OSNI Benchmarks: Height Points in Northern Ireland

OSNI Open Data - BenchMarks - Height provides point data showing the location of survey benchmarks and their associated height values in metres above mean sea level. The dataset is published by the Government Digital Service for OpenData under an Open Government Licence. The data is not maintained, and users are advised to use a Global Navigation Satellite System (GNSS) and the latest geoid model for orthometric height in Northern Ireland.

Use Cases

• Validate digital elevation models based on official benchmark height points.
• Perform geospatial analysis of terrain using point-based height data.
• Integrate historical height reference points into modern GNSS workflows.

Strengths

• Data includes precise point locations for height benchmarks.
• Heights are provided in a standardized unit (metres above mean sea level).
• Available in multiple geospatial formats including KML, GeoJSON, and ESRI Shapefile.

Limitations

• The dataset is explicitly noted as not maintained.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Government Digital Service

Collection Method

Likely collected through traditional land surveying methods.

Time Range

null

Freshness

Last update date is unknown; freshness unverified.

Geography

Northern Ireland