OSNI® Fusion is the new largescale vector product which replaces OSNI Largescale.  It describes the form and location of features in Northern Ireland and adds additional information that describes how these are organised and relate to one another at 1:1250 - 1:2500 scale.

OSNI® Fusion contains  OSNI® Largescale data migrated into a new structure categorised by 13 themes, layered by geometry type and enhanced with additional attribution, such as full feature lifecycle information and Unique IDs.  The existing largescale feature types are held as attributes, making the data more user-friendly, linkable and easier to query.

The ground surface of Northern Ireland is described in three themes (Land, Transport and Water) overlaid with real-world features (Buildings, Ground Cover, Grid Extent, Land Intertidal Sea Theme, Perimeter and Structures).  Additional descriptive features are provided for Sites and Text plus a temporary 'Legacy' theme (which will be retired in due course).  

All features in OSNI® Fusion have life cycle information and unique identifiers including a 'Fusion-ID' for data linking with other datasets (e.g. OSNI® Pointer®).  OSNI® Fusion is aligned to EPSG: 29902 (TM65 Irish National Grid) and is supplied for user-defined areas, tiles (urban:  0.4km x 0.6km and rural: 0.8km x 1.2km) and Full-NI coverage.

Ordnance Survey of Northern Ireland (OSNI®) is the official producer of geographic mapping for Northern Ireland. OSNI® is part of Land & Property Services (LPS) within the Department of Finance and collects, processes and manages land and property information in support of economic and social development in Northern Ireland.