OS NGD Buildings

Introduction to the theme

The OS NGD Buildings Theme contains building features which meet the definition of a permanent roofed construction, usually with walls. Embedded height attribution is available for building parts, enabling users to create simple height models.

In comparison to existing OS data, the OS NGD buildings data has been enriched with additional attribution, including the following:

• Geometry change metadata

• A Description attribute to provide a one-word or simple phrase description of a feature

• Detailed land use classification

• Detailed land cover classification

• Capture specification to give details about the geography of the area a feature resides in (that is, urban, rural, or moorland)

Data structure

The OS NGD Buildings Theme is made up of the OS NGD Building Features Collection, which in turn is comprised of Building Line, Building Part, and Building Feature Types.

OS NGD Buildings Theme data structure diagram showing the theme name, collection name and feature type names.

Unique identifiers

Two unique identifiers are provided with each feature within the OS NGD Buildings Theme:

• OSID (Ordnance Survey Identifier): The primary identifier and unique key for this theme.

• TOID (Topographic Identifier): An additional secondary identifier which can aid further data linking. TOIDs are an optional attribute and therefore will not always be provided with every feature.