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OS MasterMap Topography Layer support

OS MasterMap Topography Layer is the most detailed, current and comprehensive map dataset of Great Britain. Support documents for Building Height Attribute and Sites Layer are also included here.

Getting started

OS MasterMap Topography Layer allows you to reference your data with it to any real-world feature, helping you to manage your organisation's assets.

Topography layer product guide (PDF)

Discover the range of features available with OS MasterMap Topography Layer.

Building Height Attribute getting started guide (PDF)

OS MasterMap Topography Layer – Building Height Attribute is an enhancement to, and forms part of, OS MasterMap Topography Layer.

Sites Layer user guide (PDF)

OS MasterMap Sites Layer provides a nationally maintained view of the detailed extents of important locations such as airports, schools, hospitals, utility and infrastructure sites and more.

Topography Layer FAQs

How to get this product

Technical information

All the technical specifications and user guides for OS MasterMap Topography Layer, Building Height Attribute and Sites Layer.

Topography Layer technical specification (PDF)

OS MasterMap Topography Layer provides the most detailed and accurate large scale representation of Great Britain available from Ordnance Survey.

Building Height Attribute technical specification (PDF)

OS MasterMap Topography Layer-Building Height Attribute (BHA) Beta release is a dataset containing absolute and relative height values for buildings contained within OS MasterMap Topography Layer.

Sites Layer technical specification (PDF)

Sites Layer is intended to enhance analytical use of the information contained in OS MasterMap Topography Layer.

Building Height Attribute product guide (PDF)

Building Height Attribute can also be integrated with other Ordnance Survey products such as OS Terrain® 5 and OS MasterMap Imagery Layer.


Key FeaturesWhat this product offers
Themes - OS MasterMap Topography Layer – buildings, heritage & antiquities. - OS MasterMap Sites Layer – education, medical care, rail transport, road transport, water transport, utility, and industrial.
Update frequency - OS MasterMap Topography Layer – every six weeks (view release schedule) thanks to continuous and cyclic revision. - OS MasterMap Sites Layer – every six months. - Building Height Attribute – this is an alpha release currently under development.
Coverage - OS MasterMap Topography Layer – Great Britain (define your own area of interest or take advantage of pre-defined areas of interest). - OS MasterMap Sites Layer – Great Britain (order 5km2 tiles to cover your Topography Layer area of interest). - Building Height Attribute – see our interactive coverage map.
Format - OS MasterMap Topography Layer – GML 2.1.2 - OS MasterMap Sites Layer – GML 3.2.1 - Building Height Attribute – CSV
Supply - OS MasterMap Topography Layer and Sites Layer – FTP (for orders under 2Gb) and DVD. - Building Height Attribute – Members of mapping agreements can download this from the members' area. Partners and direct customers should contact their account manager.
Data structureVector (points, lines, polygons and text)
Scale1:1250 to 1:10 000
OS Mastermap topography Tower of London

OS MasterMap Topography Layer

View product details