OS MasterMap^® technical information

User guides, implementation sheets and style guides  - OS MasterMap general two-part user guide and layer specific user guides and technical specifications. 

New Revision Programme for OS MasterMap -  Ordnance Survey is implementing a new approach to the way in which it revises its large-scale topographic data products.  The changes relate to the programme that will be implemented for revision of rural and moorland geography via cyclic revision (which is collected via aerial photography).

Systems and software  - Information on system requirements and Ordnance Survey's partners who are playing a major role in enabling the early adoption of OS MasterMap. 
Recommended system requirements for OS MasterMap data and online service More >>>

Change-only update  - Change-only update is available on period licence contracts.   

Integrated Transport NetworkTM (ITN) GML definition   - This document provides examples in GML format of the features found within the ITN layer. 

Creating a level 3 Local Street Gazetteer  - To help you with this we have written a paper that details how this can be achieved very quickly and easily using the OS MasterMap® Integrated Transport Network™ Layer.

Linking NSG data to the Integrated Transport Network Layer

XML schema repository  - A machine-readable specification of the structure and contents of the GML encoded information. 

Managed GB set - A service for customers with full GB coverage contracts of OS MasterMap (excluding Imagery Layer).   

Service and GML schema version  - The history of the OS MasterMap service and associated GML schema changes.  

Real-world object catalogue  - Detailed information about the real-world objects that are captured as part of the specification, and how they are classified in OS MasterMap.
Note capture policy and specification changes over time mean that not all occurrences of every feature within the catalogue will be present in the data at any one time. 

Data measures - Generic definitions of the ways in which Ordnance Survey measures the data in its products. 

GML 2.1.2 - OS MasterMap is supplied in GML 2.1.2.