Geographic Data Files (GDF) is an

interchange Interchange may refer to: Transport * Interchange (road), a collection of ramps, exits, and entrances between two or more highways * Interchange (freight rail), the transfer of freight cars between railroad companies * Interchange station, a rai ...

file format A file format is a Computer standard, standard way that information is encoded for storage in a computer file. It specifies how bits are used to encode information in a digital storage medium. File formats may be either proprietary format, pr ...

for

geographic data Geographic data and information is defined in the ISO/TC 211 series of standards as data and information having an implicit or explicit association with a location relative to Earth (a geographic location or geographic position). It is also ca ...

. In contrast with generic GIS formats, GDF provides detailed rules for data capture and representation, and an extensive catalog of standard features, attributes and relationships. The most recent extension expanded applicability further towards pedestrian

navigation Navigation is a field of study that focuses on the process of monitoring and controlling the motion, movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navig ...

, 3-D map rendering, and

advanced driver-assistance systems Advanced driver-assistance systems (ADAS) are technologies that assist drivers with the safe operation of a vehicle. Through a human-machine interface, ADAS increases car and road safety. ADAS uses automated technology, such as sensors and camer ...

(ADAS). GDF is commonly used for data interchange in many industries such as

automotive navigation system An automotive navigation system is part of the automobile controls or a third party add-on used to find direction in an automobile. It typically uses a satellite navigation device to get its position data which is then correlated to a position on ...

s, fleet management, dispatch management, road traffic analysis,

traffic management Traffic management is a key branch within logistics. It concerns the planning, control and purchasing of transport services needed to physically move vehicles (for example aircraft, road vehicles, rolling stock and watercraft) and freight. Tr ...

, and

automatic vehicle location Automatic vehicle location (AVL or ~locating; telelocating in EU) is a means for automatically determining and transmitting the geographic location of a vehicle. This vehicle location data, from one or more vehicles, may then be collected by a ...

. Originated as a flat

plain-text In computing, plain text is a loose term for data (e.g. file contents) that represent only characters of readable material but not its graphical representation nor other objects (floating-point numbers, images, etc.). It may also include a limi ...

file, GDF is not intended to be used directly for any large scale geographic application and normally requires conversion into a more efficient format. Consumability has been increased with most-recent developments for XML and SQL renditions. The maps in GDF format are provided by many map vendors such as

HERE Here may refer to: Music * ''Here'' (Adrian Belew album), 1994 * ''Here'' (Alicia Keys album), 2016 * ''Here'' (Cal Tjader album), 1979 * ''Here'' (Edward Sharpe album), 2012 * ''Here'' (Idina Menzel album), 2004 * ''Here'' (Merzbow album), ...

, TomTom,

Mapscape BV Mapscape BV is a Netherlands-based independent business-to-business digital maps service provider. The company was founded in 2007 by Henk Eemers and Ralf Stollenwerk. It is active in the navigation and automotive industry. Mapscape is involved in c ...

, GeoSmart,

Automotive Navigation Data GeoJunxion, formerly AND International Publishers NV (AND), supplies digital map data, specific data layers such Low Emission Zones and services around map making. The products and services are used for GPS-based applications, logistic solution ...

AutoNavi AutoNavi Software Co., Ltd. () is a Chinese web mapping, navigation and location-based services provider, founded in 2001. One of its subsidiary companies, Beijing Mapabc Co. Ltd. (www.mapabc.com), is a map website in China. AutoNavi was acquir ...

and NavInfo.

Standardisation

GDF is an international standard that is used to model, describe and transfer

road network A street network is a system of interconnecting lines and points (called ''edges'' and ''nodes'' in network science) that represent a system of streets or roads for a given area. A street network provides the foundation for network analysis; for e ...

s and other geographic data. The standard was initially drawn up by CEN in co-operation with digital map providers, automotive and electronic equipment manufacturers. The outcome of these standardisation efforts (CEN GDF 3.0, or ENV14825:1996) has formed the major input to a global standard created by ISO/TC204 Sub

Working group A working group is a group of experts working together to achieve specified goals. Such groups are domain-specific and focus on discussion or activity around a specific subject area. The term can sometimes refer to an interdisciplinary collab ...

3: *

ISO The International Organization for Standardization (ISO ; ; ) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries. Me ...

GDF 4.0, formally referred to ISO14825:2004, now replaced by *

GDF 5.0, formally referred to ISO14825:2011. However, despite the existence of an ISO GDF standard, the nature of model abstractions as well as semantic interpretations and proprietary content extensions lead to

interoperability Interoperability is a characteristic of a product or system to work with other products or systems. While the term was initially defined for information technology or systems engineering services to allow for information exchange, a broader de ...

issues between flavors of GDF map products from different vendors. In practice the GDF files are not fully interchangeable due to vendor specific extensions. To this end, GDF5.0 provides major improvements in terms of extended meta data and flags for signalling implementation choices.

The new GDF5.0

The specifications of GDF5.0 were developed and compiled between 2001 and 2008, involving experts from Australia, Canada, Czech Republic, France, Germany, Japan, Republic of Korea, the Netherlands, and the United States of America. Extensive activities towards harmonization with ISO/TC211 standards were undertaken. GDF 5.0 was published in July 2011. Major GDF5.0 enhancements include UML model migration & refinements; harmonization with

linear referencing Linear referencing, also called linear reference system or linear referencing system (LRS), is a method of spatial referencing over linear or curvilinear elements, such as roads or rivers. In LRS, the locations of physical features are described ...

and geo-spatial web standards; support for 3-D content and time coordinates; comprehensive character set and

phonetic representation Phonetic transcription (also known as Phonetic script or Phonetic notation) is the visual representation of speech sounds (or ''phonetics'') by means of symbols. The most common type of phonetic transcription uses a phonetic alphabet, such as the ...

s; and new XML and SQL based delivery formats.

Background and rationale of GDF standardization

By the late 1980s, producers and users of digital road map data became increasingly aware of the need for a common data interchange standard. Lack of such a standard was seen as an impediment to the commercial growth and success of industries using such data. Before the advent of the Intelligent Transport Systems (ITS) industry, development of spatial data interchange standards was done mostly on a regional basis and not designed for the specialised requirements of road transport-related applications. In the 1990s, the GDF standard was instrumental in enabling the European

business-to-business Business-to-business (B2B or, in some countries, BtoB) refers to trade and commercial activity where a business sees other businesses as its customer base. This typically occurs when: * A business sources materials for its production process for ...

(B2B) market for in-vehicle navigation in that it provided interoperability for exchanging digital map data between map manufacturers and navigation system integrators. The GDF specifications provided a base for both the capturing of geographic content and the exchanging of it. Its original design foresaw a powerful, application-independent model, while its initial rendition as a standard specifically addressed the requirements for the richness of navigable map databases. Since then, GDF has evolved in terms of data modelling capabilities, broadened international applicability, expanded geographic domains, and diversified exchange formats. As a result, GDF covers a wide range of application domains and has been adapted to many geo-spatial technologies.

External links

Link to GDF5.0 standard on ISO website
GIS file formats Navigation Satellite navigation

Standardisation

The new GDF5.0

Background and rationale of GDF standardization

See also

External links