OS MasterMap Topography Layer

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Dataset Description:

The OS MasterMap Topography Layer is the most detailed and accurate view of Great Britain’s landscape, defining physical features such as roads, buildings, fences and trees.  These features are described spatially as geometrical objects (vector polygons) in a seamless geodatabase, together with a rich attribute specification including a unique reference number (TOID) which can be used to link to external databases.


Dataset Thumbnail:


Dataset Specification:


Product Name

OS MasterMap Topography Layer

Data Provider

Ordnance Survey


1:1,250 to 1:10,000


Great Britain (complete)

Data Structure

Vector (points, polylines, polygons and text)


Esri Shapefile, Esri File GeoDatabase, MapInfo TAB, MID/MIF, Autodesk DWG, DXF, OGC KML, OGC GML, CSV (attribute data only)


Large scale, site-level applications


Academic Licence

Update Frequency

Every 6 weeks


Dataset Resources:

Product site
Support site
Release Schedule
Product Guide (pdf)
Technical Specification (pdf)
Cartographic Styling Guide (pdf)
Real World Object Catalogue (pdf)
Feature Catalogue (zip)