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Imputation
Imputation is the process of estimating an unknown value. ONS Geography's postcode directories therefore contain imputed grid references for those postcodes that have not had a definitive grid reference supplied by Ordnance Survey.

Index of Place Names (IPN)
ONS Geography's Index of Place Names (IPN) relates nearly 70,000 named places in England and Wales to their respective local government areas and other geographies. Grid references are also provided and, for entries with legally defined boundaries, 1991 population counts.
Full product information; product available online.

Infrastructure for Spatial Information in Europe (INSPIRE)
INSPIRE is an initiative of the European Commission to develop the availability of spatial information for the formulation, implementation and evaluation of European Union policies. INSPIRE encompasses a wide range of subject matter including technical standards and protocols, organisational issues and data policy. It will coordinate the creation and maintenance of geographic information for a wide range of themes, of which environmental information will be the first.

Inner London
Inner London refers to the part of Greater London falling within the boundaries of the former London County, which existed from 1889 to 1965. The Inner London area includes the City of London and 13 of the London boroughs.
Map of Greater London showing the inner and outer London boroughs. (457Kb pdf).

Intermediate Geography
The intermediate geography is a new geography used for small area reporting in Scotland. Intermediate zones are built from clusters of data zones and fit within council area boundaries. Each intermediate zone contains at least 2500 residents. As with the Super Output Area (SOA) geographies in the rest of the UK, the intermediate geography is intended to be stable.
Further information on the intermediate geography.

Intermediate Zones
See Intermediate Geography

Intra-governmental Group on Geographic Information (IGGI)
The Intra-governmental Group on Geographic Information (IGGI) is a body of representatives from around 80 different government bodies with an interest in Geographic Information (GI). IGGI's aim is 'to promote the effective use of government geographic information', benefitting member organisations by enabling them to operate more efficiently and better fulfil their duties as GI providers.
IGGI website: Further information on IGGI.

Irish National Grid
The Irish National Grid is a common referencing format for geographic data in Ireland, and covers both Northern Ireland and Eire (the Irish Republic). The result is that any location in Ireland can be described in terms of its distance from the origin (0,0), which lies off the southwest coast.

IT Cluster
IT clusters occur in the National Health Service (NHS). They consist of groups of between five and seven Strategic Health Authorities (SHAs) working together to implement the NHS's new technology and information systems.

This page last revised: Thursday, 21 April 2005