Defence Geospatial Information Working Group

DGIWG Feature and Attribute Data Registry

The Defence Geospatial Information Working Group (DGIWG) Feature and Attribute Data (FAD) Registry contains registers of geographic information concepts used to characterize aspects of real world phenomena for different information communities. In particular, geographic features are real world phenomena associated with a location relative to the surface of the earth, about which data are collected, maintained, and disseminated.

Each register establishes a Feature Data Dictionary (FDD) specifying independent sets of features and attributes that may be used to describe geographic information - establishing the universe of all feature concepts and attribute concepts (including datatype listed value concepts) that may be used in a particular context.

The DGIWG Feature and Attribute Data Registry makes use of a common structure and coding scheme across its component registers that conforms to ISO 19135, ISO 19126, and aspects of ISO 19110. This provides for flexible management of feature concept collections and is used as a basis for harmonization and the establishment of interoperability between different geographic information communities.

The DGIWG controls and maintains multiple component Feature Data Dictionary registers: the DGIWG FDD and a set of National Extension FDDs. The FAD Registry includes additional registers containing content drawn from specifications controlled and maintained by other organizations.

The DGIWG FDD incorporates many geographic information concepts from its predecessor, the DIGEST Feature and Attribute Coding Catalogue (FACC). Although DIGEST remains a valid standard, part 4 (FACC) has been sunsetted by DGIWG. Sunset standards are those that have been identified and approved for retirement. Usually a pre-defined event and date are associated with the eventual retirement of the standard. In addition, a replacement standard is frequently identified. For FACC the DFDD is the replacement standard.

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