such databases (data dictionaries for Features, Attributes and Relationships), a specification of how these contents are to be represented, and how relevant information about the database itself can be specified (metadata). This part further defines map data used in automated driving systems, Cooperative-ITS, and Multi-modal transport.

The focus of this document is firstly on emerging ITS applications and services, such as CooperativeITS and automated driving systems, and it emphasizes road, lane and relevant information on road and lane. However, ITS applications and services also require other information in addition to road and road-related information, which are provided as external databases to connect with GDF and to complement each other. Highly defined public transport databases, for instance, are indispensable in multi-modal transport applications and services in particular. Thus, this document focuses secondly on an expansion of the specification to connect with externally existing databases. It is particularly designed to connect a Transmodel (EN 12896-1 and EN 12896-2) conformant public transport database.

Typical ITS applications and services targeted by this document are in-vehicle or portable navigation systems, traffic management centres, or services linked with road management systems, including public transport systems.

The conceptual data model specified here has a broader focus than ITS applications and services. It is application independent, allowing for future harmonization of this model with other geographic database standards.

It is expected that the process of revision of GDF will require some adjustment to the scope statements. Assuming that the Standard is modularized, each Part (module) will require a distinct scope statement. The future Parts addressed physical encoding, in general, may be expected to support a more optional nature, with alternative approaches conforming to the revised GDF conceptual and logical model and catalogues being supported by alternative industry-specified physical encoding approaches.

Further detailed guidance on the basis of modelling road networks from real-world road constructs may be added. Extension of concepts to support modelling of non-road surface transport networks and interconnection with network models for other modes of transport may also be included.

OGC publishes Standards that describe road and transportation networks, including the following:

Each of these Standards address road data for different or partially overlapping purposes. GDF offers an opportunity to bridge some common elements amongst these Standards and perhaps to provide additional model components to extend road data encoded in other OGC Standards.

As the GDF Standard will include an encoding Part, OGC work in both XML (Geography Markup Language) and JSON (the emerging Features and Geometries JSON Standard) are suitable for consideration for the encoding format.

The SWG will limit the scope of the initial deliverables to the general model expressed in previous versions of the GDF Standard.

The primary source for the GDF work is the existing GDF ISO Standard, identified above. Also ISO TR 19169.

[x] YES

[ ] NO

The SWG can be inactivated once a new revision of GDF is published and no requirements are identified for further update.

The initial deliverables from the SWG will be a conceptual model (and logical model) Standard part. The SWG will then publish one or more encoding parts for the conceptual/logical model.

The SWG anticipates completing a draft of Part 1 suitable for public comment in the first year of operation.

Not applicable at the time of initial chartering.

The GDF SWG will collaborate using a public GitHub repository to ensure maximum access to non-OGC Member stakeholders who can make valuable contributions to the requirements gathering for this Standard.

GDF originated in ISO/TC 204 and thus the expertise from that work is resident in ISO. Collaboration with Working Group 3 of ISO Technical Committee 204 (Intelligent transport systems) and the Joint Working Group between TC 204 and TC 211 (Geographic Information and Geomatics), identified as ISO TC 211 Joint Working Group 11, is foreseen.

Other relevant Standards or specification efforts include the following.

The first meeting of the SWG will occur via a web meeting platform within two weeks of approval of this charter.

The work of the SWG will be carried out primarily by email and web meetings, planned for every two weeks, with face-to-face meetings at each of the OGC Member Meetings.

The following people support this proposal and are committed to the Charter and projected meeting schedule. These members are known as SWG Founding or Charter members. The charter members agree to the SoW and IPR terms as defined in this charter. The charter members have voting rights beginning the day the SWG is officially formed. Charter Members are shown on the public SWG page. Extend the table as necessary.

Jon Harrod Booth, representing ISO/TC 204 Trond Hovland, representing ISO/TC 211