A TOID (Topographic Identifier) is a unique and persistent identifier for each and every feature found in OS MasterMap products. This dataset shows unique identifiers for a wide range of landscape and built environment features, with a generalised location, extracted from OS MasterMap products.
This product is updated every six weeks
TOIDs are the authoritative identifier assigned to and uniquely identifying real world objects, being essential for customers to link their own data to and track change over time.
OS Open TOID will enable data to be shared for a wide range of landscape and built environment features by providing them with a unique identity and generalised location that can be used by everyone. Watch our OS Open TOID introduction video.
All Topographic points, lines and polygons present in OS MasterMap Topography Layer and junctions, roads and path present in OS MasterMap Highways Networks are also part of this product – so you can be sure you’re not missing out.
The TOIDs in OS Open TOID are allocated by Ordnance Survey. This means you can have confidence you’re accessing an authoritative source of these identifiers.
The TOID is never re-used, once its allocated to a feature, that’s it, it will never change or be reused.
Technical information
The register for TOIDs is not exhaustive. Not all TOID features are included as some feature types are not useful for third party data references, however all TOIDs are provided for each feature type we have included.
TOID geometry always lies within the polygon. We are using a pole of inaccessibility algorithm to selection a generalised point location for polygon which can be used to position a label for that feature. The aim is to provide a point which is most suitable for labelling the polygon. In the situation where we have a multi-polygon feature (only found in our Sites Layer), the point is placed in the largest polygon.
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