🆕OS BaseMap Pro FAQs

This page provides answers to the most frequently asked questions about using the OS BaseMap Pro product.

FAQs

Can I trace OS data or digitise my own data using this product?

Yes. OS BaseMap Pro is a vector product, and GIS software users will be able to snap to and trace along any feature, allowing them to capture data and digitise assets as they would in OS MasterMap Topography Layer today in line with OS terms and conditions.

Will OS BaseMap Pro carry a period of dual licensing?

Yes. We anticipate that existing customers of OS MasterMap Topography Layer will be able to benefit from dual licensing for the 3-year period between the launch of OS BaseMap Pro in 2027 and the End of Life (withdrawal) of OS MasterMap Topography Layer in 2030, allowing time to transition to the new schema, formats and refresh cycle.

Will OS BaseMap Pro contain identifiers?

Yes. OS BaseMap Pro will contain an identifier called the OSID (OS Identifier). OSIDs are used across the OS National Geographic Database (OS NGD) to uniquely identify records within a feature type and have a maintained lifecycle, enabling them to support change tracking and linkages across datasets. For more information, please visit the OS NGD Unique Identifiers page. OS BaseMap Pro will not contain Topographic Identifiers (TOIDs), which are the primary unique identifier in the legacy OS MasterMap Topography Layer product. To assist existing customers with their transition from OS MasterMap Topography Layer to OS BaseMap Pro, we will provide a maintained cross-reference table mapping OSIDs to TOIDs until the End of Life of OS MasterMap Topography Layer in 2030, when the table will cease to be maintained.

What formats will OS BaseMap Pro be available in?

In line with other OS National Geographic Database (OS NGD) offerings, when released as a full product, OS BaseMap Pro will be available to download in GeoPackage and CSV formats from the OS Data Hub.

What are the differences between OS MasterMap Topography Layer and OS BaseMap Pro?

An updated comparison between the two products at this stage will be available in the support documentation of Prototype 2 in April 2026.

If you would like to take part in the Prototype 2 feedback round, please register your interest by filling out this Microsoft Form sign-up sheet.