OS MasterMap (premium)

OS MasterMap (premium) (Ordnance Survey). Access: licensed download / API. Formats: GML, GPKG. Resolution: vector 1:1250. Coverage: GB. Pricing/licence: paid / PSGA.

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What's in it

Data offered docs-verified: buildings · roads · rivers · land use · natural features
Coverage docs-verified: Great Britain
Resolution docs-verified: Vector, scale 1:1 250 to 1:10 000
Update frequency docs-verified: Every six weeks
Formats docs-verified: GeoPackage · GML · Vector Tiles
Access llm-inferred: Paid, licensed download and API (licence PSGA, per entry metadata); free sample data available

Useful for

Use cases llm-inferred: Site constraint and context mapping for planning applications and development impact assessment · Land use and habitat baseline inputs for ecological surveys · Geo-referencing of pipelines, bridges and other assets using TOID identifiers · Building and terrain context for drainage or flood risk assessments
Audience llm-inferred: GIS analysts · planners · ecologists · drainage engineers · civils engineers

Limitations

Constraints llm-inferred: Paid licence (PSGA), so not freely redistributable · Updated every six weeks, so not real-time · Detail is limited to scales between 1:1 250 and 1:10 000 · No MCP tools; the entry is a dataset only

Licence: paid / PSGA
Authentication: Unknown — review source docs
GitHub stars: Unknown
Last commit: Unknown
Last successful page check: 16/10/2026
Page health: healthy
Package: Not recorded
Verification: Not independently verified

Provenance & evidence

Verified 2026-10-16 (curl HTTP 200).

Metadata observed 14/10/2026 · research sweep: sweep-2026-10-16 (named: UK)

https://www.ordnancesurvey.co.uk/products/os-mastermap-topography-layer