OSNI Open Data: 10-Meter Digital Terrain Model for Northern Ireland Sheets 251-293

Northern Ireland's land surface elevation data provided as a Digital Terrain Model (DTM) by the Ordnance Survey of Northern Ireland (OSNI). This dataset consists of a grid of regularly spaced points of known height, covering sheet numbers 251-293 at a 10-meter resolution. It is published for OpenData by the Government Digital Service under an Open Government Licence.

Use Cases

• Generate 3D visualizations of the land surface based on the described grid of height points.
• Conduct terrain analysis for hydrological modeling or flood risk assessment using the elevation data.
• Support civil engineering and construction planning with accurate ground surface models.
• Create enhanced base maps by integrating the DTM with other geospatial data like orthophotographs.

Strengths

• Data is provided by the authoritative national mapping agency, Ordnance Survey of Northern Ireland (OSNI).
• The description explicitly defines the data structure as a regular grid of known height points.
• Dataset is published under a permissive Open Government Licence for reuse.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Last update date is unknown; freshness unverified.
• Row count and exact file size are unknown, which may limit suitability assessment.

Provenance

Source

Ordnance Survey of Northern Ireland (OSNI), published via Government Digital Service.

Collection Method

Likely derived from aerial survey or LiDAR data, processed into a regular grid format.

Time Range

null

Freshness

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Geography

Northern Ireland, covering specific sheet areas 251-293.