April 2024

The April 2024 release note for the OS MasterMap Topography Layer – Building Height Attribute product

Building Height Attribute (BHA) is an enhancement to, and forms part of, OS MasterMap Topography Layer. It provides a set of height attributes with a buildings theme within OS MasterMap Topography Layer.

Building Height Attribute tiles

• Total tiles: 9 987

• New tiles: 2 (NH1010 and NN5080)

• Deleted tiles: 0

Extent

The April 2024 BHA release contains building heights for 47 350 827 buildings, tanks, chimneys, and glasshouses across the entirety of Great Britain.

Limitations

Some building TOIDs (Topographic Identifiers) in OS MasterMap Topography Layer will have no corresponding height values in the BHA data in areas of coverage. This can occur because of different update cycles or in instances when a building was constructed after the capture of the source BHA data. This is also the case when a building has failed quality validation checks and there is no existing data to replace it.

Building height values are generated from a fully automated process and, as such, the accuracy of the values is subject to tolerances governed by the process. Ordnance Survey specifically disclaims any warranty that OS MasterMap Topography Layer – BHA is of satisfactory quality or fitness for a particular purpose. We further disclaim any warranty that OS MasterMap Topography Layer – BHA is error free or accurate.

Next release

The next release of OS MasterMap Topography Layer – BHA is scheduled for October 2024.