Orthophotography (ortho) is high quality georeferenced digital 3 Band aerial photography.

Orthophotographs are scale-accurate raster images that offer a detailed bird’s-eye view of the landscape.

Any distortions caused by the earth’s surface or aircraft movement have been removed by a process of ortho-rectification to ensure the images are accurate.

Photographs are captured in optimal weather conditions to provide the best possible images.

OSNI 4 Band orthophotograpy is produced through the same process as the 3 Band product and both are updated in conjunction with each other on the same cycle.

This 4 Band raster data can be used in a wide variety of applications such as vegetation classification, measuring vegetation health and feature change detection.

A Digital Terrain Model (DTM) is a digital file providing a highly detailed representation of the topographical (i.e. relief) variations in the Earth’s surface.

Combined with other digital data, such as maps or orthophotographs, it can provide a 3D image of the land surface.

The OSNI Enhanced DTM includes breaklines at major changes of slope and terrain elevations for ground positions at 60m spaced horizontal intervals. It is updated in line with the orthophotography.

The added dimension and visualisation offered by a DTM can help in many decision-making processes.

The OSNI Digital Surface Model is produced from aerial imagery using a photogrammetric process and is updated in line with the orthophotography and DTM products.

This high quality data is available as raster and point cloud, both at 40cm spatial resolution. It can be used for a wide variety of applications: line of sight, planning, aspect modelling (e.g. solar panels) and remote sensing applications such as change detection.

The 1:10,000 scale raster mapping is derived directly from the OSNI large-scale database.

This dataset provides clear, detailed information on features such as roads, fields, water and settlements, overlaid by contours at 10m intervals.

The map styling has been completely revised to produce clear mapping suitable for use in Geographic Information applications.

An award winning series of six 1:25,000 scale raster maps tailored to outdoor leisure activities that are also available as a paper product.

The series consists of the Mournes, Sperrins, Lough Erne, Strangford Lough, Glens of Antrim and Causeway Coast and Rathlin Island.

They are individually designed for each specific area and show details of features such as tracks, walks, and cliffs; the Lough Erne map concentrates on water activities, showing navigation guides and hydrographic information.

The 1:50,000 scale raster mapping provides a digital equivalent to the popular paper Discoverer Series with each of the 54 raster tiles covering 20x20km.

Each tile is provided with a full colour version with grid, a low colour version and a townlands map. Relief shading has been reduced on the low colour raster to make it more suitable for GI use.

The 1:250,000 scale raster provides a clear map covering the whole of Northern Ireland and highlighting features such as roads, golf courses, settlements and sites of interest.

A black and white outline version is provided along with a full colour image. The mapping is also available as the ‘Ireland North’ paper map which is part of the ‘Holiday Ireland’ series.

The OSNI Belfast Street Map is a high resolution raster map at 1:12,000 scale showing clear street level detail for use in any geographic information software.

It covers the entire Greater Belfast area and is also available as a paper map. A street gazetteer is provided with both the digital and paper versions.

The OSNI Historical Archive provides over 20,000 scanned versions of historical mapping products dating from 1835 to the late 1950’s.

The archive is a unique educational resource which gives you digital access to maps of significant cultural and social value.

OSNI Fusion is the most recent largescale vector product and replaces OSNI Largescale.

It consists of a more intuitive structure and contains 11 main themes, with the existing largescale feature types being held as attributes.

Each feature will have a unique identifier and life cycle information. The full polygonisation of OSNI Fusion will facilitate the linkage of other products via unique identifiers.

Consequently, a range of Fusion products will be developed through the amalgamation of Fusion layers with other key OSNI Products, such as Pointer and the Transport Network.

OSNI Fusion Transport Network is an enhanced road network vector product currently being developed to replace OSNI Road Centreline.

It consists of lines, points and attributes, such as road name, number, classification, form of way, directionality and unique street reference number, which will provide a direct link to addresses in Pointer.

Drive restriction data will be added to include restrictions on height, weight, use etc. Features, such as bridges, traffic calming and level crossings will also be included in the dataset.

It will be fully integrated and updated in line with OSNI Fusion and will form part of the Fusion suite of products.

The OSNI Road Centreline is a vector dataset, created at 1:1,250 and 1:2,500 scale, comprising of line geometry for classified roads in Northern Ireland.

The geometry is attributed with road name, classification and unique street reference number, which can be used as a direct link to addresses in Pointer.

This product will be replaced by the OSNI Fusion Transport Network and withdrawn from supply.

The 1:50,000 scale vector data is made up of a number of distinct datasets including vegetation, relief and drainage as well as settlement outlines.

The administrative boundary and road layers are now available under Open Government Licence. The datasets are available as full coverage of Northern Ireland.

Please find below our Full Spatial NI Service Lists of datasets available to OSNI NIMA customers through Spatial NI Portal, AGOL and OGC