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Geographic Data Files or GDF is an interchange file format for geographic data. 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. Most recent extension expand applicability further towards Pedestrian Navigation, 3-D map rendering, and Advanced Driver Assistance Systems (ADAS). GDF is commonly used for data interchange in many industries such as Automotive navigation system, fleet management, dispatch management, road traffic analysis, , Automatic Vehicle Location. Originated as a flat plain-text 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, TomTom, Mapscape BV, GeoSmart, Automotive Navigation Data, AutoNavi and NavInfo. ==Standardisation== GDF is an international standard that is used to model, describe and transfer road networks 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 3: * ISO GDF 4.0, formally referred to ISO14825:2004, now replaced by * ISO 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 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Geographic Data Files」の詳細全文を読む スポンサード リンク
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