Published on 1 February 2016.

Public Task Dataset	Brief description of Dataset	Products currently produced from the Dataset which are within the Public Task
NATIONAL GEOGRAPHIC DATABASE (NGD) DATASETS:
Precise Positioning Data	A dataset of real time readings taken from a network of permanent GNSS receivers across Great Britain. The combined data is used to generate corrections that enable precise positions to be defined by a GNSS roving receiver.	OS Net services
Topography	Content and unique identifiers regarding the topography of Great Britain, ‘topography’ meaning the surface, shape and composition of the landscape, comprising both natural and artificial features. Constitutes the only nationally topologically consistent, fully maintained and authoritative large scale topographic data available for the whole of Great Britain. Populated directly from surveys collected at precisions and root mean square error accuracy (RMSE) of: - Urban areas 0.4m - Rural areas 1.1m - Mountain and moorland 4.2m	OS MasterMap® Topography Layer
Communications networks	Authoritative, geometrically precise and nationally consistent large scale communications (road, track and path) network data together with traffic flow, height and weight restriction attributes for all of Great Britain. The dataset comprises: - Roads network data - Urban Path network data	OS MasterMap® Integrated Transport Network layer OS MasterMap® Networks – Water Layer OS Open Rivers OS Open Roads
Addressing	Authoritative and fully maintained database of precisely grid referenced addresses providing consistently attributed detailed data for the whole of Great Britain, and forming the core addressing content of NGD, and containing Land and Property Address Data.	AddressBase™ AddressBase™ Plus AddressBase™ Premium ADDRESS-POINT OS MasterMap Address Layer OS MasterMap Address Layer 2 Code-Point Code-Point with Polygons Code-Point Open OS Locator 1:50 000 Scale Gazetteer OS Open Names
National Height data	The Integrated Digital Terrain Model (iDTM) contains information about the terrain and features of Great Britain. It is an authoritative and nationally consistent dataset stored and maintained in three dimensions as a Triangulated Irregular Network (TIN). The model is accurate to RMSE of 1.5m in urban areas, and 2.5m in rural areas and mountainous and moorland regions. The height model has been interrogated to output digital terrain models (bare earth) at two resolutions with horizontal resolutions of 5 metres and 50 metres respectively.	OS Terrain 5 OS Terrain 50
Administrative Boundaries	The authoritative reference dataset of administrative area polygons complementing other formal management (e.g. health service; utility services) and statistical analysis areas. The data is derived from the surveyed alignments and Boundary Order attribution contained within the NGD Topography, and presented at a resolution commensurate with a nominal scale of 1:10 000, comprising: European and UK Parliamentary Constituency Boundaries within Great Britain; National Boundaries within Great Britain; and Local Authority administration boundaries.	Boundary-Line™
Mid-Scales Databases	Datasets derived from the large scale topographic database using nationally consistent generalisation rules.	OS VectorMap Local Vector OS VectorMap Local Raster OS StreetView OS VectorMap District Vector OS VectorMap District Raster 1:25,000 Scale Colour Raster OS Open Map Local OS Explorer Map series
1:50,000 Scale Height data	A database of contours created from height elements depicted in the OS Landranger 1:50 000 scale map series. These were originally generated from stereo aerial photography flown during the 1970s. Contours: 10m vertical interval – national cover with an accuracy of 3.0m RMSE; and Digital Terrain Model with a 50m horizontal rectangular grid.	Land-Form PANORAMA® Contours Land-Form PANORAMA® DTM
Small-Scales Vector database	A multi-sourced geographical reference dataset at a nominal scale of circa 1:50 000.	Meridian2
1:250 000 Scale Database	Consistent national small scales database of communications, settlements, major hydrology and significant vegetation providing selected topographic information at the regional level.	Strategi® 1:250,000 Scale Colour Raster Administrative Boundary Maps
1:1 000 000 dataset	A simple graphical dataset of Great Britain with geographical and topographical content appropriate to a small scales national geographical overview map.	MiniScale

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