Product details

This page outlines the three OS Open Built Up Areas feature types, their attribution, standards and coordinate reference system.

Feature types

OS Open Built Up Areas is classified into three feature types: Built Up Areas, Built Up Extents, and

Built Up Areas

Built Up Areas is the aggregation of Built Up Extents and Non Built Up Extents.

This is a multipart area feature with a single Government Statistical Service (GSS) code and name or names.

Built Up Extents and Non Built Up Extents Feature Types and attribution.

Full attribution for this feature type is available on the Built Up Areas page of the technical specification.

Built Up Extents

Built Up Extents is the representation of built-up areas only within the extent of Built Up Areas. This is the area that remains after Non Built Up Extents have been removed from Built Up Areas.

This is a multipart area feature with the same GSS code as the related Built Up Areas with the same name or names.

Built Up Extents Feature Type.

Built Up Extents Feature Type and attribution.

Full attribution for this feature type is available on the Built Up Extents page of the technical specification.

Non Built Up Extents

Non Built Up Extents is the representation of non-built-up areas within the extent of Built Up Areas.

This is a multipart area feature with the same GSS code as the related Built Up Areas with the same name or names.

Non Built Up Extents Feature Type.

Full attribution for this feature type is available on the Non Built Up Extents page of the technical specification.

Standards

OS Open Built Up Areas is designed to conform to OGC standards.

Coordinate reference system

OS Open Built Up Areas uses the British National Grid (BNG) coordinate reference system. BNG uses the OSGB36 geodetic datum and a single Transverse Mercator projection for the whole of Great Britain.

Positions on this projection are described using easting and northing coordinates in units of metres. The BNG is a horizontal spatial reference system only; it does not include a vertical (height) reference system.