Product supply

Available formats

OS MasterMap Sites Layer is supplied in three different formats:

• Geography Markup Language (GML) 3.2.1

• GeoPackage

• Vector tiles (MBTiles)

Product supply mechanism

Coverage and file sizes

For GML, OS MasterMap Sites Layer is a national dataset and is maintained and supplied as 5km² tiles of data via Area of Interest (AOI) supply or as Great Britain (GB) supply. File size estimates can vary from about 2 KB compressed to about 162 KB (compressed) for tile supply. A full GB supply will be approximately 43 MB compressed. Compression rates vary and are dependent on the size and content of a tile.

For GeoPackage and vector tiles, the coverage will be GB supply only. The file size is approximately 90 MB zipped for GeoPackage, and 160 MB zipped for vector tiles.

Change-only updates

Change-only updates (COU) are not available for OS MasterMap Sites Layer.