ISO 14825:2011 Intelligent transport systems - Geographic Data Files (GDF) - GDF5.0
ISO 14825:2011 specifies the conceptual and logical data model and physical encoding formats for geographic databases for Intelligent Transport Systems (ITS) applications and services. It includes a specification of potential contents of such databases (data dictionaries for Features, Attributes and Relationships), a specification of how these contents shall be represented, and of how relevant information about the database itself can be specified (metadata).
The focus of ISO 14825:2011 is on ITS applications and services and it emphasises road and road related information. ITS applications and services, however, also require information in addition to road and road related information.
EXAMPLE 1 ITS applications and services need information about addressing systems in order to specify locations and/or destinations. Consequently, information about the administrative and postal subdivisions of an area is essential.
EXAMPLE 2 Map display is an important component of ITS applications and services. For proper map display, the inclusion of contextual information such as land and water cover is essential.
EXAMPLE 3 Point-of-Interest (POI) or service information is a key feature of traveller information. It adds value to end-user ITS applications and services.
The Conceptual Data Model has a broader focus than ITS applications and services. It is application independent, with observance for harmonization of this International Standard with other geographic database standards.
ISO 14825:2011 is widely used for intelligent transport systems (ITS) and related applications, and services, by vehicle manufacturers, electronic components manufacturers, manufacturers of global positioning system receivers, and geospatial data vendors. Note that while the geospatial data might be distributed using GDF, it is typically encoded into proprietary formats for more efficient processing within navigation systems and other components.
ISO 14825:2011 has been harmonised with the relevant ISO/TC 211 standards and includes all the core metadata defined in ISO 19115:2003.
However, it does not appear that GDF is used much for other types of applications.
ISO 14825:2011 is a very large document (over 1200 pages), as in addition to the data format (physical encoding), it includes the conceptual and logical data models, media record specifications, XML schema specifications, SQL encoding specifications, rules for data capture and portrayal, metadata and a comprehensive feature catalogue (classification system) with attributes, relationships and extensive code lists. The standard also includes annexes with extensive examples of how to use GDF, such as for complex time domains and generalizing networks. However, it is not clear why the standard has an annex duplicating ISO 639-2, Codes for the Representation of Names of Languages Part 2: Alpha-3 Code (as it was on 3 March 2009), and ISO 3166-1, Codes for the representation of names of countries and their subdivisions — Part 1: Country codes (as it was on 17 October 2008). Both ISO 639-2 and ISO 3166-1 are updated from time to time and freely available on the ISO website.
While very large, ISO 14825:2011 is probably relatively easy (though rather tedious) to implement, as it has extensive definitions, descriptions and illustrations, and snippets of pseudo-code and XML. However, it is probably only of interest to those implementing intelligent transport systems (ITS) and related transport applications.